FOSS gamedev and creative worlds

This is probably an issue with my C++ code, rather than the game, but can anyone speculate on why I'm getting these lighting problems in rough terrain? I'm not sure where to begin on this.



The screenshot is from a new world, without any mods, using my mapgen.

If anyone wants to look at the code, it's here. Most of the form was taken from the version 7 mapgen (which doesn't have this problem).

Maybe you should copy this code ?

Gael de Sailly wrote:Maybe you should copy this code ?

No, that actually makes it worse. I wonder why v6 passes so much larger a vector.



It might be a border issue. All the dark spots I've checked are at altitude 62.5.

Yes we have a shadow problem at y = 63 in all mapgens other than mgv6, details here https://github.com/minetest/minetest/issues/2759 it's still a mystery.
All mapgens other than mgv6 have 1 up 1 down overgeneration, which is why the lighting calls have different volumes (and why using the mgv6 lighting volumes in mgv7etc causes a black world). Also, mgv6 overgenerates sideways due to mudflow which is why the lighting volume is wider.