This page gives an overview of the Raw Global Illumination render channel and how it may be used in compositing.
Overview
The Raw Global Illumination Render Channel 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 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 GI by multiplying the Raw GI with the Diffuse.
UI Path
||Node Editor|| > Add > Render Channels > Color Channel > Type > Raw GI
Common uses
Once the scene is rendered, the Raw Global Illumination Render Channel 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
Raw GI x Diffuse = GI
