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# Copyright (c) Meta Platforms, Inc. and affiliates.
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
from animated_drawings.model.transform import Transform
from animated_drawings.model.time_manager import TimeManager
from animated_drawings.config import SceneConfig
from animated_drawings.model.floor import Floor
from animated_drawings.model.animated_drawing import AnimatedDrawing
class Scene(Transform, TimeManager):
"""
The scene is the singular 'world' object.
It contains all objects that need to be drawn.
It keeps track of global time.
"""
def __init__(self, cfg: SceneConfig) -> None:
""" Takes in the scene dictionary from an mvc config file and prepares the scene. """
super().__init__()
# add floor if required
if cfg.add_floor:
self.add_child(Floor())
# Add the Animated Drawings
for each in cfg.animated_characters:
ad = AnimatedDrawing(*each)
self.add_child(ad)
# add bvh to the scene if we're going to visualize it
if cfg.add_ad_retarget_bvh:
self.add_child(ad.retargeter.bvh)
def progress_time(self, delta_t: float) -> None:
"""
Entry point called to update time in the scene by delta_t seconds.
Because animatable object within the scene may have their own individual timelines,
we recurvisely go through objects in the scene and call tick() on each TimeManager.
"""
self._progress_time(self, delta_t)
def _progress_time(self, t: Transform, delta_t: float) -> None:
""" Recursively calls tick() on all TimeManager objects. """
if isinstance(t, TimeManager):
t.tick(delta_t)
for c in t.get_children():
self._progress_time(c, delta_t)
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