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The settings in the Frame buffer rollout control various aspects of the V-Ray Frame Buffer, a display window for renderings optimized for V-Ray GPU.

When rendering in 3ds Max without V-Ray, renderings appear in the 3ds Max frame buffer. The V-Ray Frame Buffer works similarly in that it displays the rendered image as it is generated, and also provides additional tools specific to V-Ray GPU.

UI Path: ||Render Setup window|| > V-Ray tab > Frame Buffer rollout (Renderer set to V-Ray GPU)

Open VFB – Opens the V-Ray Frame Buffer.

Show render log – Opens the V-Ray messages (log) window.

Enable built-in VFB – Enables the use of the built-in V-Ray Frame Buffer. When disabled, the rendered image appears in the 3ds Max frame buffer instead.

Memory frame buffer – Creates a V-Ray frame buffer and uses it to store color data that can be observed while rendering and afterwards.

Fit IPR resolution to VFB – When enabled, V-Ray GPU adjusts the rendering resolution to fit in the VFB when rendering in IPR mode. When disabled, the full resolution is used in the VFB.

Post-effects update rate – The frequency of post-effects updates, such as denoising and lens effects, during progressive rendering; roughly the percentage of time calculations are allowed to take compared to the total render time. Zero disables updates during progressive rendering. Larger values cause the effect to be updated more often. A value of 100 updates the post effects as often as possible. Values between 5 and 10 are usually sufficient. Viewport IPR uses update rate of 100 unless the value is set to 0. If the value is 0, then the render is not denoised in Viewport IPR.

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 RAM, so this feature is very handy when rendering huge resolutions for preserving memory. See the Save V-Ray Image File for more information. 

Generate preview – Creates a small preview of what is being rendered.

Separate render channels – Allows you to save the channels from the VFB into separate files. Use the Browse... button to specify the output 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.

Save RGB / Save Alpha – Allows you to disable saving the RGB and Alpha channels respectively. This is 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.

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

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

Resumable rendering – If there is a resumable file existing for the current frame, the rendering is resumed from it. Otherwise a new render is started and resumable files are saved. If the rendering is already complete, the frame is skipped and the next one (if any) is started. For more details, please see the Resumable Rendering tutorial page.

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 files. For instance, if resumable rendering is enabled when rendering to a PNG file format, resumable information is saved as a .vrimg 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.