Is there a flag to remove lines in shaded viewport?

please see screen capture, is it possible to NOT show lines behind geometry, not so easy to explain…

i have circled the lines in question, they appear all over the model…

i guess it might be a video card issue as i dont get same results in Rhino 6

i belive that issue pops ups from time to time since i have seen it reported, the solution is indeed to update the driver. if you are up do date and you still see this happening, it would help to post your geometry. i have also seen that happening when the geometry is far away from the center of origin, it at least looks similar.

This looks like a model specific issue and not a graphics driver issue. You might want to experiment with TestZBiasFactor to see if that improves the situation. Here is a discussion of the command