Hi! This is my first post over here, hope this is the right place.
I’m having this problem with straigth lines, both in the viewport and rendering throung Unreal Reader in NukeX.
Anyone knows why this happens? It get worst when the camera is far from the mesh, but the mesh has nanite turned on, and also force the LODs to 0 with the variable inside Unreal Reader just in case, but doesn’t seem to solve the problem.
Any help will be great! Thanks so much!
That looks like texture MIP mapping smear to me.
You might want to try increase anti-aliasing, add some MIP map bias for “sharpening,” limit the minimum MIP map size (e g, limit it to 8x8 or so) and turn up the anisotropic filtering to at least 8x, to see if it gets better.
That totally solved my problem!
I ended up changing the texture MipValueMode to MipBias in the master material and adding a scalar parameter to the Bias, so I can control the level within the material instance.
Thanks so much, that was fast Jwatte! 
