The shader in this example uses depth information from a p5.Framebuffer to apply a blur. On a real camera, objects appear blurred if they are closer or farther than the lens’s focus. This simulates that effect. First, the sketch renders five spheres to the framebuffer. Then, it renders the framebuffer to the canvas using the blur shader.
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.