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The VRayMDLMtl material loads NVIDIA Material Definition Language files (.mdl) and renders them directly with V-Ray.

V-Ray supports NVIDIA Material Definition Language, version 1.57.2. 

 
Aluminum Anodized 

Architectural

Asphalt

Carbon composite 

Carpet Berber White 

Ceramic Tiles Small 

 
Chrome

 
Coated Flipflop Paint 

 
Coated Flint Glass 

 
Colored Wax

 
Concrete

 
Concrete Polished 

 
Copper 

 
Granite Black

 
Mahogany Floorboards

 
Marble White

 
Metal Examples

 
Noise Flow Glossy

 
Noise Perlin Glossy

 
Noise Worley Glossy

 
Pattern Blended 

 
Pattern Checker Glossy

 
Porcelain

 
Resin Polyurethane Matte

 
Rubber Studded Black 

 
Stucco 

 
Walnut Semi Gloss

The General rollout holds parameters that control common shader characteristics.

MDL filename – Specifies the .mdl file. 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.  
Open Containing Folder – Reveals the shader location in Explorer.
Open in External Editor – Opens the shader in an appropriate text editor.
Copy File Path – Puts the full path of the currently loaded file in the clipboard.
Copy Folder Path – Copies the parent directory of the currently loaded file into the clipboard.
Recent Files – Holds a list of the recently loaded shaders and an option to clear the history list.

MDL material – Displays the material name.

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

Show preview – Determines whether to render a shader preview in the material editor.

Clamp shader result – Determines whether to force the result in the [0, Clamping limit ] range or not.

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

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

Wrap texture coordinates – Automatically wraps the texture coordinates for the MDL material passing only values in the [0.0, 1.0] range.

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

The MDL Search Paths rollout hosts the system paths to available mdl modules, as well as options for manually adding and removing additional paths.

System paths are the ones defined with the V-Ray environment variable VRAY_MDL_PATH_3DSMAX20YY_x64 and NVIDIA environment variables MDL_SYSTEM_PATH and MDL_USER_PATH. Additional Paths are used to add root locations that will be searched when the given mdl module is not found in available system paths. Mdl modules can also reside in a sub-folder and will be automatically searched for without the need of adding the sub-folder's explicit path name. If an mdl module is loaded from a location that is not present in an already listed path, a pop-up window prompts you to add it to the list of Additional paths (or else it will not be loaded and rendered). All path lists are stored on a global level and are not scene specific.