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This page provides information on the New V-Ray Frame Buffer and its features.

Overview


The New V-Ray Frame Buffer (VFB) is a second-generation V-Ray virtual frame buffer.

The New VFB is much more than a render image holder window, with Light Mix capabilities for modifying the project lighting after rendering and Layer Compositing for a higher level of post-processing adjustments.

  • Image preview:
    Loads render elements channels via a dropdown list;
    Works with display corrections;
    Loads various 8bit and 32bit file formats, including V-Ray resumable files;
    Image comparison between 2 or 4 renders;
  • Image management:
    Keeps the rendered image in full 32-bit floating-point format;
    Can store history of rendered images with their post rendering corrections;
    Can save corrected output to various image formats;
  • Image editing and post-processing:
    Add Color Corrections to rendered image and its elements;
    Layer Compositing for anything from a simple Back to Beauty workflow or advanced compositing;
    LightMix adjustment of the project lighting after rendering the image;
  • Project editing:
    Can modify actual lights values by transferring updated intensity and color from LightMix mode;
  • Render management:
    Denoiser control;
    Region rendering control and test resolution;
    Allows you to choose the order in which the buckets are rendered.

 

UI path: ||V-Ray Toolbar|| > Show/Hide Frame Buffer button

 

 

VFB Menu


The V-Ray Frame Buffer menu holds the main frame buffer commands. Some of the options are also available in the VFB toolbar for quick access.

 

Menu

Menu Options

File

Save current channel – Saves the currently loaded channel to an image file format.

Save all image channels to separate files – Saves all the render elements to separate files.

Save all image channels to single file – Saves the image to a single multi-channel EXR or .vrimg file.

Load image – Opens an image file to be previewed in the V-Ray Frame Buffer.

Render

Abort rendering – Stops the current rendering.

Render – Starts Production Rendering.

Image

Follow mouse – Renders the closest bucket found to the mouse pointer, when using the bucket image sampler. If the progressive sampler is used, V-Ray samples the closest pixels to the mouse pointer.

Follow mouse – Drag the mouse over the VFB while rendering to change what part of the image is sampled first;
Follow mouse (locked) – Locks the bucket (or sampling) starting point.

Copy current channel to clipboard – Copies the current channel to the clipboard.

Clear image – Clears the contents of the frame buffer. This is useful when starting a new render to prevent confusion with the previous image.

View

Display color space –Specifies the color space, in which the image is displayed.

None – Does not specify a color space;
sRGB – Displays the image in sRGB color space;
OCIO – Displays the image in a color space loaded from an OCIO configuration file;
ICC – Displays the image in a color space loaded from an ICC configuration file;
Gamma 2.2 – Displays the image in Gamma 2.2 color space.

Zoom VFB – Zooms in/out the rendered image in the VFB.

Zoom 50% – Zooms out to 50%;
Zoom 100% – Zooms to 100%. Alternatively, double-click in the VFB with the left mouse button;
Zoom 150% – Zooms in to 150%.
Zoom to fit (F)Zooms the current image to fit in the VFB. If Render Region is active – zooms to the region.

Channels – Chooses which channels to see.

View red channel – Displays the red channel;
View green channel – Displays the green channel;
View blue channel – Displays the blue channel;
Switch to alpha channel – Displays the alpha channel;
Monochromatic mode –Displays the image in monochromatic mode.

Color clamping – Opens the color clamping submenu options:

Force color clamping – Forces color clamping;
View clamped colors – Displays the clamped colors.

Use pixel aspect – Enables visualization of the pixel aspect ratio.

Stereo – Enables stereoscopic preview. You can view the image in stereo in red/cyan or green/magenta.

Options

VFB settings – Opens the VFB Settings window where you can adjust settings for Render View, Render Region, History, and Layers.


VFB Toolbar


This dropdown gives access to render elements rendered for the project. The selected render element is displayed in the VFB. By default, the RGB color and Alpha render elements are available. Any additional render elements that have been added to the project also appear in the drop-down.

