forum.freeciv.org

Currenlty map generater takes terrain properties (such as property_dry, property_wet, property_tropical etc) as alternatives, if some different properties are defined, terrain would spawn if one of them falls into conditions.
But it is often hard or even impossible to define terrain, which would not spawn in given region.
Thus I propose to allow negative numbers for terrain property_* flags:
negative number will decrease probability of spawning given terrain, if such terrain criterion is meet (-100 exclude such terrain if given property is more than zero).

What problem do you experiense? I haven't seen tundra on equator.

For example savana hills, which should spawn in tropical+dry+mountainous, or snowy mountains only in cold/frozen and mountainous.