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Enable built-in frame buffer – Enables the use of built-in V-Ray Frame Buffer. When disabled, renderings appear in the 3ds Max frame buffer instead.

Memory frame buffer – Creates a V-Ray frame buffer and uses it to store color data that you can observe while rendering and afterwards. If you wish to render really high resolutions that would not fit into memory or that may eat up a lot of your RAM not allowing for the scene to render properly, you can turn this feature off and use only the Render to V-Ray raw image file feature.

Show last VFB – Opens the V-Ray VFB if it has already rendered and then closed. The same can also be achieved with the showLastVFB() MaxScript method of the V-Ray renderer.

Reset VFB position – Returns the V-Ray VFB to its original location in case its position has been previously changed.

Get resolution from 3ds Max – Causes the V-Ray VFB to take its resolution from the 3ds Max common render settings.

Image aspect – Specifies the image aspect for the rendered image in the VFB when Get resolution from Max is disabled

Pixel aspect – Specifies the pixel aspect for the rendered image in the V-Ray frame buffer when Get resolution from Max is disabled.

Width – Specifies the width of the image when Get resolution from Max is disabled.

Height – Specifies the height of the image when Get resolution from Max is disabled.

Swap – Swaps the values of Height and Width parameters.

Preset – Selects a resolution for the V-Ray VFB from a list of resolution presets when the Get resolution from 3ds Max is disabled.

V-Ray raw image file – When enabled, V-Ray directly writes to disk the raw image data as it is being rendered. It does not store any data in the RAM, so this feature is very handy when rendering huge resolutions for preserving memory with Memory frame buffer disabled. To see what is being rendered, turn on the Generate preview setting. See the Save V-Ray Image File section for more information. 

Generate preview – Creates a small preview of what is being rendered. If you are not using the V-Ray memory frame buffer for conserving memory (i.e. Render to memory frame buffer is disabled), you can use this feature to see a small image of what is being actually rendered and stop the renderer if there is anything that looks wrong.

Separate render channels – Saves the channels from the VFB into separate files. Use the Browse... button to specify the file. This option is available only when rendering to a memory frame buffer. If rendering is done only to a raw image file, the render channels can be extracted from that file after rendering is complete. If the VRayDenoiser render element is enabled, the RGB channel is saved with the text origRGB appended to the filename, and the effectsResult channel has the text RGB_color appended to it.

Separate folders – Saves each render element to a separate folder based on its name.

Expand # to frame number – (enabled by default) Disable it to stop V-Ray from replacing the # symbol with frame numbers for separate render channels. 

Save RGB and Save Alpha – Disables saving of the RGB and Alpha channels respectively. This can be useful if you only want to generate other render channels. Note that V-Ray still generates the RGB and Alpha channels; however, they are not saved.

Save VFB color corrections to render elements – When enabled, saves the VFB color correction to render elements.

Note: All saving formats are supported by the VFB (Render Setup > V-Ray tab > Frame Buffer) and 3ds Max output (Render Setup > Common tab > Render Output). Resumable information is stored in additional .vrimg or .vrprog files. Resuming a render with bucket sampling uses and creates additional .vrimg files. Resuming a render with progressive sampling uses and creates separate .vrprog (progressive resumable) files. For instance, if resumable rendering is enabled when rendering to a PNG file format using the progressive sampler, resumable information will be saved as a .vrprog file along with the output PNG.

Autosave Interval (min) – Specifies an interval in minutes for saving resumable files during rendering. This usage applies only to Progressive sampling; Bucket renderings are saved on every completed bucket. A value of 0 disables autosaving during rendering and resumable files are saved only at the end of the rendering.

Delete resumable data from completed frames – When enabled, the resumable file is deleted automatically if the frame is completed successfully. This applies for additional .vrimg or .vrprog files, it doesn't apply when the output image file is .vrimg.