> Well, I know this is supposedly how CAD works, but I have yet to see any 
> readily available software that offers such power. (I did have a go at 
> writing such a thing myself once though...)

As Michael mentioned, look at Blender, it is biased more towards animation 
that actual design work, but still allows all the things I mentioned + lots 
of animation features.  Another example is modelling the suspension of a 
car.  For simplicity let's say the only input is the relative height of the 
wheel compared to the body.  In POV you would need to do the math to align 
and rotate every component to fit together.  In Blender (or another 
CAD/modelling package) you can tell it which bits are "fixed" (using the 
mouse) and then it automatically does all the transforms for you.

> I was thinking more that once you write a script to take a sequence at 250 
> frames per second, add motion blur, and convert down to 25 frames per 
> second, you can then process lots of videos quickly. With VirtualDub, I 
> keep having to re-enter those settings. (And not miss any out...)

Yeh, AVIsynth would be perfect for that, actually it's what I mostly use it 
for (converting POV output to video, and sometimes overlaying it on top of 
real video).

The way I found AVIsynth is through the h264 codec, x264.  It takes AVIsynth 
files as an input, which is perfect to convert from POV output to .mp4 files 
in one step, even including motion blur if you like.

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