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mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_04_14/scripts/execute_action.py

# SPDX-License-Identifier: Apache-2.0 import omni.kit.actions.core action_registry = omni.kit.actions.core.get_action_registry() action = action_registry.get_action("ext_id", "action_id") action.execute()

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_04_14/docs/README.md

# Developer Office Hour - 04/14/2023 This is the sample code from the Developer Office Hour held on 04/14/2023, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - How do I find and execute a Kit Action? - How do I programatically toggle fullscreen mode? - How do I move a prim in the forward direction?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_01_13/scripts/add_script_component.py

# SPDX-License-Identifier: Apache-2.0 import omni.kit.commands from pxr import Sdf import omni.usd # Create the Python Scripting Component property omni.kit.commands.execute('ApplyScriptingAPICommand', paths=[Sdf.Path('/World/Cube')]) omni.kit.commands.execute('RefreshScriptingPropertyWindowCommand') # Add your script to the property stage = omni.usd.get_context().get_stage() prim = stage.GetPrimAtPath("/World/Cube") attr = prim.GetAttribute("omni:scripting:scripts") scripts = attr.Get() # Property with no script paths returns None if scripts is None: scripts = [] else: # Property with scripts paths returns VtArray. # Convert to list to make it easier to work with. scripts = list(scripts) scripts.append(r"C:\Users\mcodesal\Downloads\new_script.py") attr.Set(scripts)

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_01_13/docs/README.md

# Developer Office Hour - 01/13/2023 This is the sample code from the Developer Office Hour held on 01/13/2023, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - 3:46 - How do you programmatically add a Python Script to a prim? (Python Scripting Component) - 8:02 - What are the criteria for valid prim and property names in USD? - 11:14 - How can I swap a prim's material using Action Graph?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_06_23/scripts/select_prims.py

# SPDX-License-Identifier: Apache-2.0 import omni.usd stage = omni.usd.get_context().get_stage() ctx = omni.usd.get_context() selection: omni.usd.Selection = ctx.get_selection() selection.set_selected_prim_paths(["/World/Cube", "/World/Sphere"], False) import omni.kit.commands import omni.usd ctx = omni.usd.get_context() selection: omni.usd.Selection = ctx.get_selection() omni.kit.commands.execute('SelectPrimsCommand', old_selected_paths=selection.get_selected_prim_paths(), new_selected_paths=["/World/Cone"], expand_in_stage=True)

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_06_23/docs/README.md

# Developer Office Hour - 06/23/2023 This is the sample code from the Developer Office Hour held on 06/23/2023, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - 03:50 - How do programmatically select a prim? - 16:00 - How do I reset the settings and preferences for a Kit app?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_01_27/scripts/sub_child_changes.py

# SPDX-License-Identifier: Apache-2.0 # UsdWatcher from pxr import Sdf, Tf, Usd import omni.usd stage = omni.usd.get_context().get_stage() def changed_paths(notice, stage): print("Change fired") for p in notice.GetChangedInfoOnlyPaths(): if str(p).startswith("/World/Parent" + "/"): print("Something happened to a descendent of /World/Parent") print(p) for p in notice.GetResyncedPaths(): if str(p).startswith("/World/Parent" + "/"): print("A descendent of /World/Parent was added or removed") print(p) objects_changed = Tf.Notice.Register(Usd.Notice.ObjectsChanged, changed_paths, None) objects_changed.Revoke()

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_01_27/docs/README.md

# Developer Office Hour - 01/27/2023 This is the sample code from the Developer Office Hour held on 01/27/2023, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - 3:14 - How do I listen for changes to the children of a certain prim? - 15:00 - How do I rotate a prim using Action Graph?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_07_22/maticodes/doh_2022_07_22/extension.py

# SPDX-License-Identifier: Apache-2.0 import omni.ext import omni.ui as ui from omni.kit.widget.searchable_combobox import build_searchable_combo_widget class MyWindow(ui.Window): def __init__(self, title: str = None, delegate=None, **kwargs): super().__init__(title, **kwargs) self.frame.set_build_fn(self._build_window) def _build_window(self): with ui.ScrollingFrame(): with ui.VStack(height=0): ui.Label("My Label") self.proj_scale_model = ui.SimpleFloatModel() self.proj_scale_model_sub = ( self.proj_scale_model.subscribe_value_changed_fn( self.slider_value_changed ) ) ui.FloatSlider(model=self.proj_scale_model, min=0, max=100) def do_rebuild(): self.frame.rebuild() ui.Button("Rebuild", clicked_fn=do_rebuild) def clicked(): # Example showing how to retreive the value from the model. print( f"Button Clicked! Slider Value: {self.proj_scale_model.as_float}" ) self.proj_scale_model.set_value(1.0) ui.Button("Set Slider", clicked_fn=clicked) def on_combo_click_fn(model): component = model.get_value_as_string() print(f"{component} selected") component_list = ["Synthetic Data", "USD", "Kit", "UX", "UX / UI"] component_index = -1 self._component_combo = build_searchable_combo_widget( component_list, component_index, on_combo_click_fn, widget_height=18, default_value="Kit", ) def slider_value_changed(self, model): # Example showing how to get the value when it changes. print("Slider Value:", model.as_float) def destroy(self) -> None: del self.proj_scale_model_sub return super().destroy() class MyExtension(omni.ext.IExt): # ext_id is current extension id. It can be used with extension manager to query additional information, like where # this extension is located on filesystem. def on_startup(self, ext_id): print( "[maticodes.doh_2022_07_22] Dev Office Hours Extension (2022-07-22) startup" ) self._window = MyWindow("MyWindow", width=300, height=300) def on_shutdown(self): print( "[maticodes.doh_2022_07_22] Dev Office Hours Extension (2022-07-22) shutdown" ) if self._window: self._window.destroy() self._window = None

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_07_22/maticodes/doh_2022_07_22/__init__.py

# SPDX-License-Identifier: Apache-2.0 from .extension import *

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_07_22/scripts/cmds_more_params.py

# SPDX-License-Identifier: Apache-2.0 import omni.kit.commands from pxr import Gf, Usd omni.kit.commands.execute('SetAnimCurveKey', paths=['/World/toy_drummer.xformOp:translate'], value=Gf.Vec3d(0.0, 0.0, 18)) omni.kit.commands.execute('SetAnimCurveKey', paths=['/World/toy_drummer.xformOp:translate'], value=Gf.Vec3d(0.0, 0.0, 24), time=Usd.TimeCode(72))

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_07_22/scripts/set_current_time.py

# SPDX-License-Identifier: Apache-2.0 # https://docs.omniverse.nvidia.com/py/kit/source/extensions/omni.timeline/docs/index.html import omni.timeline timeline = omni.timeline.get_timeline_interface() # set in using seconds timeline.set_current_time(1) # set using frame number fps = timeline.get_time_codes_per_seconds() timeline.set_current_time(48 / fps)

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_07_22/scripts/reference_usdz.py

# SPDX-License-Identifier: Apache-2.0 import omni.kit.commands from pxr import Sdf import omni.usd omni.kit.commands.execute('CreateReference', path_to=Sdf.Path('/World/toy_drummer2'), asset_path='C:/Users/mcodesal/Downloads/toy_drummer.usdz', usd_context=omni.usd.get_context())

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_07_22/scripts/run_action_graph.py

# SPDX-License-Identifier: Apache-2.0 # https://docs.omniverse.nvidia.com/py/kit/source/extensions/omni.graph/docs/index.html import omni.graph.core as og keys = og.Controller.Keys og.Controller.edit("/World/ActionGraph", { keys.SET_VALUES: ("/World/ActionGraph/on_impulse_event.state:enableImpulse", True) })

