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The New VFB is much more than a render image holder window. The new enhanced version provides a higher level of post processing adjustments and ability to modify your scene from inside the new VFB. Here is a list of old and new benefits you should know:

  • 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:
    Set Color Corrections to rendered image and its elements;
    Composite mode for Back to Beauty workflow including layers corrections;
    LightMix control on lights contribution in the rendered image;
  • Scene editing:
    Can modify actual lights values by transferring updated intensity and color from LightMix mode;
    IPR camera navigation and focus control from inside VFB;
  • Render management:
    Denoiser control;
    Region rendering control and test resolution;
    Allows you to choose the order in which the buckets are rendered;
    Automatic render resolution adjustment in IPR when the new VFB window is resized;

To use the VFB for rendering, create a V-Ray Renderer node.

New VFB also has some limitations which are listed in the New V-Ray Frame Buffer section below.

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titleUI Path: ||V-Ray Shelf|| > Show VFB
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||V-Ray Shelf|| > Show VFB


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V-Ray menu > Show VFB


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Image Modified

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.

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

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

Removes the selected image from the render history.

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

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The History panel with notes/name, resolution/time, and shortcut key info displayed.

Right

 Right-clicking on an image in the VFB history brings up a pop-up menu with some useful options.

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

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Image Info window 

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The History panel with notes/name, resolution/time, and shortcut key info displayed. Right-clicking on an image in the VFB history brings up a pop-up menu with some useful options.

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

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

Compare V-Ray

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

Copy scene

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path – Copies the full path to the scene.

Copy project

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path – Copies the full path to the project.

Reload

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

 

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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.

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Layers

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The redesigned 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.

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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.

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Deletes the selected layer(s).

Integer mask element – Mask is used with integer render elements like VRayRenderID, VRayObjectID, and VRayMtlID Render Elements.
MultiMatte mask element – Mask is based on the MultiMatte Render Element.
Cryptomatte mask element – Mask is based on the VRayCryptyomatte Render Element.

For more information, see the Layers page.

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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 various actions related to layers such as create, delete, reorder or modify a layer.

Redo various actions related to layers such as create, delete, reorder or modify a layer.

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Each layer has a context menu. Right-click to display it:

 

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Command
Description
ResetResets all changes done to the selected layer.
SaveSaves the layer as a preset.
LoadLoads a preset for the selected layer.
DeleteDeletes the selected layer.
Save as LUTBakes all the color corrections to a LUT file.
New LayerCreates a new layer.
DuplicateDuplicates the selected layer.
Blend ModesSpecifies how the selected layer blends with the result from all layers below it.

 

Stats

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The V-Ray Frame Buffer allows monitoring of different statistics and information about your scene in the Stats panel. The exact contents of the Stats changes depending on the scene,  the rendering mode (interactive vs production, bucket vs progressive) and others.

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Right-click to display a context menu, allowing you to copy the Stats values.

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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:

 

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VFB Shortcuts

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

 

 Shortcut KeyDescription
GlobalShow/hide historyH
Show/hide only layers treeP
Show/hide whole right panelCtr+L
Toggle Full ScreenF11
VFB SettingsS
History/Render ViewEnable history A/B/C/D compare modeE
Enable history A/B horizontal compare modeQ
Enable history A/B vertical compare modeW

Load the respective image from the new VFB history (1...9)

1; 2; 3; 4; 5; 6; 7; 8; 9
Layers/Property PanelRedoCtr+Y
UndoCtr+Z
LayersDelete a layerDel
Render View  Abort renderingEsc
Copy current channel to clipboardCtr+C
Load imageCtr+O
Lock pixel info coordinatesL
Pan image (up, left, down, right)Up; Left; Down; Right (arrow keys)
Switch to Alpha channelA
View blue channelB
View green channelG
View next channelPgDown
View previous channelPgUp
View red channelR
Zoom 100%* ; Double-click left button
Zoom in+ / =
Zoom out-/_
Zoom to fitF
Zoom in the rendered imageCtrl+Shift+Left click
Zoom out the rendered imageCtrl+Shift+Right click
Symmetric render region resizingAlt+resize
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Note that the keyboard shortcuts work only within the VFB window.

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The shortcut keys can be modified in the VFB's options from VFB > Options > Shortcuts tab > Edit hotkeys.

 

Render Region

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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.

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