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- Make a folder that will act as the MDL repository, for example X:\MDL, and put in it the MDL modules that are exported from Substance Designer.
- Put the textures needed by the MDL materials in the same repository in their respective subfolder (for example, X:\MDL\MDL_Plywood_02).
- Tell V-Ray where the MDL repository is by appending it to the VRAY_MDL_PATH_3DSMAX20XX_x64 environment variable.
- Find the directory where Substance Designer keeps its MDL modules (usually C:\Program Files\Allegorithmic\Substance Designer 5\resources\view3d\iray\alg but may differ from version to version) and append its path to the same environment variable, separated by a semi-colon.
In the end, the environment variable should look something like:
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