This page gives an overview of the Raw Global Illumination render element and how it may be used in compositing.
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.
UI Path: ||Render Settings window|| > Render Elements tab > Raw GI
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).
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 a 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
Tinted and Brightened GI
Underlying Compositing Equation
When Raw Global Illumination is needed in composite, please make sure to also render the Global Illumination render element (vrayRE_GI) as well.