> The location of all objects is <0,0,0> until acted on by translations /
> rotations.  The final location is the sum of these transformations.

sphere { y*10,1 } is located at the origin? Well Real Life (tm) is not 
logical, either, so why not :)

About your particle system: You have to keep in mind that there may be 
objects in the scene which have nothing to do with your system. To 
seperate them from the ones your system interacts with you need a flag 
for each object... Not really a nice and clean solution.

Normally I use something like this in such cases:

#declare System_Environment = object { SomeObject }

Or use an array of such environments if you want to give each 
environment specific properties (in a particle system, that might be 
things like friction, damping, etc.).

This method has another advantage: The objects your system works with 
don't have to be part of the scene. That might sound strange, but 
sometimes it's a handy thing to have.

Don't get me wrong, I'd love to see a syntax like the one you described 
(and I'd like write-access, too *g*). But in most cases you can use a 
pretty clean workaround.


HTH,
Florian

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