Polycode's material system can be used to implement multi-pass post-processing screen shaders and assign them to scene cameras.

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Post processing overview.

Post processing can be used to create screen-based effects, like glare, color correction and depth of field.

On a technical level, it involves rendering the scene to a buffer and then passing it as a texture to a shader applied to a full screen quad. Polycode does all of that automatically when you apply a screen material to a Camera.

A screen material is similar to a regular material, but it can also define multiple passes using different shaders and can define texture buffers to render to.

Simple post-processing shaders.