[Sidefx-houdini-list] particle trail

Rangi Sutton rangi.sutton at optusnet.com.au
Tue Sep 6 18:04:01 EDT 2005

Ben Schrijvers wrote:

> Hi there,
> Does someone know how the Birth Probability works?
> What I'm trying to do is have particles birth from other particles in 
> a way that the new particles form a evenly spaced trail.
> So a fast particle would birth more particles then a slow one in a way 
> that both would leave the same amount along the same distance.
> The amount of particles to birth per point/sec would be the length(v) 
> divided by distance between each step.
> But I can't seem to get the probability to take these values.
> Anyone any idea.. or a better method?

Hey Schrijvers,

Trail the things.. connect them into curves, resample at even lengths. 
Use that as your particle source. Still gotta be a bit tricky with the 
birthing but you get pretty good control of the spacing that way. Just a 


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