Texturing Wont Work

[castanedakevin1424]

I was working on a model in MAYA(2024) and for the record I am still kinda new to the 3D modelling scene. I was trying to Texture in Substance Painter when I got an error message that read,"[Scene 3D] [FBX] : Mesh normals are invalid (some values are null) and will be recomputed". I realized that there was an issue with the mesh or the UV. I went back and redid the UV twice. The model itself have many components as it wasn't made from a single mesh rather from multiple objects. I first "combined" all the objects and then began UV mapping the model>auto seams> unstack shells> Normalize. Applied a material to the model and textures looked very weird. Then went back into Maya, seperated the model back into its original objects and then decided to UV map every individual part of the Model, apply a new material and UV mapped, imported into Substance Painter, and still didn't work. FYI this model is ultimately intended to be imported into UE5. I wish to know where exactly the problem lies as I already know its an issue with the mesh/UV but I wanted to know where exactly is the problem as I've been doing my best for the 3 days now to figure out the root of the problem. Please let me know if you need more info about the model, thank you!

[Christoph_Schaedl]

I cant see the uv grid. I dont know if everything is in 0-1 space.

And for a gameready mesh your geometry is really dens. 

Have you done a mesh cleanup? Maybe there is some bad geo?

[castanedakevin1424]

I have tried mesh cleanup and before cleaning it up I had also gotten issue with non-manifold geometry, I checked the box to detected the non-manifold geometry and strangely. enough, nothing was detected so this is when I just began UV mapping again. Also the UV islands are all within the 0-1 space I made sure it was before taking the UV snapshot.