This page provides information on the Frame Buffer rollout in the V-Ray tab when V-Ray GPU is used as the production renderer.
Overview
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.
Due to technical reasons, the original 3ds Max frame buffer is still created at render time even if rendering to the V-Ray Frame Buffer. However, when the V-Ray Frame Buffer is enabled, V-Ray will not render any data to the 3ds Max frame buffer.
UI Path
||Render Setup window|| > V-Ray tab > Frame Buffer rollout
Parameters
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.
Show GPU stats in VFB – When enabled, displays GPU statistics in the top right corner of the frame. The information is updated during rendering.
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.
If you are using the Progressive Image Sampler, the image is kept in memory during the rendering. You need to manually stop the rendering, or set a limit and wait for the rendering to complete before the .vrimg is saved.
Generate preview – Creates a small preview of what is being rendered.
Separate render channels – Allows the user 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 Lens Effects or the VRayDenoiser render element are enabled, the RGB channel is saved with the text origRGB appended to the file name, and the effectsResult channel has the text RGB_color appended to it.
Save RGB / Save Alpha – Allows the user 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.
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.
Save V-Ray Image File
The Save V-Ray Image File window is accessible when the V-Ray raw image file option is enabled.
File Name – Specifies the name of the file.
Save as type – Choose as what type of file to save the image. You can specify either a .vrimg, or an .exr file for output:
If you specify a .vrimg extension, the resulting file can be viewed through the File > View image... menu of 3ds Max or loaded in V-Ray Frame Buffer. It can be converted to an OpenEXR file with the help of the VRImg to OpenEXR Convertor tool.
If you specify an .exr extension, V-Ray will write out a tiled OpenEXR file that can be used directly by 3ds Max or other compositing applications. The file contains all render elements for the image.
For either file type, if Lens Effects or the VRayDenoiser render element are enabled, the resulting file contains both the RGB Color channel and effectsResult channel.
Both file formats are multi-channel images, which means that a single output file contains all render elements for the image.
EXR 32-bit output – Enable this option to save the .exr file in a 32-bit output. Note that .vrimg files always contain 32-bit data.
Deep EXR – Enable this option to save the .exr file with a deep output.
Note: Deep Output is only available when rendering with bucket image sampler.
Dot-delimited frame number – Enable this option to add a dot between the file name and the frame number suffix in case an animation is rendered.
Save VFB color corrections to RGB channel – Enable this option to save all applied VFB color corrections to the RGB channel of the output image. This does not apply to the sRGB, Gamma 2.2 and ICC display corrections. OCIO, LUT and Background Image corrections are saved if this is explicitly specified in their VFB rollouts.