FOSS gamedev and creative worlds

At which height (Y) does lava start to appear in Minetest Game in each of the core map generators?

Mgv6 -32 all others -273.

Thanks. How do I change the height?
Is the height related to water_level or is it independent from it?

And why -273? This number seems odd. ;-)

Wuzzy wrote:And why -273? This number seems odd. ;-)

Sounds like absolute zero in celcius degrees :)

Well -273 is the highest maxp below -256 which is the coded limit.
These depths are hardcoded.
In mgv6 the lava depth is related to water level, it will always be a mapchunk lower.
All other mapgens it's a constant -256.