holes in geo unreal, but not in substance painter or maya

cturbo

I am new to unreal and games and I have imported my low poly mesh into unreal, and its been unwrapped and checked face normals and made sure all vertex are merged and it baked fine, and i couldnt see these holes in maya or substance painter, but i can see these holes in unreal. Does anyone know what is causing this? I would appreciate anyones help.

poopipe

there is limited precision on the vertex positions but I don't think it's that. 

are you using displacement or anything weird in the material? 

cturbo

no, its just the usual maps

cturbo

i cant see it on substance painter

ZacD

Is the mesh triangluated before import? 

Uekicks

Does it contain more than 4-sided faces?

Or the mesh orientation may be inverted, etc.

I don't know what tool you are using, but if it is Maya, running a cleanup may reveal errors in the model.