The Shadow Render Element is a color image that works as a reverse mask for shadows and can be used to lighten, darken or tint shadows. Shadows can be lightened in the composite by adding this pass, or darkened by subtracting this render pass from the final composite.
The VRayShadows render element is the product of multiplying the vrayRE_Raw_Shadow Render Element with the vrayRE_Diffuse Render Element in the composite.
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Specific objects can be excluded from this Render Element by disabling the Generate Render Elements option in the VRayObjectProperties node for the selected object(s).
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.
