Degenerate Tangent Bases / Lighting Bug

Development Rendering
1

Hi!

I’m using Unreal Engine since the day it was launched for free and this bug never occurred to me.
Basically when I import this mesh I get an error that something along the lines that the mesh has degenerate tangent bases which will result in incorrect shading and that I should disable MikkTSpace.
I do that and then rebuild the lighting and I get this weird effect

![alt text][1]

basically it’s all weird and stuff

This is how it looks in Maya

![alt text][2]

And this is how it looks before rebuilding

![alt text][3]

UVs look like this:

![alt text][4]

I did not unwrap the UVs in Maya with this mesh but I did it on another one and it doesn’t fix anything.

I’m “raging” at this point since I’ve been stuck with this thing and trying to solve it for the past 6 hours, any help will be really appreciated!

2

degenerate tangent basis warning is most commonly caused by missing UVs. Double check that you are exporting UV0 channel correctly.But in your case, your mesh looks strange. It should not be modeled that way. I bet it gets triangulated in strange way. Your UV layout screenshot sort of supports this theory.Try remodeling the mesh, terminating all edge loops properly.