Model Import Issue - Mesh suddenly has dark spots

[Lord_Zombs (Snow)]

I have this weird issue when importing my mesh from Blender to Roblox, tried both .glb and .fbx but the issue persists.

Basically i wanted a model without any material so I can easily use roblox studio materials on it instead, so I didnt assign it any material since that’s what people online said to do and sorta makes sense. I did however UV unwrap it.

My uv map seems fine and the normals as well but still it looks like this, all weird with darker spots. I must be missing something obvious but I have no idea. It almost looks like weird ao but roblox doesnt do ao and I havent attached any textures/materials or even exported with any.

I attached the .fbx below in case anyone needs it.

Maybe this is just an issue on my end or something is wrong with my model, no idea. Thanks for any help in advance!

Sewer Large Opening.fbx (21.4 KB)

[nana2050]

did you shade the flat part? sometimes if you shade it flat it gets worse somehow, and when that happens i usually just reconstruct the face manually

[chkfla2 (chkfla)]

try clearing any vertex colors

[Lord_Zombs (Snow)]

Yea thanks it was that, I have not vertex painted at all on this blender file but still removing the color attribute fixed it weirdly enough.