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I have a project in witch we generate a lot of random trees on the places point helpers are created. The point helpers are in different groups like: BIG_TREES and SMALL_TREES. Then for big trees are defined with height 15 +/- 5 meters, and a collection of possible trees images. Then you can use a script to really create those images. I used it to create billboard trees. In my project I also created a view for the trees seen from above.
But I am sure there are a lot of other uses, like marking waypoints for avatars. Or marking chimneys where at certain moments a smoke particle system should be created.
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