This page provides information on the GLSL Material.


Page Contents ×


The VRayGLSLMtl can be used to load OpenGL Shading Language  GLSL shaders and render them directly with V-Ray.

This material is the first stage of the V-Ray implementation of GLSL support. In this version, 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.

In addition, you can modify the shader or write your own code directly in the Quick Shader area.

Please refer to the VRayGLSLTex page and GLSL Support page for information.



UI Path


||Material Editor window|| > Material/Map Browser > Materials > V-Ray > VRayGLSLMtl



The General rollout holds parameters that control common shader characteristics.

shader file – Specifies the .glsl or .frag file which contains the shader (object) code. This button control also supports a context menu with the following options:

Clear – Unloads the current shader and restores the plug-in as if no shaders have been loaded.
Reset – Reloads the shader and resets its parameters to the default values.
Reload – Reloads the shader but keeps the current parameter values.
Open Containing Folder – Reveals the shader location in Explorer.
Open in External Editor – Opens the shader in an appropriate text editor.
Open in Quick Shader  Opens the loaded file's code in the text editor of the Quick Shader. 
Recent Files – Holds a list of the recently loaded shaders and an option to clear the list.

max ray depth – Specifies the maximum reflection/refraction depth for the shader.

show preview – Determines whether to render a shader preview in the 3ds Max Material Editor.

clamp shader result – Determines whether to force the result into the [0, clamping limit] range.

clamping limit – Specifies the upper clamp limit if clamp shader result is enabled.

viewport color – Specifies the diffuse component of the material used in viewport shading.

Export shader – Allows the user to save his shader file as a binary precompiled fragment shader file ( .pfrag ).

Compiler Output

The Compiler Output rollout holds shader compilation and manipulation result messages.


Quick Shader 

If you want to manually modify the shader's code, you can do that in the Quick Shader area. 


Enable – Makes the Quick Shader's text area active. 

Once enabled, place the original code inside the text area. Alternatively, start writing in the blank area your own code. 

If you have already loaded a shader in the material parameters, right-click on it and select Open in Quick Shader option. 



Another way to do this is to activate the text area and drag and drop the .glsl (.frag) file in there. It will load the code instantly. 

Right-clicking on the Quick Shader panel opens a context menu. You can Compile the code after doing changes or Compile and Reset Parameters, which affects the values of the parameters in the shader as well.



Once ready with editing, press the Compile button to refresh the UI. Modifications are updated in the UI and renderer after the successful code compilation. You can monitor the messages in the Compiler Output rollout during compilation. 

The shader file originally loaded in the material (if any) will not be affected in the compilation. You need to manually save your code.



This is automatically generated rollout menu showing the shader's specific options.