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The V-Ray OSL map can be used to load Open Shading Language OSL shader code files (.osl) or OSL object code files (.oso) and render them directly with V-Ray. It can be used with shaders that have simple color and float output parameters. These parameters are considered respectively as texture RGB and alpha outputs.

If the shader file describes a material (rather than a texture) and writes its result in an output closure color parameter, it is advised to use the V-Ray OSL Material. Otherwise, the texture map will not evaluate the materials and would be rendered black.

For more on OSL in general, see the Github reference.

||mat Network|| > V-Ray> Texture: File > V-Ray OSL

The TexOSL node provides inputs that correspond to parameters in the section below.

OSL Source – Determines how the OSL code is drawn.

Inline OSL
File path (.oso/.osl)

OSL Code – A space for manual insertion of an OSL code.

Path to .oso/.osl file – Specifies the .osl or .oso file which contains the shader (object) code.

These rollouts are the standard V-Ray for Houdini texture rollouts.