However, its integration into a complete 3D package means that the shader writer can access the information inside the shader, a feature that is not usually available in a rendering context. Houdini VEX (Vector Expressions) shading language (often abbreviated to "VEX") is closely modeled after RenderMan. Such data has a greater dynamic range and color resolution than can be displayed on a typical output device. This is much like an image filter, however the imager shader operates on data prior to quantization. Imager shaders describe a color transformation to final pixel values.Volume shaders manipulate the color of a light as it passes through a volume. Only one RenderMan implementation, the AIR renderer by SiTex Graphics, implemented this shader type, supporting only a single linear transformation applied to the space (this was more like a Transformation shader, if such a type existed).
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