SpeedTrees are implemented as members of a single SpeedTree forest on each display engine.

The DtForest is a facade around the distributed DtForestObject. The DtForestObject, like the DtTerrainPatchObject, combines some of the functionality of a scene object and a model into a single object.

The forest is located in the scene graph under the object root node, but since SpeedTrees are drawn outside of OSG, they are not included in any intersection tests.

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