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Overview

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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 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 Raw GI with the Diffuse.

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This raw render element must be rendered along with the Global Illumination element (Gl) for proper results.


UI Path: ||out Network||> V-Ray Render Elementsnode> V-Ray > Render Channel > V-Ray Color Channel (RE) > Type > Raw GI

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Attributes

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The parameters for this render element appear in the V-Ray RenderChannelColor render channels node.

Deep Output – Specifies whether to include this render element in deep images.

Color Mapping – When enabled, the Color Mapping options in the render settings are applied to the current render channel.

Consider For AA – When enabled, anti-aliasing is used where possible.

Filtering – Applies the image filter to this channel. Image filter settings are in the Image Sampler tab of the Sampler tab of the V-Ray Renderer node.

Denoise – Enables the render element's denoising, provided the V-Ray Denoiser render element is present.

Derive Raw Channels – Generates data in the raw channels by combining the respective color and the filter color channels.

VFB Color Corrections – Applies the post render color adjustments made from the VFB.

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This render element is not supported with V-Ray GPU rendering.

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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.

 

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Raw Global Illumination Render Element

 

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Original Beauty Composite

 

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See the Raw Global Illumination before and after editing and the resulting images.

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Raised Raw Global Illumination Render Element

 

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Raised and tinted Raw Global Illumination Render Element

 

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Brightened GI

 

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Tinted and Brightened GI

 

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V-Ray Raw Global Illumination

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Original Beauty composite

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V-Ray Raw Global Illumination edited

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Beauty composite edited

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Underlying Compositing Equation

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Raw GI x Diffuse = GI

 

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Notes

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  • When Raw Global Illumination is needed in composite, please make sure to also render the Global Illumination render element (vrayRE_GI) as well.

  • This render element is not supported with V-Ray GPU rendering.