Cascaded shadow maps for directional lights #411
Merged
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Shadows were previously broken for large scenes, here the robots in the back have them but not the robots in the front:

This PR fixes this using cascaded shadow maps:

Ideally we would import three.js's built-in CSM module (based on StrandedKitty/three-csm), but there's a minor upstream bug that prevents this. I mirrored the whole module over for now, but we can clean this up when the next three.js release happens. Context: mrdoob/three.js#30771
Fixes #400