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.. _quickstart_guide:
Quickstart
==========
Minimal Example for 3D Viewer
-----------------------------
Here is a minimal example of loading and viewing a triangular mesh model
in pyrender.
>>> import trimesh
>>> import pyrender
>>> fuze_trimesh = trimesh.load('examples/models/fuze.obj')
>>> mesh = pyrender.Mesh.from_trimesh(fuze_trimesh)
>>> scene = pyrender.Scene()
>>> scene.add(mesh)
>>> pyrender.Viewer(scene, use_raymond_lighting=True)
.. image:: /_static/fuze.png
Minimal Example for Offscreen Rendering
---------------------------------------
.. note::
If you're using a headless server, make sure that you followed the guide
for installing OSMesa. See :ref:`osmesa`.
Here is a minimal example of rendering a mesh model offscreen in pyrender.
The only additional necessities are that you need to add lighting and a camera.
>>> import numpy as np
>>> import trimesh
>>> import pyrender
>>> import matplotlib.pyplot as plt
>>> fuze_trimesh = trimesh.load('examples/models/fuze.obj')
>>> mesh = pyrender.Mesh.from_trimesh(fuze_trimesh)
>>> scene = pyrender.Scene()
>>> scene.add(mesh)
>>> camera = pyrender.PerspectiveCamera(yfov=np.pi / 3.0, aspectRatio=1.0)
>>> s = np.sqrt(2)/2
>>> camera_pose = np.array([
... [0.0, -s, s, 0.3],
... [1.0, 0.0, 0.0, 0.0],
... [0.0, s, s, 0.35],
... [0.0, 0.0, 0.0, 1.0],
... ])
>>> scene.add(camera, pose=camera_pose)
>>> light = pyrender.SpotLight(color=np.ones(3), intensity=3.0,
... innerConeAngle=np.pi/16.0,
... outerConeAngle=np.pi/6.0)
>>> scene.add(light, pose=camera_pose)
>>> r = pyrender.OffscreenRenderer(400, 400)
>>> color, depth = r.render(scene)
>>> plt.figure()
>>> plt.subplot(1,2,1)
>>> plt.axis('off')
>>> plt.imshow(color)
>>> plt.subplot(1,2,2)
>>> plt.axis('off')
>>> plt.imshow(depth, cmap=plt.cm.gray_r)
>>> plt.show()
.. image:: /_static/minexcolor.png
:width: 45%
:align: left
.. image:: /_static/minexdepth.png
:width: 45%
:align: right
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