In article <395a81de@news.povray.org>, "Rune" <run### [at] inamecom> 
wrote:

> Is the particle_system frame independent? That is, when animated, is 
> it relying completely on the clock, and not on saving data between 
> the frames? Or is it frame dependent, that is, you may not get the 
> same result when you render an animation with 20 frames and another 
> with 100 frames. I hope it is frame independent.

It does not save data between frames, it recalculates it every time. It 
might have a problem with different frames producing different jitter 
values in the simulation, I am going to try to fix this(if it turns out 
to be a real problem).


> How does the collision detection work? Do you have to specify all 
> objects the particles should detects, or does it automatically detect 
> all objects in the scene? I hope it detects all objects 
> automatically, maybe with an option to turn detection *off* for 
> specified objects, rather than having an option turning detection 
> *on* for specified objects. But I may not have thought this through 
> well enough...

Objects the particle_system interacts with are specified by an 
"environment" keyword in the particle_system statement. This is more 
flexible than having a per-object keyword, since you can have one 
particle_system interact with an object but others ignore it, and also 
avoids problems with particle systems interacting with other particle 
systems that aren't created yet.

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/

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