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s there a reason why you can’t do so for sky and directional lights? Also the lights require to be set to dynamic in order for cached shadowmaps to work. Might it not be an idea to have all lights set to static and only have specified objects cast cached dynamic shadows instead?
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Directional light shadowmaps (CSM) are view dependent and require a complex scrolling approach to properly cache them. Plus directional light shadows are often combined with WPO animated foliage which can’t be cached, so it’s lower in priority.
Skylights don’t use shadowmaps.