You can also do that technique in Blender. If you make these as objects (obj), you would make a large tree from object then resize a duplicate or duplicates. Create a vertex group of outer branch vertices from first tree and apply duplicates as a particle system using the smaller tree or smaller group with rotation enabled. This works good for being able to rotate the branches to connect to the tree. When you have your tree fixed, apply the particle system, then group branches to tree. Export away....
