Rather than perpetually bemoan the dearth of a simple yet flexible tree macro,
I'm having a bash at writing one myself. The results are starting to actually
look like trees now rather than bad lumberjacking accidents, so I thought I'd
post something.

Parsed in 15 seconds, rendered in 10 minutes but that's mostly the radiosity and
area light - it renders in under a minute if I use basic lighting.

Next, I need to build the branches from continuous sweeps (currently strings of
mesh cones) to improve realism and reduce the triangle count. Then I'll have a
good play with the parameters to see what variety of forms can be generated
without excessive tinkering ;)

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