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_07_22/docs/README.md

# Developer Office Hour - 07/22/2022 This is the sample code from the Developer Office Hour held on 07/22/2022, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - How do I reference a USDZ file? - How do I look up all of the parameters for a Kit Command? - How do I set the current frame using Python? - How do I execute an Action Graph using Python? - How do I align radio buttons horizontally? - How do I refresh a UI window? - How do I customize the appearance of a slider?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_10_14/maticodes/doh_2022_10_14/extension.py

# SPDX-License-Identifier: Apache-2.0 import carb import omni.ext import omni.ui as ui class MyWindow(ui.Window): def __init__(self, title: str = None, **kwargs): super().__init__(title, **kwargs) self.frame.set_build_fn(self._build_window) def _build_window(self): def hello(): print("Hello") ui.Button("Click Me", clicked_fn=hello) class MyExtension(omni.ext.IExt): def on_startup(self, ext_id): carb.log_info("[maticodes.doh_2022_10_14] Dev Office Hours Extension (2022-10-14) startup") self._window = MyWindow("MyWindow", width=300, height=300) def on_shutdown(self): carb.log_info("[maticodes.doh_2022_10_14] Dev Office Hours Extension (2022-10-14) shutdown") if self._window: self._window.destroy() self._window = None

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_10_14/scripts/context_menu_inject.py

# SPDX-License-Identifier: Apache-2.0 import omni.kit.context_menu def show_menu(objects): print("show it?") return True def hello_world(objects): print(f"Hello Objects: {objects}") menu_item_config = { "name": "Hello World!", "glyph": "menu_search.svg", "show_fn": [show_menu], "onclick_fn": hello_world, } # You must keep a reference to the menu item. Set this variable to None to remove the item from the menu hello_world_menu_item = omni.kit.context_menu.add_menu(menu_item_config, "MENU", "omni.kit.window.viewport") hello_world_menu_item = None

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_10_14/docs/README.md

# Developer Office Hour - 10/14/2022 This is the sample code from the Developer Office Hour held on 10/14/2022, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - Why doesn't OV Code start? - How do I inject my custom menu item into an existing context menu?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_08_25/scripts/add_sbsar.py

# SPDX-License-Identifier: Apache-2.0 import omni.kit.commands omni.kit.commands.execute('AddSbsarReferenceAndBindCommand', sbsar_path=r"C:\Users\mcodesal\Downloads\blueberry_skin.sbsar", target_prim_path="/World/Sphere")

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_08_25/scripts/get_selected_meshes.py

# SPDX-License-Identifier: Apache-2.0 import omni.usd from pxr import Usd, UsdGeom stage = omni.usd.get_context().get_stage() selection = omni.usd.get_context().get_selection().get_selected_prim_paths() meshes = [] for path in selection: prim = stage.GetPrimAtPath(path) if prim.IsA(UsdGeom.Mesh): meshes.append(prim) print("Selected meshes:") print(meshes)

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_08_25/docs/README.md

# Developer Office Hour - 08/25/2023 This is the sample code from the Developer Office Hour held on 08/25/2023, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - 02:17 - How do I get just the mesh prims from my current selection? - 08:26 - How do I programmatically add an SBSAR material to my USD Stage?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_04_28/scripts/toggle_hud.py

# SPDX-License-Identifier: Apache-2.0 import omni.kit.viewport.utility as okvu okvu.toggle_global_visibility()

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_04_28/scripts/custom_attrs.py

# SPDX-License-Identifier: Apache-2.0 # Docs: https://docs.omniverse.nvidia.com/prod_kit/prod_kit/programmer_ref/usd/properties/create-attribute.html import omni.usd from pxr import Usd, Sdf stage = omni.usd.get_context().get_stage() prim: Usd.Prim = stage.GetPrimAtPath("/World/Cylinder") attr: Usd.Attribute = prim.CreateAttribute("mySecondAttr", Sdf.ValueTypeNames.Bool) attr.Set(False)

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_04_28/scripts/custom_global_data.py

# SPDX-License-Identifier: Apache-2.0 import omni.usd stage = omni.usd.get_context().get_stage() layer = stage.GetRootLayer() print(type(layer)) layer.SetCustomLayerData({"Hello": "World"}) stage.DefinePrim("/World/Hello", "HelloWorld") stage.DefinePrim("/World/MyTypeless")

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_04_28/scripts/make_unselectable.py

# SPDX-License-Identifier: Apache-2.0 # Docs: https://docs.omniverse.nvidia.com/kit/docs/omni.usd/latest/omni.usd/omni.usd.UsdContext.html#omni.usd.UsdContext.set_pickable import omni.usd ctx = omni.usd.get_context() ctx.set_pickable("/", True)

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_04_28/scripts/change_viewport_camera.py

# SPDX-License-Identifier: Apache-2.0 import omni.kit.viewport.utility as vu from pxr import Sdf vp_api = vu.get_active_viewport() vp_api.camera_path = "/World/Camera_01"

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_04_28/docs/README.md

# Developer Office Hour - 04/28/2023 This is the sample code from the Developer Office Hour held on 04/28/2023, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - 02:18 - How do I make a prim unselectable in the viewport? - 07:50 - How do I create custom properties? - 26:00 - Can I write custom components for prims link in Unity? - 50:21 - How can I toggle the stats heads up display on the viewport? - 66:00 - How can you switch cameras on the active viewport?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_09_01/scripts/logging.py

# SPDX-License-Identifier: Apache-2.0 import logging import carb logger = logging.getLogger() print("Hello") carb.log_info("World") logger.info("Omniverse")

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_09_01/scripts/xforming.py

# SPDX-License-Identifier: Apache-2.0 from pxr import UsdGeom import omni.usd stage = omni.usd.get_context().get_stage() cube = stage.GetPrimAtPath("/World/Xform/Cube") cube_xformable = UsdGeom.Xformable(cube) transform = cube_xformable.GetLocalTransformation() print(transform) transform2 = cube_xformable.GetLocalTransformation() print(transform2)

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_09_01/docs/README.md

# Developer Office Hour - 09/01/2023 This is the sample code from the Developer Office Hour held on 09/01/2023, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - 7:27 - How do I validate my assets to make sure they are up-to-date with the latest USD specification?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_10_28/scripts/usd_watcher.py

# SPDX-License-Identifier: Apache-2.0 import omni.usd from pxr import Gf stage = omni.usd.get_context().get_stage() cube = stage.GetPrimAtPath("/World/Cube") def print_size(changed_path): print("Size Changed:", changed_path) def print_pos(changed_path): print(changed_path) if changed_path.IsPrimPath(): prim_path = changed_path else: prim_path = changed_path.GetPrimPath() prim = stage.GetPrimAtPath(prim_path) local_transform = omni.usd.get_local_transform_SRT(prim) print("Translation: ", local_transform[3]) def print_world_pos(changed_path): world_transform: Gf.Matrix4d = omni.usd.get_world_transform_matrix(prim) translation: Gf.Vec3d = world_transform.ExtractTranslation() print(translation) size_attr = cube.GetAttribute("size") cube_sub = omni.usd.get_watcher().subscribe_to_change_info_path(cube.GetPath(), print_world_pos) cube_size_sub = omni.usd.get_watcher().subscribe_to_change_info_path(size_attr.GetPath(), print_size) cube_sub = None cube_size_sub = None

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_10_28/scripts/extras.py

# SPDX-License-Identifier: Apache-2.0 import omni.usd stage = omni.usd.get_context().get_stage() prim = stage.GetPrimAtPath("/World/Cube") if prim: print("Prim Exists") from pxr import UsdGeom # e.g., find all prims of type UsdGeom.Mesh mesh_prims = [x for x in stage.Traverse() if x.IsA(UsdGeom.Mesh)] mesh_prims = [] for x in stage.Traverse(): if x.IsA(UsdGeom.Mesh): mesh_prims.append(x) print(mesh_prims)

