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This page provides information on the MDL Material.

 


Overview

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 The MDL Material is not supported in Maya 2015 on Mac OS X

V-Ray supports NVIDIA Material Definition Language, version 1.7.2.

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

 

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 The MDL Material does not work within Distributed Rendering at this time.

The MDL Material is currently not supported by V-Ray for Maya 2024, running on macOS.

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titleUI Path: ||Right-click on the geometry|| > Assign New Material...
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||Right-click on the geometry|| > Assign New Material... > VRay section > VRay Mtl MDL

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||V-Ray Shelf|| > Right-click to Create V-Ray Materials button > VRay Mtl MDL

 


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||Hypershade|| > Window tab >  Create... > VRay section > VRay Mtl MDL



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Installed Material Library

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The following MDL material files are included when installing V-Ray for Maya 3.6. They are located in Local Disk (C:) > Program Files > Chaos Group > V-Ray > Maya 20yy 20xx for x64 > vray > mdl.


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Aluminum Anodized

 


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Architectural 


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Asphalt 


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Carbon composite

 


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Carpet Berber White 


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Ceramic Tiles Small

 


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Chrome 


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Coated Flipflop Paint

 


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Coated Flint Glass 


 
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Colored Wax 


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Concrete

 


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Concrete Polished

 


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Copper 


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Granite Black

 


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Mahogany Floorboards

 


 
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Marble White

 


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Metal Examples

 


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Noise Flow Glossy

 


 
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Noise Perlin Glossy

 


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Noise Worley Glossy

 


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Pattern Blended 


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Pattern Checker Glossy

 


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Porcelain

 


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Resin Polyurethane Matte 


 
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Rubber Studded Black

 


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Stucco 


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Walnut Semi-Gloss

 


 
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Basic

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Basic Attributes

The Basic rollout provides the attributes used to set the path to

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the .mdl

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 file that you wish to load into your chosen material, and an Update button needed to refresh the other attributes available, based on the material file used.

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MDL file

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 – Specifies the file path and .mdl

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 file loaded.

Chosen

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material – If more than one material definition is included in the loaded .mdl

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 file, the selected materials will be seen in the rollouts below.

MDL parameters– The Update button refreshes the additional material-specific attributes for the

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loaded .mdl

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Parameters

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Parameters

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Any additional material-specific attributes (if any) are listed in this rollout. The example below shows parameters for

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the Coated Flip-flop Paint material.

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MDL
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 MDL material attributes that can accept Render Nodes to map color values can now use File textures as input. Note

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that while other texture types may also be used, only File textures are guaranteed to work properly.

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Asphalt parameters

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Max Ray Depth

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

Remap Roughness

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 – When enabled (default), determines whether the plugin expects squared values for GGX Roughness settings.

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System Attributes

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 – Specifies the file path and .mdl

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Importing NVIDIA vMaterials

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In order for the MDL Material to correctly import NVIDIA vMaterials, the following two paths should be set in the environment variable shown below:

VRAY_MDL_PATH_MAYA20yy_x64=%PROGRAMFILES%\Chaos Group\V-Ray\Maya 20yy 20xx for x64\mdl;%PROGRAMDATA%\NVIDIA Corporation\mdl;%USERPROFILE%\Documents\mdl

where yy xx is the version of Maya installed. 


Example:

VRAY_MDL_PATH_MAYA2018MAYA2024_x64=C:\Program Files\Chaos Group\V-Ray\Maya 2018 2024 for x64\mdl;%PROGRAMDATA%\NVIDIA Corporation\mdl;%USERPROFILE%\Documents\mdl

 


Importing MDL Files from Substance Designer Designer

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In some cases, when using MDL files exported from Substance Designer, V-Ray may fail to load some modules. In order to load these modules, a folder needs to be set up before starting Maya, as expalined explained below:

1.  Make a folder, for example, X:\MDL, that will act as the MDL repository. Put the MDL modules that are exported from Substance Designer into this folder.

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3.  Tell V-Ray where the MDL repository is by appending it to the VRAY_MDL_PATH_MAYA20yyMAYA20xx_x64 environment variable.

4.  Find the folder where Substance Designer keeps its MDL modules (usually C:\Program Files\AllegorithmicAdobe\Adobe Substance 3D Designer 5\resources\view3d\iray\alg but may differ from version to version) and append its path to the same environment variable. 

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VRAY_MDL_PATH_MAYA2018_x64=C:\Program Files\Chaos Group\V-Ray\Maya 2018 for x64\mdl;C:\Program Files\AllegorithmicAdobe\Adobe Substance 3D Designer 5\resources\view3d\iray\alg;X:\MDL


Known Limitations

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  • material_emission.mode is ignored
  • material.backface is ignored

  • df::diffuse_transmission_bsdf is not supported

  • df::backscattering_glossy_reflection_bsdf is not supported

  • df::measured_bsdf is not supported

  • From the “alternative distribution functions”, only df::microfacet_ggx_smith_bsdf is implemented

  • df::measured_edf and df::spot_edf are not supported

  • df::anisotropic_vdf is not supported

  • 3D textures are not yet supported

  • The multiscatter_tint parameter in simple_glossy_bsdf, microfacet_ggx_smith_bsdf, ward_geisler_moroder_bsdf is ignored.
  • The tint (color reflection_tint, color transmission_tint, bsdf base) modifier overload for separate tinting of the reflective and transmissive light paths is not supported.

References

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