Justin,

You'll find a tree-generation macro included with:
http://www.tomandlu.co.uk/webres/raytracing/gallery/tmwinter.zip

This was used to create the tree in:
http://www.tomandlu.co.uk/webres/raytracing/gallery/pics/tmwinter.jpg

No leaves, I'm afraid, but it wouldn't be too hard to add them.

The approach I used was basically:

Generate a single branch by joining together blob components.

Whenever you generate a component, generate a random number and use to decide
whether to fork or not

If fork, then place the current vector in an array, and increase a pointer to
keep track of how many branch vectors there are.

If unprocessed branches exist, create a new branch starting from the stored
vector.

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