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_10_28/scripts/docking.py

# SPDX-License-Identifier: Apache-2.0 import omni.ui as ui my_window = ui.Window("Example Window", width=300, height=300) with my_window.frame: with ui.VStack(): f = ui.FloatField() def clicked(f=f): print("clicked") f.model.set_value(f.model.get_value_as_float() + 1) ui.Button("Plus One", clicked_fn=clicked) my_window.dock_in_window("Property", ui.DockPosition.SAME) ui.dock_window_in_window(my_window.title, "Property", ui.DockPosition.RIGHT, 0.2) my_window.deferred_dock_in("Content", ui.DockPolicy.TARGET_WINDOW_IS_ACTIVE)

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_10_28/docs/README.md

# Developer Office Hour - 10/28/2022 This is the sample code from the Developer Office Hour held on 10/28/2022, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - How do I dock my window? - How do I subscribe to changes to a prim or attribute? (omni.usd.get_watcher())

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_09_23/scripts/combobox_selected_item.py

# SPDX-License-Identifier: Apache-2.0 import omni.ui as ui my_window = ui.Window("Example Window", width=300, height=300) combo_sub = None options = ["One", "Two", "Three"] with my_window.frame: with ui.VStack(): combo_model: ui.AbstractItemModel = ui.ComboBox(0, *options).model def combo_changed(item_model: ui.AbstractItemModel, item: ui.AbstractItem): value_model = item_model.get_item_value_model(item) current_index = value_model.as_int option = options[current_index] print(f"Selected '{option}' at index {current_index}.") combo_sub = combo_model.subscribe_item_changed_fn(combo_changed) def clicked(): value_model = combo_model.get_item_value_model() current_index = value_model.as_int option = options[current_index] print(f"Button Clicked! Selected '{option}' at index {current_index}.") ui.Button("Print Combo Selection", clicked_fn=clicked)

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_09_23/scripts/use_tokens.py

# SPDX-License-Identifier: Apache-2.0 # https://docs.omniverse.nvidia.com/py/kit/docs/guide/tokens.html import carb.tokens from pathlib import Path path = Path("${shared_documents}") / "maticodes.foo" resolved_path = carb.tokens.get_tokens_interface().resolve(str(path)) print(resolved_path)

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_09_23/scripts/simple_instancer.py

# SPDX-License-Identifier: Apache-2.0 import omni.usd from pxr import Usd, UsdGeom, Sdf, Gf stage: Usd.Stage = omni.usd.get_context().get_stage() prim_path = Sdf.Path("/World/MyInstancer") instancer: UsdGeom.PointInstancer = UsdGeom.PointInstancer.Define(stage, prim_path) proto_container = UsdGeom.Scope.Define(stage, prim_path.AppendPath("Prototypes")) shapes = [] shapes.append(UsdGeom.Cube.Define(stage, proto_container.GetPath().AppendPath("Cube"))) shapes.append(UsdGeom.Sphere.Define(stage, proto_container.GetPath().AppendPath("Sphere"))) shapes.append(UsdGeom.Cone.Define(stage, proto_container.GetPath().AppendPath("Cone"))) instancer.CreatePositionsAttr([Gf.Vec3f(0, 0, 0), Gf.Vec3f(2, 0, 0), Gf.Vec3f(4, 0, 0)]) instancer.CreatePrototypesRel().SetTargets([shape.GetPath() for shape in shapes]) instancer.CreateProtoIndicesAttr([0, 1, 2])

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_09_23/scripts/one_widget_in_container.py

# SPDX-License-Identifier: Apache-2.0 import omni.ui as ui my_window = ui.Window("Example Window", width=300, height=300) with my_window.frame: with ui.VStack(): with ui.CollapsableFrame(): with ui.VStack(): ui.FloatField() ui.FloatField() ui.Button("Button 1")

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_09_23/docs/README.md

# Developer Office Hour - 09/23/2022 This is the sample code from the Developer Office Hour held on 09/23/2022, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - How do I query the selected item in a ui.ComboBox? - How do I use Kit tokens? - Why do I only see one widget in my UI container?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_09_09/maticodes/doh_2022_09_09/extension.py

# SPDX-License-Identifier: Apache-2.0 import carb import omni.ext import omni.kit.commands import omni.ui as ui import omni.usd from pxr import Gf, Sdf # Check out: USDColorModel # C:\ext_projects\omni-dev-office-hours\app\kit\exts\omni.example.ui\omni\example\ui\scripts\colorwidget_doc.py class MyWindow(ui.Window): def __init__(self, title: str = None, **kwargs): super().__init__(title, **kwargs) self._color_model = None self._color_changed_subs = [] self._path_model = None self._change_info_path_subscription = None self._path_changed_sub = None self._stage = omni.usd.get_context().get_stage() self.frame.set_build_fn(self._build_window) def _build_window(self): with ui.ScrollingFrame(): with ui.VStack(height=0): ui.Label("Property Path") self._path_model = ui.StringField().model self._path_changed_sub = self._path_model.subscribe_value_changed_fn( self._on_path_changed ) ui.Label("Color") with ui.HStack(spacing=5): self._color_model = ui.ColorWidget(width=0, height=0).model for item in self._color_model.get_item_children(): component = self._color_model.get_item_value_model(item) self._color_changed_subs.append(component.subscribe_value_changed_fn(self._on_color_changed)) ui.FloatField(component) def _on_mtl_attr_changed(self, path): color_attr = self._stage.GetAttributeAtPath(path) color_model_items = self._color_model.get_item_children() if color_attr: color = color_attr.Get() for i in range(len(color)): component = self._color_model.get_item_value_model(color_model_items[i]) component.set_value(color[i]) def _on_path_changed(self, model): if Sdf.Path.IsValidPathString(model.as_string): attr_path = Sdf.Path(model.as_string) color_attr = self._stage.GetAttributeAtPath(attr_path) if color_attr: self._change_info_path_subscription = omni.usd.get_watcher().subscribe_to_change_info_path( attr_path, self._on_mtl_attr_changed ) def _on_color_changed(self, model): values = [] for item in self._color_model.get_item_children(): component = self._color_model.get_item_value_model(item) values.append(component.as_float) if Sdf.Path.IsValidPathString(self._path_model.as_string): attr_path = Sdf.Path(self._path_model.as_string) color_attr = self._stage.GetAttributeAtPath(attr_path) if color_attr: color_attr.Set(Gf.Vec3f(*values[0:3])) def destroy(self) -> None: self._change_info_path_subscription = None self._color_changed_subs = None self._path_changed_sub = None return super().destroy() class MyExtension(omni.ext.IExt): def on_startup(self, ext_id): carb.log_info("[maticodes.doh_2022_09_09] Dev Office Hours Extension (2022-09-09) startup") self._window = MyWindow("MyWindow", width=300, height=300) def on_shutdown(self): carb.log_info("[maticodes.doh_2022_09_09] Dev Office Hours Extension (2022-09-09) shutdown") if self._window: self._window.destroy() self._window = None

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_09_09/scripts/undo_group.py

# SPDX-License-Identifier: Apache-2.0 import omni.kit.commands import omni.kit.undo # Requires Ctrl+Z twice to undo omni.kit.commands.execute('CreateMeshPrimWithDefaultXform', prim_type='Cube') omni.kit.commands.execute('CreateMeshPrimWithDefaultXform', prim_type='Cube') # Grouped into one undo with omni.kit.undo.group(): omni.kit.commands.execute('CreateMeshPrimWithDefaultXform', prim_type='Cube') omni.kit.commands.execute('CreateMeshPrimWithDefaultXform', prim_type='Cube')

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_09_09/scripts/skip_undo_history.py

# SPDX-License-Identifier: Apache-2.0 import omni.kit.commands import omni.kit.primitive.mesh as mesh_cmds # Creates history omni.kit.commands.execute('CreateMeshPrimWithDefaultXform', prim_type='Cube') # Doesn't create history mesh_cmds.CreateMeshPrimWithDefaultXformCommand("Cube").do()

