How frequently shadow maps are generated in unity? what factors decide to recalculate the depth pass?
Shadow maps and the camera depth texture are updated every frame.
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Shadow maps are rendered every frame. However, Unity 5.6 I think have a precomputed shadow map mode, where for static lights and geometry the shadow maps are pre-computed, and only the dynamic objects need to be rendered into the shadow map. This should make it quite a lot faster.
Yes, there’s the new shadowmask stuff that’s effectively an advanced lightmap where the shadows of static objects from static lights can be pre-baked into a special lightmap.