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 VRayRawGlobalIllumination Render Element 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 VRayGlobalIllumination by multiplying the VRayRawGlobalIllumination with the VrayDiffuseFilter.
This raw render element must be rendered along with the Global Illumination element ( VRayGlobalIllumination ) for proper results.
UI Path: ||Render Setup window|| > Render Elements tab > Add button > VRayRawGlobalIllumination
This render element is enabled through the Render Elements tab of the Render Setup window in 3ds Max and displays its parameters in a rollout at the bottom of the window:
vrayVFB – 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.
color mapping – Applies the color mapping options specified in the Color mapping rollout of the V-Ray tab in the Render Setup window to this render element. This option is enabled by default.
multiplier – Sets the overall intensity of the render element, where 1.0 is the standard multiplier.
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
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 (VRayGlobalIllumination) as well.