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_09_09/docs/README.md

# Developer Office Hour - 09/09/2022 This is the sample code from the Developer Office Hour held on 09/09/2022, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - How do I connect a ColorWidget to the base color of a material at a specific path? - How do I create an undo group? - How do I avoid adding a command to the undo history?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_08_18/maticodes/doh_2023_08_18/extension.py

# SPDX-License-Identifier: Apache-2.0 import asyncio from pathlib import Path import carb import omni.ext import omni.ui as ui import omni.usd test_stage_path = Path(__file__).parent.parent.parent / "data" / "test_stage.usd" class MyWindow(ui.Window): def __init__(self, title: str = None, **kwargs): super().__init__(title, **kwargs) self.frame.set_build_fn(self._build_window) def _build_window(self): with ui.ScrollingFrame(): with ui.VStack(height=0): ui.Label("My Label") def clicked(): carb.log_info(test_stage_path) # Synch option # omni.usd.get_context().open_stage(str(test_stage_path)) # Async Option # asyncio.ensure_future(self.open_stage()) # Async with Callback omni.usd.get_context().open_stage_with_callback(str(test_stage_path), self.on_stage_open_finished) ui.Button("Click Me", clicked_fn=clicked) async def open_stage(self): (result, error) = await omni.usd.get_context().open_stage_async(str(test_stage_path)) #Now that we've waited for the scene to open, we should be able to get the stage stage = omni.usd.get_context().get_stage() print (f"opened stage {stage} with result {result}") def on_stage_open_finished(self, result: bool, path: str): stage = omni.usd.get_context().get_stage() print (f"opened stage {stage} with result {result}") class MyExtension(omni.ext.IExt): def on_startup(self, ext_id): carb.log_info("[maticodes.doh_2023_08_18] Dev Office Hours Extension (2023-08-18) startup") self._window = MyWindow("MyWindow", width=300, height=300) def on_shutdown(self): carb.log_info("[maticodes.doh_2023_08_18] Dev Office Hours Extension (2023-08-18) shutdown") if self._window: self._window.destroy() self._window = None

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_08_18/docs/README.md

# Developer Office Hour - 08/18/2023 This is the sample code from the Developer Office Hour held on 08/18/2023, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - 02:16 - How do I programmatically open a Stage in Kit?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_08_26/maticodes/doh_2022_08_26/extension.py

# SPDX-License-Identifier: Apache-2.0 import carb import omni.ext class MyExtension(omni.ext.IExt): def on_startup(self, ext_id): carb.log_info("[maticodes.doh_2022_08_26] Dev Office Hours Extension (2022-08-26) startup") def on_shutdown(self): carb.log_info("[maticodes.doh_2022_08_26] Dev Office Hours Extension (2022-08-26) shutdown")

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_08_26/maticodes/doh_2022_08_26/math.py

# SPDX-License-Identifier: Apache-2.0 def add(a, b): return a + b

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_08_26/scripts/get_world_pos.py

# SPDX-License-Identifier: Apache-2.0 import omni.usd from pxr import Usd, Gf stage = omni.usd.get_context().get_stage() prim = stage.GetPrimAtPath("/World/Xform/Cube") matrix:Gf.Matrix4d = omni.usd.get_world_transform_matrix(prim, time_code=Usd.TimeCode.Default()) translation = matrix.ExtractTranslation() print(translation)

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_08_26/scripts/mouse_cursor_shape.py

# SPDX-License-Identifier: Apache-2.0 #################################### # MUST ENABLE omni.kit.window.cursor #################################### import carb import omni.kit.window.cursor cursor = omni.kit.window.cursor.get_main_window_cursor() # OPTIONS: # carb.windowing.CursorStandardShape.ARROW # carb.windowing.CursorStandardShape.IBEAM # carb.windowing.CursorStandardShape.VERTICAL_RESIZE # carb.windowing.CursorStandardShape.HORIZONTAL_RESIZE # carb.windowing.CursorStandardShape.HAND # carb.windowing.CursorStandardShape.CROSSHAIR cursor.override_cursor_shape(carb.windowing.CursorStandardShape.CROSSHAIR) # clear back to arrow cursor.clear_overridden_cursor_shape()

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_08_26/scripts/refresh_combobox.py

# SPDX-License-Identifier: Apache-2.0 import omni.ui as ui def next_num(n): while True: yield n n += 1 my_window = ui.Window("Example Window", width=300, height=300) item_changed_sub = None with my_window.frame: with ui.VStack(): combo = ui.ComboBox(0, "Option1", "Option2", "Option3") # I'm just using this to generate unique data nums = next_num(0) def clicked(): # clear the list items = combo.model.get_item_children() for item in items: combo.model.remove_item(item) # generate a new list for x in range(5): combo.model.append_child_item(None, ui.SimpleIntModel(next(nums))) ui.Button("Regenerate Combo", clicked_fn=clicked)

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_08_26/scripts/focus_prim.py

# SPDX-License-Identifier: Apache-2.0 ####################################### # MUST ENABLE omni.kit.viewport.utility ####################################### from omni.kit.viewport.utility import get_active_viewport, frame_viewport_selection import omni.usd # Select what you want to focus on selection = omni.usd.get_selection() selection.set_selected_prim_paths(["/World/Cube"], True) # focus on selection active_viewport = get_active_viewport() if active_viewport: frame_viewport_selection(active_viewport)

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_08_26/scripts/corner_rounding.py

# SPDX-License-Identifier: Apache-2.0 import omni.ui as ui my_window = ui.Window("Example Window", width=300, height=300) with my_window.frame: with ui.VStack(): ui.Rectangle(style={ "background_color": ui.color(1.0, 0.0, 0.0), "border_radius":20.0 }) ui.Rectangle(style={ "background_color": ui.color(0.0, 1.0, 0.0), "border_radius":20.0, "corner_flag": ui.CornerFlag.BOTTOM }) ui.Rectangle(style={ "background_color": ui.color(0.0, 0.0, 1.0), "border_radius":20.0, "corner_flag": ui.CornerFlag.TOP }) ui.Rectangle(style={ "background_color": ui.color(1.0, 0.0, 1.0), "border_radius":20.0, "corner_flag": ui.CornerFlag.TOP_RIGHT })

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_08_26/docs/README.md

# Developer Office Hour - 08/26/2022 This is the sample code from the Developer Office Hour held on 08/26/2022, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - How do I execute arbitrary code from VSCode in Omniverse? - How do I create omni.ui.Rectangle with only top or bottom rounded corners? - How do I update a list of items in a ui.ComboBox without rebuilding the widget? - How do I change the shape of the mouse cursor? - How do I get the world position of a prim? - What are the conventions for naming extensions? - How do I add a custom window in the Window menu? - How do I share Python code between extensions?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_05_26/scripts/get_references.py

# SPDX-License-Identifier: Apache-2.0 import omni.usd stage = omni.usd.get_context().get_stage() prim = stage.GetPrimAtPath("/World/Xform") refs = prim.GetMetadata("references").ApplyOperations([]) for ref in refs: print(ref.primPath) print(ref.assetPath)

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_05_26/docs/README.md

# Developer Office Hour - 05/26/2023 This is the sample code from the Developer Office Hour held on 05/26/2023, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - 02:29 - How do I get an Omniverse app to pick up a new environment variable?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_04_07/scripts/current_frame_number.py

# SPDX-License-Identifier: Apache-2.0 import carb import omni.timeline itimeline = omni.timeline.get_timeline_interface() current_seconds = itimeline.get_current_time() fps = itimeline.get_time_codes_per_seconds() current_frame = current_seconds * fps print(f"Current Frame: {current_frame}")

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_04_07/scripts/get_local_transform.py

