Mirrored Geometry Flips Normals Y-Axis
I apologize if this problem is documented somewhere, I have honestly spent the last two days looking for a solution and found none.
I have a model with an alpha plane that I've mirrored along the Y-axis -- this of course causes the UVs to be flipped, which is normal. In Maya it displays fine in the viewport, but in Marmoset or UDK the Green channel of the normal map gets flipped. I have done every trick I can think of to manipulate the normals to behave properly but nothing worked.
The thing is, yesterday I stumbled upon an apparent fix: instead of just using the mirror geometry tool I used the mirror CUT tool instead, and made sure both sides were still one connected geometry. It somehow worked and fixed even the parts of the model that I hadn't touched.
Except the problem seems to have reverted itself today after I went back to create lightmap UVs, and my previous fix has absolutely no effect. On top of that the geometry in my most recent Maya save files has corrupted and no longer loads, so I can't even fall back on that. This seems like it should be an easy fix and I just can't find it, so any help would be incredibly helpful.
I have a model with an alpha plane that I've mirrored along the Y-axis -- this of course causes the UVs to be flipped, which is normal. In Maya it displays fine in the viewport, but in Marmoset or UDK the Green channel of the normal map gets flipped. I have done every trick I can think of to manipulate the normals to behave properly but nothing worked.
The thing is, yesterday I stumbled upon an apparent fix: instead of just using the mirror geometry tool I used the mirror CUT tool instead, and made sure both sides were still one connected geometry. It somehow worked and fixed even the parts of the model that I hadn't touched.
Except the problem seems to have reverted itself today after I went back to create lightmap UVs, and my previous fix has absolutely no effect. On top of that the geometry in my most recent Maya save files has corrupted and no longer loads, so I can't even fall back on that. This seems like it should be an easy fix and I just can't find it, so any help would be incredibly helpful.