Torus seam visible in background

[SimonN]

The level background (not the terrain) should indicate where a torus seam is. E.g., by colored bars.

This has not been in C++ Lix, but was an immediate reaction by IchoTolot. People should not be confused when the same portion of the level is drawn more than once.

[SimonN]

Shown to Icho.

The torus seam should be glaringly visible even on terrain! The impl is OK when there is mostly air around the seam. That's not enough.

[SimonN]

Nobody else wanted a more visible seam. Closing until I get further inputi.