# SPDX-License-Identifier: Apache-2.0 from pxr import Gf, UsdGeom, Usd import omni.usd def decompose_matrix(mat: Gf.Matrix4d): reversed_ident_mtx = reversed(Gf.Matrix3d()) translate = mat.ExtractTranslation() scale = Gf.Vec3d(*(v.GetLength() for v in mat.ExtractRotationMatrix())) #must remove scaling from mtx before calculating rotations mat.Orthonormalize() #without reversed this seems to return angles in ZYX order rotate = Gf.Vec3d(*reversed(mat.ExtractRotation().Decompose(*reversed_ident_mtx))) return translate, rotate, scale stage = omni.usd.get_context().get_stage() prim = stage.GetPrimAtPath("/World/Cube") xform = UsdGeom.Xformable(prim) local_transformation: Gf.Matrix4d = xform.GetLocalTransformation() print(decompose_matrix(local_transformation)) def get_local_rot(prim: Usd.Prim): return prim.GetAttribute("xformOp:rotateXYZ").Get() print(get_local_rot(prim))

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_04_07/scripts/sceneui_behavior.py

# SPDX-License-Identifier: Apache-2.0 from omni.kit.viewport.utility import get_active_viewport_window import omni.ui as ui from omni.kit.scripting import BehaviorScript from omni.ui import scene as sc from omni.ui import color as cl class NewScript(BehaviorScript): def on_init(self): print(f"{__class__.__name__}.on_init()->{self.prim_path}") self.viewport_window = get_active_viewport_window() self.frame = self.viewport_window.get_frame("Super Duper Cool!") def on_destroy(self): print(f"{__class__.__name__}.on_destroy()->{self.prim_path}") def test(self): print("Hello") def on_play(self): print(f"{__class__.__name__}.on_play()->{self.prim_path}") with self.frame: # Create a default SceneView (it has a default camera-model) self._scene_view = sc.SceneView() # Add the manipulator into the SceneView's scene with self._scene_view.scene: sc.Rectangle(5, 5, thickness=2, wireframe=False, color=cl.red) # Register the SceneView with the Viewport to get projection and view updates self.viewport_window.viewport_api.add_scene_view(self._scene_view) def on_pause(self): print(f"{__class__.__name__}.on_pause()->{self.prim_path}") def on_stop(self): print(f"{__class__.__name__}.on_stop()->{self.prim_path}") if self._scene_view: # Empty the SceneView of any elements it may have self._scene_view.scene.clear() # Be a good citizen, and un-register the SceneView from Viewport updates if self.viewport_window: self.viewport_window.viewport_api.remove_scene_view(self._scene_view) # Remove our references to these objects self._scene_view = None self.frame.destroy() def on_update(self, current_time: float, delta_time: float): # print(f"{__class__.__name__}.on_update(current_time={current_time}, delta_time={delta_time})->{self.prim_path}") pass

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_04_07/docs/README.md

# Developer Office Hour - 04/07/2023 This is the sample code from the Developer Office Hour held on 04/07/2023, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - Where can I find extension API documentation? - How do I get the current frame number?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_05_05/scripts/omnilive.py

# SPDX-License-Identifier: Apache-2.0 from omni.kit.usd.layers import get_live_syncing import omni.client import asyncio UNIQUE_SESSION_NAME = "my_unique_session" # Get the interface live_syncing = get_live_syncing() # Create a session live_session = live_syncing.create_live_session(UNIQUE_SESSION_NAME) # Simulate joining a session for session in live_syncing.get_all_live_sessions(): if session.name == UNIQUE_SESSION_NAME: live_syncing.join_live_session(session) break # Merge changes into base layer and disconnect from live session loop = asyncio.get_event_loop() loop.create_task(live_syncing.merge_and_stop_live_session_async(layer_identifier=session.base_layer_identifier)) # Disconnect from live session without merging. When you reconnect, changes will still be in your live session. live_syncing.stop_live_session(session.base_layer_identifier) # Delete the session once you're all done. You can add a callback for the second arg to know if completed. omni.client.delete_with_callback(session.url, lambda: None)

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_05_05/scripts/change_renderer.py

# SPDX-License-Identifier: Apache-2.0 # RTX Path Tracing import omni.kit.actions.core action_registry = omni.kit.actions.core.get_action_registry() action = action_registry.get_action("omni.kit.viewport.actions", "set_renderer_rtx_pathtracing") action.execute() # RTX Real-Time import omni.kit.actions.core action_registry = omni.kit.actions.core.get_action_registry() action = action_registry.get_action("omni.kit.viewport.actions", "set_renderer_rtx_realtime") action.execute() # Storm import omni.kit.actions.core action_registry = omni.kit.actions.core.get_action_registry() action = action_registry.get_action("omni.kit.viewport.actions", "set_renderer_pxr_storm") action.execute() # Iray import omni.kit.actions.core action_registry = omni.kit.actions.core.get_action_registry() action = action_registry.get_action("omni.kit.viewport.actions", "set_renderer_iray") action.execute()

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_05_05/scripts/change_variants.py

# SPDX-License-Identifier: Apache-2.0 from pxr import Usd, UsdGeom import omni.usd stage = omni.usd.get_context().get_stage() world_prim = stage.GetPrimAtPath("/World") vset = world_prim.GetVariantSets().AddVariantSet('shapes') vset.AddVariant('cube') vset.AddVariant('sphere') vset.AddVariant('cone') vset.SetVariantSelection('cube') with vset.GetVariantEditContext(): UsdGeom.Cube.Define(stage, "/World/Cube") vset.SetVariantSelection('sphere') with vset.GetVariantEditContext(): UsdGeom.Sphere.Define(stage, "/World/Sphere") vset.SetVariantSelection('cone') with vset.GetVariantEditContext(): UsdGeom.Cone.Define(stage, "/World/Cone") stage = omni.usd.get_context().get_stage() world_prim = stage.GetPrimAtPath("/World") vsets = world_prim.GetVariantSets() vset = vsets.GetVariantSet("shapes") vset.SetVariantSelection("cone")

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_05_05/docs/README.md

# Developer Office Hour - 05/05/2023 This is the sample code from the Developer Office Hour held on 05/05/2023, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - 02:05 - How can I programmatically create and join an OmniLive session? - 14:17 - How can I programmatically change the renderer to RTX Real-Time, RTX Path Tracing, Iray, or Storm?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_12_09/scripts/screenshot_viewport.py

# SPDX-License-Identifier: Apache-2.0 from omni.kit.viewport.utility import get_active_viewport, capture_viewport_to_file vp_api = get_active_viewport() capture_viewport_to_file(vp_api, r"C:\temp\screenshot.png")

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_12_09/scripts/collect_asset.py

# SPDX-License-Identifier: Apache-2.0 import asyncio from omni.kit.tool.collect.collector import Collector async def collect_async(input_usd, output_dir, usd_only, flat_collection, mtl_only, prog_cb, finish_cb): """Collect input_usd related assets to output_dir. Args: input_usd (str): The usd stage to be collected. output_dir (str): The target dir to collect the usd stage to. usd_only (bool): Collects usd files only or not. It will ignore all asset types. flat_collection (bool): Collects stage without keeping the original dir structure. mtl_only (bool): Collects material and textures only or not. It will ignore all other asset types. prog_cb: Progress callback function finish_cb: Finish callback function """ collector = Collector(input_usd, output_dir, usd_only, flat_collection, mtl_only) await collector.collect(prog_cb, finish_cb) def finished(): print("Finished!") asyncio.ensure_future(collect_async(r"C:\temp\bookcase.usd", r"C:\temp\test_collect", False, False, False, None, finished))

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_12_09/docs/README.md

# Developer Office Hour - 12/09/2022 This is the sample code from the Developer Office Hour held on 12/09/2022, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - How do I Collect Asset using Python to share a full Omniverse project? - How do I capture a screenshot of the viewport? - How do I change the visibility of a prim using Action Graph?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_03_31/scripts/viewport_ui.py

