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When you assign a map to object shadows in the light's Shadow Parameters rollout, the mental ray renderer does not recognize the toggle for the map (to the left of the Map button), and renders the map whether the toggle is on or off.(The Exclude button is on a light's General Parameters rollout.) To exclude objects from shadow casting, use ray-traced shadows. Excluding an object from shadow casting doesn't work when you use mental ray to render shadow-mapped shadows.To use Overshoot, use ray-traced shadows. The Overshoot parameter for lights doesn't work when you use mental ray to render shadow-mapped shadows.When you set up a scene for rendering with the mental ray renderer, keep the following tips in mind: Using Lights with the mental ray Renderer