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Troubleshoot ambient occlusion transfer map appears grainy with lost details

mental ray for Maya transfer maps

Atmospheric effects in mental ray for Maya

 

User Guide > Rendering and Render Setup > Shading > mental ray for Maya Shading > Advanced mental ray for Maya shading > mental ray for Maya transfer maps > 

Troubleshoot mental ray for Maya aborts rendering when using normal maps

mental ray does not support LZW compressed .tif files.

If you create a normal map using the Transfer Maps tool and select tif as your file format, Maya will create the .tif file with a LZW compression. mental ray does not support the use of LZW compressed .tif files. and an error occurs as follows:

// Error: (Mayatomr.Output) : while defining texture "file1:tex": failed to open texture file C:/temp/sampledNormals.tif

Choose a different file format for your normal map. The EXR file format is recommended. If you encounter this error, you must also restart Maya to render with mental ray again.