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The following MDL material files are included when installing V-Ray for Maya. They are located in Local Disk (C:) > Program Files > Chaos Group > V-Ray > Maya 20yy 20xx for x64 > vray > mdl.
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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
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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 explained below:
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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.
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VRAY_MDL_PATH_MAYA2018_x64=C:\Program Files\Chaos Group\V-Ray\Maya 2018 for x64\mdl;C:\Program Files\Adobe\Adobe Substance 3D Designer\resources\view3d\iray\alg;X:\MDL
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