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The Layers panel in V-Ray Frame Buffer provides a new powerful workflow for making adjustments to your rendered image. You can bring out render elements and compose them together with individual color corrections in the panel's Composite mode, or deconstruct light contribution in the scene and fine-tune each light individually in the completed render using the VRayLightMix mode. You can also color correct the final render just like you were able to do in the previous version of VFB.

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Layers Menu

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Commands available for the Layers panel are located at the top of the panel. Press on the icons to see the expanded list of commands for the stacked buttons.

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

Folder -  – Allows grouping multiple layers in folders. This is only available when the Source layer is set to Composite;
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 -
Vignette – Adds a vignetting effect to the image.
ICC Profile – The ICC correction allows you to apply an ICC profile to the image, so that (for example) it matches the appearance of the image in Adobe PhotoShop.
Filmic Tonemap – Contains different types of mapping curves and gamma corrections. Also allows selection of a color space.
Lookup Table – A Lookup Table layer allows loading a LUT file for color transformations.
Curves – Adds a Curves color correction layer.
Color Balance – Adds a Color Balance color correction layer.
Hue/Saturation – Adds a Hue/Saturation color correction layer;.
Color White Balance -  – Adds a Color White Balance color correction layer;.
CurvesExposure – Adds a Curves an Exposure color correction layer;
Lookup Table - 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.
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Constant – Adds a solid color that can be used to achieve an effect on another layer (for example to multiply by the constant).
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.
Background – Adds a background color correction layer.
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.
Image alpha mask – Mask is based on the rendered Alpha channel.
Cryptomatte mask element –   – Mask is based on the VRayCryptyomatte the VRayCryptyomatte Render Element.
Proportion Guide – Adds Guides – Adds a proportion guide layer.


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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Input color space – Specifies the input color space for the image; normally this is a linear color space as V-Ray internally works in that space.

Display Device – Specifies the device on which the VFB with the image is displayed.

View Transform – Specifies the viewing transformation.

Save in image – Saves/bakes the OCIO effect along with the image. This does not affect multi-channel images (such as multi-channel .exr).

VFB OCIO configuration can be controlled from within the Houdini UI through Python. Learn how to do so in the VFB OCIO Control through Python tutorial.

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ICC

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Profile cached – When loading an ICC file, this checkbox indicates whether the file is smaller or bigger than a given threshold of 64k. If the file is smaller than 64k, the checkbox is ticked to indicate that the ICC file is directly embedded in the scene. If the loaded file is bigger than 64k, the checkbox is inactive which indicates that you must either put the ICC file in the Houdini project folder, or set the correct path to load it.

Rendering Intent – Specifies an ICC color replacement scheme. You can choose from Perpetual, Relative colorimetric, Absolute colorimetric, and Saturation.

Back Black point compensation– Enables back black point compensation.

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This is a method of creating adjustments between the maximum black levels of digital files and the black capabilities of various digital devices.

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ICC Profile

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The ICC profile layer provides all options of the Display Correction ICC mode. On top of that, as a layer it can be blended with the other layers.

Profile cached – When loading an ICC file, this checkbox indicates whether the file is smaller or bigger than a given threshold of 64k. If the file is smaller than 64k, the checkbox is ticked to indicate that the ICC file is directly embedded in the scene. If the loaded file is bigger than 64k, the checkbox is inactive which indicates that you must either put the ICC file in the Houdini project folder, or set the correct path to load it.

Rendering Intent – Specifies an ICC color replacement scheme. You can choose from Perpetual, Relative colorimetric, Absolute colorimetric, and Saturation.

Back Black point compensation– Enables back black point compensation. This is a method of creating adjustments between the maximum black levels of digital files and the black capabilities of various digital devices.

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This layer provides access to the VRayDenoiser render element (if available) from inside the VFB. To enable the layer, add a VRayDenoiser before rendering.

Calculate denoiser – Enables/disables the denoiser calculation. This can be useful sometimes while adjusting your render. Disabling the denoiser layer visibility instead still calculates the denoiser in the background. Read more about this working with the denoiser on the V-Ray Denoiser page.Update – Updates the Denoiser layer manually and also initiates a Lens Effects updatethe denoiser calculation. This can be useful sometimes while adjusting your render. Disabling the denoiser layer visibility instead still calculates the denoiser in the background. Read more about this working with the denoiser on the V-Ray Denoiser page.

Update – Updates the Denoiser layer manually and also initiates a Lens Effects update.

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Vignette

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This layer adds a vignetting effect to the image. Its settings can be controlled through the layer's parameters or directly from the overlay handles visible in the VFB.

Preview as mask – Shows a preview of the mask applied for the vignette effect.

Size – Determines how much of the image's edge is affected by the vignette effect.

Feather – Controls the sharpness of the vignette's edge. Lower values create a sharper transition, while higher values produce a softer, more gradual effect.

Rotation – Rotates the Vignette layer.

Inverted – Inverts the Vignette effect.

Smoothness – Controls the smoothness of the Feather effect.

Aspect ratio – Provides manual control over the aspect ratio when the Match image aspect is disabled.

Match image aspect – Corresponds to the currently loaded image aspect ratio. This option is enabled by default.

Horizontal center offset – Offsets the vignette effect horizontally.

Vertical center offset – Offsets the vignette effect vertically.

Color – Changes the color of the vignette effect.

Show handles – Controls the preview of the UI handles.

Always – Always displays the handles.
Auto – Display the handles only on image hover.
Never – Never displays the handles.

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Background

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This section allows you to load an image and use it as a background for your rendering.

Load – Loads a file that is going to be used as a background.

Stretch – Controls the aspect ratio of the image by stretching the image to fit the VFB.

Fit – Keeps the aspect ratio of the image. Enlarges or shrinks the VFB to fit the image.

Fill – Keeps the aspect ratio of the image and cuts some parts of the picture to fill the VFB.

Horizontal offset – Specifies a horizontal offset.

Vertical offset – Specifies a vertical offset.

As foreground – When enabled, the image loaded in the field above is used as a foreground. This means that the image is on top of the rendering and you are able to see the rendering only if the image has an alpha channel.

Save in image – When enabled, saves the layer to the image.

Color transformation – Allows display corrections to be applied to the Background layer independently.

Auto – Recognizes what the desired transformation would be based on the image suffix (_srgb, _lin_srgb, _acescg...) and sets those settings automatically.

Manual – Allows manual setup of the color transformation options. The options can be left at Auto and be determined automatically by V-Ray. The options can be set to None and apply no transformations.

RGB color space – Chooses which color space to use for the color transformations. sRGB is the color space for most monitors and computer displays. ACEScg allows for greater range of color transformations in post. It has a wider gamut of colors than the sRGB linear gamut.

Transfer function – Alters the pixel values to a new range. Gamma 2.2 is the standard for most monitors.

OCIO – Allows an Input color space to be selected when an OCIO profile is already loaded. OCIO profiles can be loaded either through the Display Correction layer or through the OCIO environment variable.

Input color space – Determines the input color space for the background image; normally this is a linear color space as V-Ray internally works in that space.

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Note that when the Use VFB Background Image option (Renderer ROP > Images tab) is enabled, it overrides the VFB Background layer.

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