Visual artifacts on the road

[stonier]

Due probably to objects being co-planar - not as dire as that discussed in maliput/delphyne#150, but still some artifacts around unless you zoom in close to the road.

[basicNew]

I think that is a bug on the road generation side, as I recall seeing the same thing on a mesh visualizer when loading the road network. @agalbachicar can you confirm that?

[agalbachicar]

I noticed the same thing when I restored the application some days ago. I also noticed that when changing the zoom the artifacs changed size / position. I will take a look ant try to identify the source of the problem.

[stonier]

@agalbachicar did you discover anything here? I suspect the light and dark violet manifolds of the road are what they refer to as z-fighting. I've had this before, and usually took the stupidly simple shortcut of making sure the two surfaces are offset by a sufficient epsilon (but I suspect that just pushes the z-fighting problem out).

Note: googling z-fighting and opengl turns up alot of information about this problem.

[agalbachicar]

I did a quick FU, and the only thing I could discover that even with a z-difference when you zoom out enough the artifacts are visible again and appear erratically.

Do you think this became important enough to allocate some time to remove it?