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The core of how V-Ray determines how to render your Maya scenes can be found within the VRay tab of the Render Settings window. Some basic information on each rollout can be found below, but for more details, please see the dedicated pages for each section.

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V-Ray allows you to use both CPU and GPU hardware for production renders through the Production Renderer rollout. GPU rendering this way is different than using V-Ray IPR.

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Texture Mode – Determines how textures' resolution/size are handled to help optimize memory usage. The possible values are:

Full size textures – Textures are loaded at their original size.
Resize all textures – Adjusts the size of high-resolution textures to a smaller resolution to optimize render performance. The GPU engine loads as much texture tiles on the GPU as it can, then swaps the ones that are needed between GPU RAM and CPU RAM.
On-demand mipmapping – Instead of loading all the texture files at their default resolution (original or resized), V-Ray loads the textures as needed and automatically create mip-map tiles for them (regardless of their texture type). As a result, the GPU memory consumption could be decreased; textures that are not visible are not loaded, and textures that are further away from the camera are loaded with a lower resolution. During the texture-detection process, V-Ray GPU renders slower. Once it detects that all textures are loaded, it switches automatically to the traditional, faster mode, and a message about modes changing displays in the V-Ray log. This option is only available in the Production Rendering Mode.

Texture Size – When GPU Resize textures is enabled, this value specifies the resolution to which the textures are resized.

Texture Format – Controls the file format of the material textures used in GPU rendering. You can choose between 8 bit, 16 bit and 32 bit. This does not affect textures used for lights and displacement.

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