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VRAY_GPU_PLATFORMS Specifies the CUDA devices to be used for V-Ray GPU rendering. This variable is automatically set when a device is selected using the V-Ray Render Settings (or the equivalent external tool provided with the V-Ray installation ocldeviceselectvray_gpu_device_select.exe ). If the variable is not set, all available devices will be used. The syntax allows a case insensitive pattern matching of any value to a device name, vendor, type and its index. More than one values can be specified by separating them with a semicolon.

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VRAY_MAC_GPUThough GPU rendering with CUDA on MacOS devices is no longer supported, the advanced users can bring back the old behavior by using this environment variable.  Enabling Enabling this environment variable is at your own risk!

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