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Should the camera clear the stencil buffer after the deferred light pass?
When using Deferred Shading or Legacy Deferred Lighting, the G-buffer and lighting passes use the stencil buffer.
By default contents of the stencil buffer are preserved (not cleared) and end up containing information related
to lights. Setting this property to
stencil be cleared to zero after the deferred light pass is done.
Typically if you're using deferred shading camera and UI elements with Masks (see UI.Mask), you'll want the stencil buffer to be cleared.