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From Odwiki

A texture map is an image file which is mapped to a surface in the rendering process. Typically the mapping is performed using TextureCoordinates, but this is not a requirement. The map may be used to modulate surface color, perform bump mapping or for other diverse purposes.

mantra can use any supported image format as a texture map. However, to perform high-quality TextureFiltering, the rat FileFormats should be used. Any Houdini tool which saves images can be used to convert an image into the rat file format. As well, the utility isixpack can be used to generate cubic reflection map rat files.

PrMan requires textures to be in a special form of TIFF files, or in a proprietary texture format. These files can be created using the utility txmake.

RenderDotC requires textures to be in a special form of TIFF files. These files can be created using the utility texdc.