Hi guys, I’m trying to create a simple walkthrough application using Unreal engine for one of my 3d scans but when I import my 3d model into Unreal engine I get these black spots you see on the screenshot below. This is only visible when the model is lit. If I choose to view the unlit model as you can see in the second screenshot the black spots disappear. What could cause this issue? Does anyone know how can I fix this?
Hi! Maybe it’s an issue with the normals.
- If it has a normal map try to remove it from the material.
- If it dosn’t have normal map or removing it not help, open the mesh in blender → File → Import → FBX(if it’s an FBX) → open the mesh → Overlay menu(intersecting full and empty circles in the top right side of the 3D viewport) → Face orientation(Bottom of the menu). If you see red spots where there is black in unreal this was the probleme → Select you mesh → hit Tab → Select menu → All → Shift+N(this will recalculate the normals) → hit Tab again → File - Export → FBX.
- If you didn’t saw red spots on your mesh, select your mesh → Object → Shade auto smooth → set the smooting to 180 degres(bottom left side) → Add modifier(center of the righ side) → Weighted normal → File → Export → FBX
I finally found it was a scale issue as I changed the scale of the model when I imported the fbx and for some reason that caused the black spots. I tried to import again the model in the correct scale and there are no black spots anymore.