-fast is better than -ldr on thin surfaces??

Collaide

L2: Junior Member
Oct 14, 2015
58
3
I'm having a really strange issue with lighting.

On really small/thin surfaces the lighting can appear black (LDR, full), but the same surfaces can appear normally when doing a -fast compile.

This is a side-to-side comparison:
unknown.png
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I have some minor errors in the compile log but it's all related to displacements.
I really don't understand why fast lighting would do a better job of lighting these surfaces up.
As I'm posting this I'm doing a full -both compile with 120 light bounces (instead of default 100).
Didn't know what else to try
 

Collaide

L2: Junior Member
Oct 14, 2015
58
3
So the -fast compile definately did NOT work to properly light thin surfaces.

I don't know what to try now. Fewer bounces??
 

Collaide

L2: Junior Member
Oct 14, 2015
58
3
I'm under the impression these thin surfaces are too tiny to have a proper lightmap applied to them, meaning, if i lower the lightmap scale they won't be black? I'll try doing that and see if it works, in case any future mappers find this thread through google or something,