I have this issue when I import a house in Unreal 4 created with Reality Creation:
In Meshlab the same mesh looks fine:
This house is as big as a chair. My suspicion is that the very small scale causes these artifacts in Unreal 4. It looks like some precision loss.
I tried to scale the house in Blender but it did not solved the artifacts visible in Unreal 4. I also tried to scale it when exporting from Reality Capture. Still not solved.
Strange is that in Meshlab the same models looks just fine.
Could it be an import setting of Unreal ?
Any tip is appreciated.
Thank you !