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bALLZNPLAY
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There's a checkbox in the Appearance options. Static lights will use one shadow map for all static objects, and another for dynamic objects. This can greatly reduce the amount of shadow polygons that have to be drawn when an object moves:
https://www.ultraengine.com/learn/Entity_Staticize

API_Entity_MakeStatic.gif

In that example, only the spinning fan has to be drawn when the shadow is updated each frame. The rest of the scene is just copied from the static shadow map. id Tech does something similar to this, I think.

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