Lines showing through solid objects in rendered + shaded view

I have an issue that I can’t seem to resolve, I keep getting these lines showing through my objects whenever I view them even slightly off angle beyond a certain distance - the lines are projecting through from the edges of the objects behind.

I’ve tried a few things already but to no avail - updated Rhino and graphics drivers, turned off anti-aliasing, the TestZBiasFactor command (more makes it worse but less doesn’t make it better).

If anyone knows how I can resolve it it would be much appreciated!

My graphics setup:

NVIDIA Corporation
GeForce GTX 970/PCIe/SSE2
OpenGL version: 4.6.0 NVIDIA 397.93
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 5-22-2018
Driver Version:

Maximum Texture size: 16384 x 16384
Z-Buffer depth: 24bits
Stencil depth: 8bits
Maximum Viewport size: 16384 x 16384
Total Video Memory: 4 GB

Hello - try running testZBiasFactor (test command, does not autocomplete) and lowering that number - does that make any difference?


Howdy - didn’t do much unfortunately, a small difference in a few areas but the problem persists