Tree bugs:
	I used end instead of prev_pos
		That was pretty wrong
	Then I replaced it one extra place
		That was less wrong
	Did a little adjustment of weighting in averages

Third:  Texture coordinates
	I think we'll actually skip this fix
		It looks less bad than I imagined
		But if you want to fix it, add texture bounds to draw_branch_section

Recursion on the curves:
	I added it offline so we'd start leaves in good order

Little branches off to the sides:
	It's an algorithm adjustment
	Let's add a "verticality" measure
		Remember dot product?
	Then we can scale radius based on that
	Can also modify branch division thing to keep a main branch going

The main missing item:  Leaves!

We need a make_leaf function
	Simple leaf or compound leaf?
	Can it be a polygon with a lot of vertices?
		I think Blender supports that
	Should they have stems?
	What angle are they at?
	We can trace some kind of leafish shape
		Oval?
		They can have a green texture

But where should the leaves be?
	Ends of branches?  Not really how trees are
	Attached to sufficiently-thin branches?
		Might look ok
		Smaller radius = higher chance of a leaf at each segment

Before we start the leaf function:
	What's still wrong with this tree?
	Branches don't avoid other branches
		A fix:  store end points of all branches, avoid placing branches near them
			Kind of a data structures challenge for good performance
			Hash table representing locations?
			Bitmap with 3D coordinates and limited precision?

Leaf function time:
	It'll probably end up broken as usual

The final project:
	Create a scene that includes at least 3 of the 5:
		Fractals
		A landscape
		Buildings
		A maze or mazes
		Trees or other plants
	The scene must include at least two things that are animated
	Lighting must be arranged
	Create a movie showing this scene, which can be added to a gallery
		I'll put the gallery on isoptera, but feel free to use the movie anywhere else