.. DO NOT EDIT. .. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY. .. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE: .. "gallery/gloo/colored_cube_instanced.py" .. LINE NUMBERS ARE GIVEN BELOW. .. only:: html .. note:: :class: sphx-glr-download-link-note :ref:`Go to the end ` to download the full example code .. rst-class:: sphx-glr-example-title .. _sphx_glr_gallery_gloo_colored_cube_instanced.py: Draw many colored cubes using instanced rendering ================================================= .. GENERATED FROM PYTHON SOURCE LINES 13-111 .. code-block:: Python import numpy as np from vispy import app, gloo, use from vispy.gloo import Program, VertexBuffer, IndexBuffer from vispy.util.transforms import perspective, translate, rotate from vispy.geometry import create_cube use(gl='gl+') vertex = """ uniform mat4 model; uniform mat4 view; uniform mat4 projection; // per-vertex attributes attribute vec3 position; attribute vec2 texcoord; attribute vec3 normal; attribute vec4 color; // unused (it's returned by generate_cube() but we don't need it) // per-instance attributes attribute vec3 instance_shift; attribute vec3 instance_color; varying vec4 v_color; void main() { v_color = vec4(instance_color, 1); gl_Position = projection * view * model * vec4(position + instance_shift,1.0); } """ fragment = """ varying vec4 v_color; void main() { gl_FragColor = v_color; } """ class Canvas(app.Canvas): def __init__(self): app.Canvas.__init__(self, size=(512, 512), title='Colored instanced cube', keys='interactive') # Build cube data V, I, _ = create_cube() vertices = VertexBuffer(V) self.indices = IndexBuffer(I) instance_shift = VertexBuffer(((np.random.rand(100, 3) - 0.5) * 50).astype(np.float32), divisor=1) instance_color = VertexBuffer(np.random.rand(5, 3).astype(np.float32), divisor=20) # Build program self.program = Program(vertex, fragment) self.program.bind(vertices) # Build view, model, projection & normal view = translate((0, 0, -100)) model = np.eye(4, dtype=np.float32) self.program['model'] = model self.program['view'] = view self.program['instance_shift'] = instance_shift self.program['instance_color'] = instance_color self.phi, self.theta = 0, 0 gloo.set_state(clear_color=(0.30, 0.30, 0.35, 1.00), depth_test=True) self.activate_zoom() self.timer = app.Timer('auto', self.on_timer, start=True) self.show() def on_draw(self, event): gloo.clear(color=True, depth=True) self.program.draw('triangles', self.indices) def on_resize(self, event): self.activate_zoom() def activate_zoom(self): gloo.set_viewport(0, 0, *self.physical_size) projection = perspective(45.0, self.size[0] / float(self.size[1]), 2.0, 200.0) self.program['projection'] = projection def on_timer(self, event): self.theta += .5 self.phi += .5 self.program['model'] = np.dot(rotate(self.theta, (0, 0, 1)), rotate(self.phi, (0, 1, 0))) self.update() if __name__ == '__main__': c = Canvas() app.run() .. rst-class:: sphx-glr-timing **Total running time of the script:** (0 minutes 0.192 seconds) .. _sphx_glr_download_gallery_gloo_colored_cube_instanced.py: .. only:: html .. container:: sphx-glr-footer sphx-glr-footer-example .. container:: sphx-glr-download sphx-glr-download-jupyter :download:`Download Jupyter notebook: colored_cube_instanced.ipynb ` .. container:: sphx-glr-download sphx-glr-download-python :download:`Download Python source code: colored_cube_instanced.py ` .. only:: html .. rst-class:: sphx-glr-signature `Gallery generated by Sphinx-Gallery `_