Fixes#18809.
The in-editor ortho camera used a far clipping plane of 8192 units, and was
placed 4096 units away from the camera cursor.
This was far enough to cause culling issues from floating point precision loss
on objects smaller than one unit.
This change modifies the near/far clipping planes of the ortho camera to use
those specified in the editor (and currently used by the perspective camera).
The frustum is still centered around the camera cursor location, as it was
before.
(cherry picked from commit 26912c15e6)
- Made shadow bias size independent, so it will remain when changing light or camera size.
- Implemented normal offset bias, which greatly enhances quality.
- Added transmission to subsurface scattering
- Reimplemented shadow filter modes
Closes#17260
