The Raw Shadow Render Element stores information about cast shadows calculated from the lighting in the scene. It is a "reverse" image in the sense that white areas indicate shadows while black areas indicate no shadow.
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UI Path: ||Display Render Settings button|| > Render Elements tab > Raw Shadow
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||Display Render Settings button||> Render Elements tab > Raw Shadow
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Render (menu) > Render Settings > Raw Shadow
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.