# SPDX-License-Identifier: Apache-2.0 from omni.kit.scripting import BehaviorScript from omni.kit.viewport.utility import get_active_viewport_window import omni.ui as ui class ViewportUi(BehaviorScript): def on_init(self): # print(f"{__class__.__name__}.on_init()->{self.prim_path}") self.frame = None def on_destroy(self): print(f"{__class__.__name__}.on_destroy()->{self.prim_path}") if self.frame is not None: self.frame.destroy() self.frame = None def test(self): print("Hello World!") def on_play(self): print(f"{__class__.__name__}.on_play()->{self.prim_path}") self.viewport_window = get_active_viewport_window() self.frame = self.viewport_window.get_frame("Really cool id") with self.frame: with ui.Placer(offset_x=10, offset_y=50): with ui.HStack(): ui.Button("Test", width=50, height=50, clicked_fn=self.test) def on_pause(self): print(f"{__class__.__name__}.on_pause()->{self.prim_path}") def on_stop(self): print(f"{__class__.__name__}.on_stop()->{self.prim_path}") if self.frame is not None: self.frame.destroy() self.frame = None def on_update(self, current_time: float, delta_time: float): # print(f"{__class__.__name__}.on_update(current_time={current_time}, delta_time={delta_time})->{self.prim_path}") pass

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_03_31/docs/README.md

# Developer Office Hour - 03/31/2023 This is the sample code from the Developer Office Hour held on 03/31/2023, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - How do I add UI widgets to the viewport in a BehaviorScript (Python Scripting Component)? - How do I add extension dependencies to my custom extension?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_12_16/scripts/script_node.py

# SPDX-License-Identifier: Apache-2.0 # This script is executed the first time the script node computes, or the next time it computes after this script # is modified or the 'Reset' button is pressed. # The following callback functions may be defined in this script: # setup(db): Called immediately after this script is executed # compute(db): Called every time the node computes (should always be defined) # cleanup(db): Called when the node is deleted or the reset button is pressed (if setup(db) was called before) # Defining setup(db) and cleanup(db) is optional, but if compute(db) is not defined then this script node will run # in legacy mode, where the entire script is executed on every compute and the callback functions above are ignored. # Available variables: # db: og.Database The node interface, attributes are db.inputs.data, db.outputs.data. # Use db.log_error, db.log_warning to report problems. # Note that this is available outside of the callbacks only to support legacy mode. # og: The OmniGraph module # Import statements, function/class definitions, and global variables may be placed outside of the callbacks. # Variables may also be added to the db.internal_state state object. # Example code snippet: import math UNITS = "cm" def calculate_circumfrence(radius): return 2 * math.pi * radius def setup(db): state = db.internal_state state.radius = 1 def compute(db): state = db.internal_state circumfrence = calculate_circumfrence(state.radius) print(f"{circumfrence} {UNITS}") print(f"My Input: {db.inputs.my_input}") db.outputs.foo = False state.radius += 1 # To see more examples, click on the Code Snippets button below.

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_12_16/scripts/file_import.py

# SPDX-License-Identifier: Apache-2.0 # https://docs.omniverse.nvidia.com/kit/docs/omni.kit.window.file_importer/latest/Overview.html from omni.kit.window.file_importer import get_file_importer from typing import List file_importer = get_file_importer() def import_handler(filename: str, dirname: str, selections: List[str] = []): # NOTE: Get user inputs from self._import_options, if needed. print(f"> Import '{filename}' from '{dirname}' or selected files '{selections}'") file_importer.show_window( title="Import File", import_handler=import_handler )

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_12_16/scripts/file_exporter.py

# SPDX-License-Identifier: Apache-2.0 # https://docs.omniverse.nvidia.com/kit/docs/omni.kit.window.file_exporter/latest/index.html from omni.kit.window.file_exporter import get_file_exporter from typing import List file_exporter = get_file_exporter() def export_handler(filename: str, dirname: str, extension: str = "", selections: List[str] = []): # NOTE: Get user inputs from self._export_options, if needed. print(f"> Export As '{filename}{extension}' to '{dirname}' with additional selections '{selections}'") file_exporter.show_window( title="Export As ...", export_button_label="Save", export_handler=export_handler, )

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_12_16/docs/README.md

# Developer Office Hour - 12/16/2022 This is the sample code from the Developer Office Hour held on 12/16/2022, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - Where are the API docs for extensions? - How do I browse for a file for import? - How do I browse for a file for export? - How do I use the Script Node? (using compute function)

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_09_08/scripts/sub_event.py

# SPDX-License-Identifier: Apache-2.0 # App/Subscribe to Update Events import carb.events import omni.kit.app update_stream = omni.kit.app.get_app().get_update_event_stream() def on_update(e: carb.events.IEvent): print(f"Update: {e.payload['dt']}") sub = update_stream.create_subscription_to_pop(on_update, name="My Subscription Name") # Remember to cleanup your subscription when you're done with them (e.g. during shutdown) # sub = None

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_09_08/scripts/trigger_every_N.py

# App/Subscribe to Update Events import carb.events import omni.kit.app import omni.timeline update_stream = omni.kit.app.get_app().get_update_event_stream() every_N = 5 # seconds elapsed = 0 update_sub = None def on_update(e: carb.events.IEvent): global elapsed elapsed += e.payload["dt"] if elapsed >= every_N: print(f"{every_N} seconds have passed. Fire!") elapsed = 0 # print(f"Update: {elapsed}") def on_play(e: carb.events.IEvent): global update_sub update_sub = update_stream.create_subscription_to_pop(on_update, name="My Subscription Name") def on_stop(e: carb.events.IEvent): global update_sub update_sub = None itimeline: omni.timeline.ITimeline = omni.timeline.get_timeline_interface() play_sub = itimeline.get_timeline_event_stream().create_subscription_to_pop_by_type(omni.timeline.TimelineEventType.PLAY, on_play) stop_sub = itimeline.get_timeline_event_stream().create_subscription_to_pop_by_type(omni.timeline.TimelineEventType.STOP, on_stop) # Remember to unsub by setting variables to None. update_sub = None play_sub = None stop_sub = None

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_09_08/docs/README.md

# Developer Office Hour - 09/08/2023 This is the sample code from the Developer Office Hour held on 09/08/2023, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - 2:22 - How do I listen for or subscribe to an event in Omniverse Kit? - 15:14 - How do I run a function every N seconds during playback? - 44:00 - How do I link to a DLL with an extension?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_10_21/docs/README.md

# Developer Office Hour - 10/21/2022 This is the sample code from the Developer Office Hour held on 10/21/2022, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions 1. Where are Omniverse logs located? 2. Where is the data directory for an Omniverse app? 3. What is link_app.bat? 4. How do I get intellisense working in VS Code?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_09_30/scripts/curve_widths.py

# SPDX-License-Identifier: Apache-2.0 import omni.usd from pxr import UsdGeom stage = omni.usd.get_context().get_stage() prim = stage.GetPrimAtPath("/World/BasisCurves") prim.GetAttribute("widths").Set([5, 10,5, 10,5, 10,5, 10,5, 10,5, 10,5]) curves: UsdGeom.BasisCurves = UsdGeom.BasisCurves(prim) print(curves.GetWidthsInterpolation())

