Autodesk Mudbox 2013 SDK Documentation > Layers and Viewport Filters >

# Viewport Filters

Viewport filters (ViewPortFilter) are post-processing effects applied to the viewport that derive from Layer. Some examples of viewport filters are:

- ambient occlusion
- normal map
- depth map
- texture swapper
- depth of field
- tone-mapper
- non-photorealistic rendering

A ViewPortState is used to represent the information about the current viewport state, required by a ViewPortFilter object.

The Mudbox SDK ships with two viewport filters: examples\SampleViewportFilter and examples\TextureSwapperViewportFilter.