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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	Start interactive rendering – Starts IPR. Abort rendering – Stops the current rendering. Render – Starts 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 – 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 adjusts settings for Render View, Render Region, History and Layers.

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	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 New V-Ray Frame Buffer section for more information.
	Starts IPR. If there is more than one camera in the scene, hold left mouse button to display a list of the available cameras.
	Stops the current rendering.
	Starts rendering. If there is more than one camera in the scene, hold left mouse button to display a list of the available cameras.

Render History

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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.

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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

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The History panel

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

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Image Removed

Right

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

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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 scene in the viewport. This option works as long as the initial file path of the scene has not changed after the render.

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

Copy project path – Copies the full path to the

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project.

Reload history – Re-reads the history image list. This may be needed if the history folder is updated outside of Houdini (f.e. 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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Image Added

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.

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

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

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

Image Added

Command	Description
Reset	Resets all changes done to the selected layer.
Save	Saves the layer as a preset.
Load	Loads a preset for the selected layer.
Delete	Deletes the selected layer.
Save as LUT	Bakes all the color corrections to a LUT file.
New Layer	Creates a new layer.
Duplicate	Duplicates the selected layer.
Blend Modes	Specifies 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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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:

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Shortcut Key	Description
Double-click left button	Zoom to 100%
Ctrl+Shift+Left click	Zoom in the rendered image
Ctrl+Shift+Right click	Zoom out the rendered image
+ / =	Zoom in
-/_	Zoom out
*	Zoom to 100%
Arrow keys	Pan left, up, right, down
F	Fit region or whole image in the VFB
Esc	Abort render
Q	Enable history A/B vertical compare mode
W	Enable history A/B horizontal compare mode
E	Enable history A/B/C/D compare mode
1-9	Load the respective image from the new VFB history
H	Show/hide history
Ctr+L	Show/hide whole right panel
P	Show/hide only layers tree
L	Lock pixel info coordinates
Alt+resize	Symmetric render region resizing

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Note that the keyboard shortcuts work only within the VFB window.

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Content

Space Tools

Versions Compared

Old Version 2

New Version 3

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Render History

Layers

Stats

VFB Shortcuts