The buildGeometry() function stores shapes into a 3D model that can be efficiently used and reused.
Related Examples

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Geometries
Draw 3D shapes, including a custom model.

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Custom Geometry
Generate a 3D shape programmatically.

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Materials
Change 3D objects' color, texture, and how they respond to light.

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Orbit Control
Control the camera with the mouse.

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Filter Shader
Manipulate imagery with a shader.

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Adjusting Positions with a Shader
Use a shader to adjust shape vertices.

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Framebuffer Blur
Simulate a camera's depth of field.