Mathias Agopian da73f89a23 improve/simplify "Focus on shadow casters" algorithm ...

Functionally this shouldn't be too different, but we have some
improvements:
- better detection of "no shadows" cases
- more computations done in light-space, which should result in
  better light frustum.
- spit the code into several static functions

2023-09-19 14:15:52 -07:00

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