Doc:2.6/Manual/Textures/Types/Volume

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Volume Textures

Blender has two textures that can be applied to volumetric data:

Voxel Data

Voxel data renders a voxel source. It can be used for rendering Blender's internal smoke simulations. Other sources include binary raw formats, and Image Sequence, which can be used to stack a sequence of images into a 3D representation

Point Density

Point density renders a given point cloud (object vertices or particle system) as a 3D volume