Displays the coordinates of the mouse pointer.

Specifies the sampled area size. Click on the arrow to open a context menu with the available sampled area sizes: 1x1, 3x3, 5x5, and 7x7.

Specifies whether color and display corrections are applied (RGB) or not (Raw) when showing the sampled pixel values at the current mouse pointer position.

Displays the RGB pixel values at the current mouse pointer position before applying any color corrections.

Specifies RGB values. Click on the arrow to open a context menu with the available option.

None – Does not specify the RGB value.
HSV – Specifies the Hue, Saturation, and Value of the pixel under the current mouse position.
Web – Specifies the HEX of the pixel under the current mouse position.
8bit – Specifies the 8bit color palette of the pixel under the current mouse position.

Displays the Hue, Saturation, and Value of the pixel under the current mouse position when HSV is selected.

Displays the HEX of the pixel under the current mouse position when Web is selected.

Displays the 8bit color palette of the pixel under the current mouse position when 8bit is selected.

Locks the mouse pointer coordinates and displays information for the selected pixel.

Shows corrected colors.

Shows the V-Ray log.

Displays the Alpha channel.

Saves the image to disk. Press and hold the icon to bring up the submenu:

Save current channel – Saves the current channel to an image file format;
Save all image channels to separate files – Saves all the render elements into separate files;
Save all image channels to single file – Saves the image into a single multi-channel EXR or .vrimg file.

Clears the contents of the frame buffer. This is useful when starting a new render to prevent confusion with the previous image.

Renders the closest bucket found to the mouse pointer, when using the bucket image sampler. If the progressive sampler is used, V-Ray samples the closest pixels to the mouse pointer. With this option enabled, you can right-click on the image and select Lock bucket starting point to lock the bucket (or sampling) starting point.

Allows you to render regions in the VFB. See the Render Region section for more information.

Stops the current rendering.

Starts Production Rendering.


Render History


The V-Ray VFB keeps a history of previously rendered images, and lists each with a number, thumbnail, and textual details in the Render history panel. Up to four images can be called from the history to be compared in the VFB (as shown below). History files are stored as .vrimg files in a user-specified folder. Render history settings can be configured in the VFB Settings window.

 

 

 

 

 

Saves the current image from the VFB to the render history. The image is placed at the top of the render history list.

Enables or disables image A/B vertical comparison. Select images A and B from the render history.

Enables or disables image A/B horizontal comparison. Select images A and B from the render history.

Enables or disables image A/B/C/D comparison. Select images A, B, C, and D from the render history.

Loads the selected image from the render history to the VFB.

Removes the selected image from the render history.

A search field where you can filter the images based on the project's paths and notes.

 

 

The keyboard keys from 1 to 9 can be used to quickly load the first 9 images from the history to the VFB.

Edit note – Allows you to add a text comment to the image; the comment appears below the image.

Set A – Sets the render as A image for A/B comparison.

Set B –  Sets the render as B image for A/B comparison.

Load to VFB – Loads the selected image in the VFB (same as double-clicking on the image).

Delete – Deletes the selected image from history. The image is moved to the system's Recycle Bin and can be restored from there if needed.

Load layers – Loads the layer tree preset of the selected image.

Load V-Ray settings – Loads the V-Ray settings used for the  saved render.

Compare V-Ray settings – Opens the Compare V-Ray settings dialogue, where you can compare the render settings of saved renders.

Open scene – Opens the rendered project in the viewport. This option works as long as the initial file path of the project has not changed after the render.

Copy scene path – Copies the full path to the project.

Copy project path – Copies the full path to the project.

Reload history – Re-reads the history image list. This may be needed if the history folder is updated outside of 3ds Max (e.g. from another Revit session).

Manually saved .vrimg files can also be added to the History folder, but they need to be saved with all image channels in one .vrimg file to keep the complete image info.