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_09_30/scripts/omnigraph.py

""" https://docs.omniverse.nvidia.com/py/kit/source/extensions/omni.graph/docs/index.html https://docs.omniverse.nvidia.com/py/kit/source/extensions/omni.graph/docs/controller.html#howto-omnigraph-controller """ import omni.graph.core as og controller: og.Controller = og.Controller() keys = og.Controller.Keys # Create an Action Graph # SPDX-License-Identifier: Apache-2.0 graph = controller.create_graph({ "graph_path": "/World/CameraAim", "evaluator_name": "execution" # This makes it Action Graph }) # Create some nodes _, nodes, _, _ = controller.edit(graph, {keys.CREATE_NODES: ("OnTick", "omni.graph.action.OnTick")}) on_tick = nodes[0] _, nodes, _, _ = controller.edit(graph, {keys.CREATE_NODES: ("SetCameraTarget", "omni.graph.ui.SetCameraTarget")}) set_cam_target = nodes[0] # Edit an attribute # /World/CameraAim/OnTick.inputs:onlyPlayback controller.edit(graph, {keys.SET_VALUES: (on_tick.get_attribute("inputs:onlyPlayback"), False)}) # Connect two attributes controller.connect(on_tick.get_attribute("outputs:tick"), set_cam_target.get_attribute("inputs:execIn"))

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_09_30/scripts/vp2.py

# SPDX-License-Identifier: Apache-2.0 # DON'T DO THIS ANYMORE import omni.kit.viewport_legacy viewport_interface = omni.kit.viewport_legacy.acquire_viewport_interface() vp_win = viewport_interface.get_viewport_window() print(vp_win) # DO THIS import omni.kit.viewport.utility as vp_util vp_win = vp_util.get_active_viewport_window() print(vp_win)

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_09_30/docs/README.md

# Developer Office Hour - 09/30/2022 This is the sample code from the Developer Office Hour held on 09/30/2022, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - Why is the legacy viewport API not working anymore? - How do I create an OmniGraph using Python scripting?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_11_04/maticodes/doh_2022_11_04/extension.py

# SPDX-License-Identifier: Apache-2.0 from pathlib import Path import carb import numpy as np import omni.ext import omni.kit.app import omni.ui as ui from PIL import Image class MyWindow(ui.Window): def __init__(self, ext_path, title: str = None, **kwargs): super().__init__(title, **kwargs) data_dir = Path(ext_path) / "data" files = list(data_dir.glob("*")) self.images = [] for f in files: with Image.open(f) as img: np_data = np.asarray(img).data data = img.getdata() self.images.append((np_data, data, img.size)) self.provider = ui.ByteImageProvider() if hasattr(self.provider, "set_data_array"): self.provider.set_data_array(self.images[0][0], self.images[0][2]) else: self.provider.set_bytes_data(self.images[0][1], self.images[0][2]) self.frame.set_build_fn(self._build_window) def _build_window(self): with ui.ScrollingFrame(): with ui.VStack(height=0): ui.ImageWithProvider(self.provider, width=100, height=100) def clicked(): img = self.images.pop() self.images.insert(0, img) if hasattr(self.provider, "set_data_array"): self.provider.set_data_array(img[0], img[2]) else: self.provider.set_bytes_data(img[1], img[2]) ui.Button("Click Me", clicked_fn=clicked) class MyExtension(omni.ext.IExt): def on_startup(self, ext_id): carb.log_info("[maticodes.doh_2022_11_04] Dev Office Hours Extension (2022-11-04) startup") manager = omni.kit.app.get_app().get_extension_manager() ext_path = manager.get_extension_path(ext_id) self._window = MyWindow(ext_path, "MyWindow", width=300, height=300) def on_shutdown(self): carb.log_info("[maticodes.doh_2022_11_04] Dev Office Hours Extension (2022-11-04) shutdown") if self._window: self._window.destroy() self._window = None

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_11_04/scripts/progress_bar.py

# SPDX-License-Identifier: Apache-2.0 import omni.ui as ui style = { "color": ui.color.red, "background_color": ui.color.blue, "secondary_color": ui.color.white, } class CustomProgressValueModel(ui.AbstractValueModel): """An example of custom float model that can be used for progress bar""" def __init__(self, value: float): super().__init__() self._value = value def set_value(self, value): """Reimplemented set""" try: value = float(value) except ValueError: value = None if value != self._value: # Tell the widget that the model is changed self._value = value self._value_changed() def get_value_as_float(self): return self._value def get_value_as_string(self): return f"{self._value*100:.0f}%" my_window = ui.Window("Example Window", width=300, height=300) with my_window.frame: with ui.VStack(): model = CustomProgressValueModel(0.0) pb = ui.ProgressBar(model, style=style, height=0) # pb = ui.ProgressBar(style=style, height=0) def clicked(): print("clicked") value = pb.model.as_float pb.model.set_value(value + 0.1) ui.Button("Plus One", clicked_fn=clicked)

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_11_04/scripts/loop.py

# SPDX-License-Identifier: Apache-2.0 my_list = [1,2,3] s = set([1,2,3]) d = {"one": 1, "two": 2} t = (1,2,3) # range, enumerate, filter, map, zip # https://docs.python.org/3.7/library/functions.html # Topics to research: Iterable, iterator, generator from pxr import Vt, Gf for i, x in enumerate(my_list): print(i, x) for x in Gf.Vec3f([1,2,3]): print(x) my_usd_arr = Vt.BoolArray([False, True, False]) print(type(my_usd_arr)) for x in my_usd_arr: print(x) for i, x in Vt.BoolArray([False, True, False]): print(i, x) class PowTwo: num = 1 def __iter__(self): return self def __next__(self): self.num = self.num * 2 if self.num > 32: raise StopIteration() return self.num pow2 = PowTwo() # for x in pow2: # print(x) print(next(pow2)) print(next(pow2)) print(next(pow2)) print(next(pow2)) print(next(pow2)) print(next(pow2)) print(next(pow2))

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_11_04/docs/README.md

# Developer Office Hour - 11/04/2022 This is the sample code from the Developer Office Hour held on 11/04/2022, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - How can I display dynamic images within a frame? - What can I use a for loop with? - How do I create a progress bar?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_05_12/scripts/my_script.py

# SPDX-License-Identifier: Apache-2.0 import omni.ui as ui

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_05_12/docs/README.md

# Developer Office Hour - 05/12/2023 This is the sample code from the Developer Office Hour held on 05/12/2023, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - 02:30 - How do you add two windows from one extension?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_01_20/scripts/check_omni_file_exists.py

# SPDX-License-Identifier: Apache-2.0 import omni.client result, list_entry = omni.client.stat("omniverse://localhost/Users/test/helloworld_py.usd") if result == omni.client.Result.OK: # Do things print(list_entry) # When a file doesn't exist, the result is omni.client.Result.ERROR_NOT_FOUND result, list_entry = omni.client.stat("omniverse://localhost/Users/test/fake.usd") print(result, list_entry)

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_01_20/scripts/duplicate_prim.py

# SPDX-License-Identifier: Apache-2.0 # paths_to import omni.kit.commands result = omni.kit.commands.execute('CopyPrims', paths_from=['/World/Cube'], paths_to=["/World/MyCopiedCube"], duplicate_layers=False, combine_layers=False, flatten_references=False) print(result)

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_01_20/scripts/selection_changed_event.py

# SPDX-License-Identifier: Apache-2.0 import carb import omni.usd usd_ctx = omni.usd.get_context() def on_selection_changed(event: carb.events.IEvent): print("Selection Changed") # https://docs.omniverse.nvidia.com/prod_kit/prod_kit/python-snippets/selection/get-current-selected-prims.html selection = usd_ctx.get_selection().get_selected_prim_paths() print(f"New selection: {selection}") sel_sub = usd_ctx.get_stage_event_stream().create_subscription_to_pop_by_type(omni.usd.StageEventType.SELECTION_CHANGED, on_selection_changed) # Don't forget to unsubscribe when you're done with it or when your extension shuts down. sel_sub.unsubscribe()

