Comment 2 for bug 1348800

Hi,

I believe you wanted to change these lines in logic/terrain_affinity.cc :

const double sigma_fertility = (1. - affinity.pickiness()) * 0.25 + 1e-2;
const double sigma_humidity = (1. - affinity.pickiness()) * 0.25 + 1e-2;
const double sigma_temperature = (1. - affinity.pickiness()) * 12.5 + 1e-1;

I did not do thorough tests, mainly I run atoll map, but I settled on values: 0.8, 0.3,15.0. I think that only slight modification are needed. But more tests on desert maps would be usefull to get better picture.

Personally, I think that blackland simply does not fit well into normal earth-like biomes (desert, greenland, cold lands and mountains).