This page provides information on the V-Ray GLSL Map.
The VRayMtlGLSL and VRayTexGLSL nodes can be used to load GLSL shaders (.frag, .glsl files) or V-Ray precompiled fragment shaders (.pfrag files) and render them directly with V-Ray. If the shader file describes a material (rather than a texture), it can be rendered with a VRayMtlGLSL material or by assigning a VRayTexGLSL map to the color slot of a VRayLightMtl material.
Note that both VRayGLSLMtl and VRayTexGLSL share the same user interface.
The VRayMtlGLSL material and the VRayTexGLSL map are part of the first stage of V-Ray implementation of GLSL support. In this version of V-Ray, the shaders are compiled to byte code for a software virtual machine, which is then interpreted. Due to this run-time interpretation, GLSL shaders can be somewhat slower to render than V-Ray shaders written in C++. In future builds of V-Ray, shaders will be directly compiled to machine code for faster rendering.
For the example on the right, four different VRayTexGLSL maps have been loaded into the diffuse channel of V-Ray Materials.
||Hypershade|| > Create panel > VRay section > 2D Textures > VRay Tex GLSL
||Create Render Node|| > VRay section > 2D Textures > VRay Tex GLSL
Shader File Name – Specifies the .glsl, .frag, or .pfrag file which contains the shader code.
Recreate attributes – Reloads the shader and recreate its parameters.
Save compiled shader – Saves the shader file as a binary precompiled fragment shader file (.pfrag).
Viewport color – Specifies the diffuse component of the material used in the viewport shading.
Max Ray Depth – Specifies the maximum reflection/refraction depth for the shader.
Clamp Result – Determines whether to force the result in the [0, Clamp Value] range or not.
Clamp Value – Specifies the upper clamp limit if Clamp Result is enabled.
Use Shader Alpha – When enabled, use the alpha calculated in the shader.
Transparency – Overrides the alpha if Use Shader Alpha is disabled.
This section holds all parameters found in the shader itself and can be edited from here.
- Randi J. Rost et al, OpenGL Shading Language, second edition, Addison-Wesley, 2006
- Lighthouse3D.com - a useful site that describes the basics of GLSL and has many shader examples