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2023_01_20/docs/README.md

# Developer Office Hour - 01/20/2023 This is the sample code from the Developer Office Hour held on 01/20/2023, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - 3:57 - How do I check if a file exists using the Omni Client Library? - 6:51 - How do I duplicate a prim? - 13:53 - Is there an event for when a user's prim selection changes?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_09_02/scripts/what_is_sc.py

# SPDX-License-Identifier: Apache-2.0 from omni.ui import scene as sc

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_09_02/scripts/get_local.py

# SPDX-License-Identifier: Apache-2.0 import omni.usd from pxr import Usd, Gf stage = omni.usd.get_context().get_stage() prim = stage.GetPrimAtPath("/World/Cube_01") scale, rotate, rot_order, translate = omni.usd.get_local_transform_SRT(prim, time=Usd.TimeCode.Default()) print(scale, rotate, rot_order, translate) # Gf.Vec3d # (Double, Double, Double) # Gf.Matrix4d # (Double, Double, Double, Double) # (Double, Double, Double, Double) # (Double, Double, Double, Double) # (Double, Double, Double, Double) matrix:Gf.Matrix4d = omni.usd.get_local_transform_matrix(prim, time_code=Usd.TimeCode.Default()) print(matrix)

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_09_02/scripts/define_ui_colors.py

# SPDX-License-Identifier: Apache-2.0 import omni.ui as ui from omni.ui import color as cl my_window = ui.Window("Example Window", width=300, height=300) with my_window.frame: with ui.VStack(): ui.Label("AABBGGRR", style={"color": 0xFF00FFFF}) # STAY AWAY FROM ui.Label("Float RGB", style={"color": cl(1.0, 1.0, 0.0)}) ui.Label("Float RGBA", style={"color": cl(1.0, 1.0, 0.0, 0.5)}) ui.Label("Int RGB", style={"color": cl(255, 255, 0)}) ui.Label("Int RGBA", style={"color": cl(255, 255, 0, 128)}) ui.Label("Oops RGB", style={"color": cl(1, 1, 0)}) ui.Label("Web Hex RGB", style={"color": cl("#FFFF00")}) ui.Label("Web Hex rgb", style={"color": cl("#ffff00")}) ui.Label("Web Hex RGBA", style={"color": cl("#FFFF0088")}) ui.Label("Float RGB White", style={"color": cl(1.0, 1.0, 1.0)}) ui.Label("Float RGB 50%", style={"color": cl(0.5, 0.5, 0.5)}) ui.Label("Float Greyscale White", style={"color": cl(1.0)}) ui.Label("Float Greyscale 50%", style={"color": cl(0.5)}) ui.Label("Int Greyscale White", style={"color": cl(255)}) ui.Label("Int Greyscale 50%", style={"color": cl(128)}) ui.Label("Web Color Name", style={"color": cl.yellow})

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_09_02/scripts/add_menu.py

# SPDX-License-Identifier: Apache-2.0 import omni.kit.ui menu_path = "File/Foo" menu_path2 = "File/Foo/Bar" def on_menu_click(menu_path, toggled): print(menu_path) print(toggled) menu = omni.kit.ui.get_editor_menu().add_item(menu_path, on_menu_click) menu = omni.kit.ui.get_editor_menu().add_item(menu_path2, on_menu_click, True) omni.kit.ui.get_editor_menu().remove_item(menu) import omni.kit.menu.utils from omni.kit.menu.utils import MenuItemDescription menu_item = MenuItemDescription( name="Hello World!", glyph="save.svg", onclick_fn=lambda: print("Hello World!"), # hotkey=( # carb.input.KEYBOARD_MODIFIER_FLAG_CONTROL | carb.input.KEYBOARD_MODIFIER_FLAG_ALT, # carb.input.KeyboardInput.S, #), ) menus = [menu_item] omni.kit.menu.utils.add_menu_items([menu_item], "File") omni.kit.menu.utils.remove_menu_items([menu_item], "File", rebuild_menus=True) # omni.kit.ui.get_editor_menu().convert_to_new_menu

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_09_02/scripts/what_is_cl.py

# SPDX-License-Identifier: Apache-2.0 import omni.ui as ui from omni.ui import color as cl # import omni.ui.color as color my_window = ui.Window("Example Window", width=300, height=300) with my_window.frame: with ui.VStack(): ui.Label("Hello World!", style={"color": cl(0.0, 1.0, 0.0)})

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_09_02/docs/README.md

# Developer Office Hour - 09/02/2022 This is the sample code from the Developer Office Hour held on 09/02/2022, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - What's the difference between a shape and a mesh? - How do I import cl? - How do I import sc? - How do I define UI colors? - How do I add an item to a menu?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_11_18/maticodes/doh_2022_11_18/extension.py

# SPDX-License-Identifier: Apache-2.0 import carb import omni.ext from omni.kit.viewport.utility import get_active_viewport_window import omni.ui as ui class MyExtension(omni.ext.IExt): def on_startup(self, ext_id): carb.log_info("[maticodes.doh_2022_11_18] Dev Office Hours Extension (2022-11-18) startup") self.custom_frame = None viewport_window = get_active_viewport_window() if viewport_window is not None: self.custom_frame: ui.Frame = viewport_window.get_frame(ext_id) with self.custom_frame: with ui.VStack(): ui.Spacer() with ui.HStack(height=0): ui.Spacer() ui.Button("Hello", width=0, height=0) def on_shutdown(self): carb.log_info("[maticodes.doh_2022_11_18] Dev Office Hours Extension (2022-11-18) shutdown") self.custom_frame.destroy() self.custom_frame = None

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_11_18/scripts/placer_model.py

# SPDX-License-Identifier: Apache-2.0 import omni.ui as ui my_window = ui.Window("Example Window", width=300, height=300) model = ui.SimpleFloatModel() sub = None with my_window.frame: with ui.VStack(): ui.FloatSlider(model=model) def body_moved(body, model): if body.offset_x.value > 100: body.offset_x.value = 100 elif body.offset_x.value < 0: body.offset_x.value = 0 model.set_value(body.offset_x.value / 100.0) body = ui.Placer(draggable=True, drag_axis=ui.Axis.X, offset_x=0) with body: rect = ui.Rectangle(width=25, height=25, style={"background_color": ui.color.red}) body.set_offset_x_changed_fn(lambda _, b=body, m=model: body_moved(b, m)) def slider_moved(model, body): body.offset_x.value = model.as_float * 100 sub = model.subscribe_value_changed_fn(lambda m=model, b=body: slider_moved(m, b))

Python

mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_11_18/docs/README.md

# Developer Office Hour - 11/18/2022 This is the sample code from the Developer Office Hour held on 11/18/2022, Mati answered some developer questions from the NVIDIA Omniverse forums regarding Kit, Omniverse Code, Python, and USD. ## Questions - How do I add widgets on top of the viewport? (ViewportWindow.get_frame) - How do I use value model with ui.Placer? - How do I see all of the code from the UI documentation examples?

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mati-nvidia/developer-office-hours/exts/maticodes.doh_2022_10_07/scripts/usd_update_stream.py

# SPDX-License-Identifier: Apache-2.0 import omni.usd from pxr import UsdGeom, Gf stage = omni.usd.get_context().get_stage() cube = stage.GetPrimAtPath("/World/Cube") def print_pos(changed_path): print(changed_path) if changed_path.IsPrimPath(): prim_path = changed_path else: prim_path = changed_path.GetPrimPath() prim = stage.GetPrimAtPath(prim_path) world_transform = omni.usd.get_world_transform_matrix(prim) translation: Gf.Vec3d = world_transform.ExtractTranslation() rotation: Gf.Rotation = world_transform.ExtractRotation() scale: Gf.Vec3d = Gf.Vec3d(*(v.GetLength() for v in world_transform.ExtractRotationMatrix())) print(translation, rotation, scale) cube_move_sub = omni.usd.get_watcher().subscribe_to_change_info_path(cube.GetPath(), print_pos)

Python