 


Layers


The New V-Ray Frame Buffer includes a suite of color corrections and tools for adjusting the image. The tools are added as layers and displayed in a layer tree. You can enable or disable a particular tool using the visibility icon () to the left of its name.

For more information on using the Layers, see the Layers page.

 

 

 

 

 

Creates a layer. Multiple layers of the same type can be added.

Folder – Allows grouping multiple layers;
Background – Adds a background color correction layer;
Render Element – Selects a render element from your image that you can use in compositing. This is only available when the Source layer is set to Composite;
Constant – Adds a solid color that can be used to achieve an effect on another layer (for example to multiply by the constant);
Exposure – Adds an Exposure color correction layer;
White Balance – Adds a White Balance color correction layer;
Hue/Saturation – Adds a Hue/Saturation color correction layer;
Color Balance – Adds a Color Balance color correction layer;
Curves – Adds a Curves color correction layer;
Lookup Table – A Lookup Table layer allows loading a LUT file for color transformations;
Filmic Tonemap – Contains different types of mapping curves and gamma corrections. Also allows selection of a color space.

For more information, see the Layers page.

Deletes the selected layer(s).

Saves a layer tree preset.

Loads a layer tree preset.

Quick access to custom layer presets. You must set the path to it in the VFB Settings.

Undo create layer.

Redo create layer.

 

Stats


The Stats section provides track reports about the project, the engine, the devices, the performance, and the memory.

Memory tracking is always enabled and there is no need for configuration.

 

 

 

 

VFB Shortcuts


These shortcuts navigate through the VFB image. Please note that the VFB window must have the current focus for the shortcuts to have effect:

 

MouseDescription
Mouse wheelZoom in/Zoom out
Double-click left buttonZoom to 100%
Page Up/Page DownSwitch between render elements
MMB draggingPan (hand tool)
Ctr+Shift+LMBZoom in
Ctr+Shift+RMBZoom out
  
KeyboardDescription
+ / =Zoom in
-/_Zoom out
*Zoom to 100%
Arrow keysPan left, up, right, down
FFit the region or the whole image. Available only if the render region option is used.
EscAbort render
QEnable history A/B vertical compare mode.
WEnable history A/B horizontal compare mode.
EEnable history A/B/C/D compare mode.
1-9Load the respective image from the VFB history
HShow/hide history
Ctr+LShow/hide whole right panel
PShow/hide only layers tree
Alt+resizeSymmetric render region resizing
LLock pixel info coordinates

 

*MMB - Middle mouse button
LMB - Left mouse button
RMB - Right mouse button

 

Render Region


Region rendering can be used in both IPR and Production modes to isolate only part of the frame for rendering. Usually, when a render region is used, you would like to save the whole frame instead of the region only.

When saving single-channel .exr  files, the render region is ignored and a full frame is always saved. This applies when saving the .exr  through VFB.

Saving multi-channel .exr files writes just the render region data in the file by default but it can be set to save full frame instead. In order to save the render region with the rest of the frame, set its exr data window option to Whole Image. Saving multi-channel .exr files from VFB > Save all channels to single file saves the render region when it is enabled from the VFB. This happens even if you have selected a render region on top of the already rendered frame, without an actual region used in the rendering process. To save the full frame from VFB, disable the render region.

 

Notes


  • The OpenEXR file format is an open file format for high dynamic range images originally developed by Industrial Light and Magic. The official site of the OpenEXR file format is http://www.openexr.com/
  • If Lens Effects or the Denoiser render element are enabled, then the RGB Color channel is saved with the name RGB_color and the effectsResult channel is saved as effectsResult when saving all channels from VFB.
  • If an 8-bit file is saved through the VFB or the Render Output / Save image settings, the color space (for example sRGB) is embedded and the image appears as in the frame buffer when loaded in an external image viewer. If a 32-bit (exr, hdr, tif) image is saved, it remains linear and relies on the external image viewer to handle the display color space.
  • Global Color Correction files (*.vccglb) from the old VFB cannot be loaded in the new V-Ray Frame Buffer.