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Strange artifacts in translucent Tulle curtains

Hi to all…

I am finishing an arhviz project, but I see strange artifacts in the curtains. They have a Translucent material with 2-sided foliage and 1.0 refraction. It seems that Unreal does not correctly calculate

the overlapping faces with that translucent material, the back faces appear occluded or something. I think it is not a lightmaps or lightmass setting problem. I don’t know what parameter to touch

anymore … I don’t think Unreal has such a basic limitation, it’s certainly something that escapes me …

Thanks in advance

Of course…

Look at the artifacts in the curtain.