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On some machines the 3DS Max application is not able to recognize the GPU devices installed and this may affect V-Ray RT GPU as well.
We have implemented a workaround for this particular case, which is to turn off the In-Process option from the RT settings panel. This way V-Ray RT will start as a separate process.
Usually the error message printed in the log is:
*) Cannot initialize CUDA! No CUDA devices are available!
*) PTX loading failed!
and sometimes the installed graphic card/s is even not listed in the Render device select window under RT/CUDA Render setup window.
Since this is not a problem related to V-Ray, currently we don't have any clue why this happens, so the best we could do is to provide this workaround.
We have implemented a workaround for this particular case, which is to turn off the In-Process option from the RT settings panel. This way V-Ray RT will start as a separate process.
Usually the error message printed in the log is:
*) Cannot initialize CUDA! No CUDA devices are available!
*) PTX loading failed!
and sometimes the installed graphic card/s is even not listed in the Render device select window under RT/CUDA Render setup window.
Since this is not a problem related to V-Ray, currently we don't have any clue why this happens, so the best we could do is to provide this workaround.
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