[Sidefx-houdini-list] Building a particle collision system

François Duchesneau sidefx at trinix.ca
Sun Aug 15 20:03:42 EDT 2010

I forgot to mention that I want to avoid SDF because even if I agree 
that in many situations it's a great tool, in others it's just too heavy 
to calculate to have a good resolution.

I started my collision system with this and then I had a shot where I've 
got lots of rocks in a river separated by a great distance. The sdf had 
to be huge. Thus I used many smaller SDF for each rock independently 
merged but the Volume Sample Vop needs to know which primitive.

That's where I started to think about how fast and reliable Maya can do 
collision on the fly without pre-baking. It should be like that in 
Houdini too.


Rangi Sutton wrote:
> 2010/8/16 François Duchesneau <sidefx at trinix.ca>
>> Hi list,
>> I'm not satisfied with the particle collision in Houdini and I'd like to
>> create my own. I started to do something in Vop Pop using ray tracing
>> and I think it would work for static objects but it has its weakness. I
>> think I will need different algorithms.
> Hi Francois,
> I'd suggest looking at colliding against SDF primitives as an option... very
> easy to roll you're own collsion pops.. very fast.. very stable results.
> You've just got the overhead of converting to SDFs (or work your pipeline so
> you have SDF representations of everything...)
> Cheers,
> r.
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