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 .
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This raw render element must be rendered along with the Global Illumination element (vrayRE_Gl) for proper results.
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UI Path: ||Display Render Settings button|| > Render Elements tab > Raw GI
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To use render elements, select from the Available render elements column and click the Add button to add the passes you wish to generate at render time. When you render the scene, the added render elements listed in the column on the right, will also render, which can be viewed from the VFB window's channel drop-down menu.
For more information on the parameters on this dialog, see the Render Elements tab page.