Hitech: Allow me to ask a dumb question: the only way I see to add trees is when editing a tile in the object editor and there I see only a subset of SpeedTree's library (maybe about two dozen trees). When you say AH has access to SpeedTree's entire library does that mean HTC can add specific trees to the object editor or can terrain designers add the trees they want?
I guess my question is how does the user add the tree he wants.
Easyscor: No, the snow covered trees are not third party, they're included in SpeedTree's set. There are nice colorful Fall trees as well and bare Winter ones too.
There is no way to "Add" tree types. You can only place existing tree types in the set.
So a User can not add a new tree type.
HiTech