Lightmaps artifacts with objects behind a surface
I'm experiencing strange artifacts trying to build the lightmaps.
The scene is part of an archviz project, walls and ceilings are built with 2d poligons with a 2 sided diffuse material. The interior is lit by indirect lighting only. In this scenario lights are mapped more ore less correctly:
In the exactly same context, introducing objects behind these meshes (e.g. another 2d exterior shell behind the wall with the same 2 sided material) changes completely the luminosity inside the environment (even if it does not occlude it in any way) and causes strange artifacts as in the picture below:
The artifacts are completely independent from the lighmap size of the visible objects (I don't think they are bleedings from other objects), and seem due to some interaction with the objects behind the wall.
What may these artifacts be due to? any suggestion?
Hi devel.bmad -
The Lightmap density for your ceiling piece is extremely high which leads me to believe that you may have some compressed UVs for that piece which can cause the sort of distortion you are seeing. Look closely at that unwrapped pieces 2nd UV channel.
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