Unable to generate indirect light rays on almost any level
On any level with more than one or two meshes and/or some custom materials, Lightmass reports:
and fails to bake any indirect lighting. I've tried numerous times to reset every possible lightmass settings, but I can't find any reason behind this.
Furthermore, it appears to always work with built-in engine materials, and sometimes it works with any built-in engine material and one custom material, but will not work with one or two custom materials reliably.
To test this, I even created a stupidly simple level with two planes 300 units apart, facing each other, representing a floor and a ceiling. I placed a bright spotlight facing the floor. Additionally, I created a blank material with its base color set to white.
I should expect to see the spotlight reflected off the pure-white ground and onto the ceiling, back again, and so forth.
However, I don't see that. I see nothing, because it gathers zero indirect photon paths, for some reason. If I revert all meshes back to their default
I've built lighting so many times over the past two days trying to figure this out before a deadline that I can't remember if I had any successful lighting builds after updating to 4.20, but for the same levels this issue never occurred in 4.19.
I cannot think of a reason for this. This is absurd.
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