The Global Illumination (GI) Render Element is a color image that stores indirect lighting information coming from reflected diffuse light in a scene ( without direct light and reflection contributions) when Indirect Illumination (GI) is enabled. This element may be used directly in Back to Beauty compositing and adjusted for brightness and color to control the final image easily.

For even more control of indirect illumination without rerendering the scene, the Global Illumination (GI) render element may be re-assembled by multiplying the V-Ray Raw GI Render Element by the Diffuse Render Element:

V-Ray Raw GI x V-Ray Diffuse = V-Ray GI

The Global Illumination Render Element is useful for changing the appearance of Indirect lighting after rending in a compositing or image editing software. Below are a couple of examples of its use.

Global Illumination Render Element

Original Beauty Composite

Brightened GI

Tinted and Brightened GI

Compositing Formula

V-Ray Raw GI x V-Ray Diffuse = V-Ray GI