This page contains information on the layer tree presets found in the V-Ray Frame Buffer 2.
Overview
The V-Ray Frame Buffer 2 includes a suite of color correction and render elements tools for adjusting the VFB image before saving to disk. These tools are grouped into layers that are displayed in a window docked to the right side of the VFB.
UI Path
||V-Ray Frame Buffer|| > Layers
Layers Tools
The Layers window is equipped with icons for a quick access to some basic functionalities, as well as with a layer tree preset list where you can control color corrections and render elements.
Creates a layer. Right-click to open the context menu options: Folder – Allows grouping of layers in folders. | |
| Deletes selected layers. | |
| Saves the layer tree preset. | |
| Loads layer tree preset. | |
| Displays a list of layer presets. |
Some of the corrections are applied only when the image is displayed on the screen, and are not applied when the image is saved to disk. Corrections intended mostly for display purposes, such as sRGB and ICC color corrections, are not saved to disk.
Corrections are generally applied as they are listed in the layers window from bottom to top, except for nested layers that are executed after their parent. The only exception is white balance correction, which is always applied first. In other words, white balance corrections are made first, followed by exposure, hue/saturation, etc. Display color corrections like LUT, OCIO, and ICC are applied last.
You can enable or disable a particular color correction using the visibility icon () to the left of its name.
Source
In the Source layer, you can configure render elements and lights. If you do not want to configure any of them, set the source to RGB to show the RGB channel in the VFB.
When the Source is set to Composite, you can modify them into a Back to beauty composite.
When the Source is set to LightMix, You can enable/disable lights from their respective checkboxes or modify them using the intensity parameter and the color slots. The modifications can be saved as light mix presets and be re-used.
| Saves/applies the changes to the scene. This sends all changes to colors/intensities back to the scene lights. A re-render is needed for those changes to be properly integrated in the render output. | |
| Saves the changes as light mix preset. | |
| Loads a light mix preset. | |
| Shows a list of recent light mix presets. |
Parameters
Name – Specifies the name of the layer.
Opacity – Controls the weight of the respective correction. Use the slider to set the value, where a value of 0 means no effect and a value of 1.0 means full effect.
Blend Mode – Specifies the blend mode from the following options:
Normal
Average
Add
Substract
Darken
Multiply
Color Burn
Linear Burn
Lighten
Screen
Color Dodge
Linear Dodge
Spotlite
Spotlite Blend
Overlay
Soft Light
Hard Light
Pin Light
Hard Mix
Difference
Exclusion
Hue
Saturation
Color
Value
Denoiser
A VRayDenoiser render element must be added in the Render Setup > Render Elements for the Denoiser layer to be activated. Here you can enable/disable VRayDenoiser in the VFB and control its behavior.
When using the Default V-Ray denoiser, the presets can be used to automatically set the strength value.
The GPU device(s) can be used to accelerate the denoising calculations. In case there is no compatible GPU device, denoising automatically falls back to use the CPU, even if the Hardware accelerate option is enabled. When the NVIDIA AI denoiser is used, this option is not available.
Constant
This color correction applies a color that can be used as a constant to multiply another layer, i.e to boost it.
Exposure
This color correction applies exposure and contrast to the image. An Exposure value of 0.0 leaves the original image brightness, +1.0 makes it twice as bright, and -1.0 makes it twice as dark. Highlight Burn selectively applies exposure corrections to highlights in the image. Positive Contrast values push the colors away from the medium gray value to increase image contrast, while negative values push the colors closer to medium grey.
White Balance
The White Balance (Temperature) slider corrects the colors in the image so that objects that are white appear as pure white (and not tinted blue, yellow, red, etc.) in the final image.
Hue/Saturation
This correction applies HSL transformation on the image colors. Moving the Hue slider changes the overall hue of the image colors (grey colors remain intact). Lower Saturation values move the image towards greyscale while higher values increase the colors' intensities. Higher Lightness values add white to the image, whereas lower values subtract white from the image.
Color Balance
This correction adjusts the overall color tone of the image, as well as the tone of the dark (shadow), medium, and bright (highlight) colors. The color corrections are additive in that the All correction affects all colors of the image, and the Shadows/Midtones/Highlights options adjust the individual components in the image on top of the All correction.
Lockup Table
This correction allows you to remap the image colors based on an IRIDAS .cube LUT (Look-Up Table) file.
This correction can be controlled with environment variables. Settings VRAY_VFB_LUT=1 automatically turns on the LUT correction by default. A LUT file can be specified with the VRAY_VFB_LUT_FILE environment variable.
Convert to Log Space Before Applying LUT – Converts the Base map to a logarithmic color space before applying the look-up table.
Convert to sRGB Space Before Applying LUT – Converts the Base map to a sRGB color space before applying the look-up table.
Notes
- Color corrections are applied to all Beauty render elements and some Utility render elements too. They are not applied to render elements that present masks or hold geometry or computational data for the rendered frame.