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# Layers and Viewport Filters

This section presents the use of 2D and 3D layers within the Mudbox SDK, and also describes viewport filters, which are applied to the rendered scene before it is displayed.

Layers are used for organizing objects and transparency values assigned to each element. There are two kinds of layers: 2D layers, derived from Layer, and 3D (sculpt) layers derived from LayerMeshData.

Layer and Viewport Filter Related Classes

- Layer - The base class for anything which is an element of a list with a fixed order and a transparency value assigned to each element. For more information see the topic 2D Layers.
- LayerMeshData - Represents a 3D sculpt layer. It stores offsets (deltas) to the vertex positions of a mesh. For more information see the topic Sculpt Layers.
- LayerContainer - Contains and manages a list of layers. For more information see the topic Layer Containers.
- ViewPort - Represents the 3D viewport where Mudbox renders the scene. For more information see the topic Viewports.
- ViewPortFilter - Represents an object which is used to apply some post-processing effect to the viewport. For more information see the topic Viewport Filters.
- ViewPortState - Holds all the information about the current viewport state, used by ViewPortFilter objects. For more information see the topic Viewport Filters.

#### Topics in this section

- 2D Layers
- Layer Containers
- Sculpt Layers
- Viewports
- Viewport Filters