Fix `NaN` in the light tree `bcone.axis` that can occur when normalizing direction vectors of 0 length. Pull Request: https://projects.blender.org/blender/blender/pulls/110374
Fix `NaN` in the light tree `bcone.axis` that can occur when normalizing direction vectors of 0 length. Pull Request: https://projects.blender.org/blender/blender/pulls/110374