The function `has_surface_transparent()` needs to be implemented in order for hair with elliptical cross-sections to work correctly with MIS. Pull Request: https://projects.blender.org/blender/blender/pulls/116088
The function `has_surface_transparent()` needs to be implemented in order for hair with elliptical cross-sections to work correctly with MIS. Pull Request: https://projects.blender.org/blender/blender/pulls/116088