The Altitude rollout provides a layer of control over distribution based on the elevation information.
Minimum - Specifies the lower bound of the altitude range. Maximum - Specifies the upper bound of the altitude range.
The Minimum and Maximum parameters serve as the beginning and end of the falloff interval. It is worth mentioning that both are used by the falloff regardless of the on-ness state of this constraint.
The Density & Scale Falloff enables the reduction and scaling of elements based on the provided Limit parameters. Those may come especially useful when reproducing lower oxygen levels effect in high mountains, where due to its sparse condensation foliage tends to be less prominent. Please refer to the Falloff Graph section for a detailed explanation of theirs parameters.