This page gives an overview of the Raw Global Illumination render element and how it may be used in compositing.
Overview
The Raw Global Illumination Render Element stores how much indirect lighting (reflected diffuse light) is received by surfaces in the scene. This raw element is useful for fine-tuning indirect lighting in the compositing process.
The vrayRE_Raw_GI pass is untouched by the diffuse colors of the scene and represents the pure indirect lighting contribution. You can use this raw element to reconstitute the vrayRE_GI by multiplying the vrayRE_Raw_GI with the vrayRE_Diffuse .
This raw render element must be rendered along with the Global Illumination element (vrayRE_Gl) for proper results.
To use render elements, select from the Available render elements column and click the Add button to add the passes you wish to generate at render time. When you render the scene, the added render elements listed in the column on the right, will also render, which can be viewed from the VFB window's channel drop-down menu.
For more information on the parameters on this dialog, see the Render Elements tab page.
Attributes
The parameters for this render element appear in the Attribute Editor under Extra V-Ray Attributes.
Enabled – When enabled, the render element appears in the V-Ray Virtual Frame Buffer.
Deep output – Specifies whether to include this render element in deep images.
Filename suffix – The text added to the end of the rendered file, when saved as a separate file (e.g. myrender.rawGI.vrimg).
Apply color mapping – Applies the color mapping options specified in the Color mapping rollout of the VRay tab in the Render Settings window to this render element. This option is enabled by default.
Denoise – Enables the render element's denoising, provided the Denoiser render element is present
Common uses
Once the scene is rendered, the Raw Global Illumination Render Element is useful for changing the appearance of indirect lighting in a compositing or image editing application. Below are examples of its use.
Raw Global Illumination Render Element
Original Beauty Composite
Raised Raw Global Illumination Render Element
Raised and tinted Raw Global Illumination Render Element
Brightened GI
Tinted and Brightened GI
Underlying Compositing Equation
vrayRE_Raw_GI x vrayRE_Diffuse = vrayRE_GI
Notes
When Raw Global Illumination is needed in composite, please make sure to also render the Global Illumination render element (vrayRE_GI) as well.
- There is initial support for Raw GI render element on V-Ray GPU.