[Sidefx-houdini-list] force rotation of a particle?

François Duchesneau sidefx at trinix.ca
Thu Jul 29 20:42:24 EDT 2010

The following is from my Wiki. It should help. In your case, if you 
don't want rotation, make sure you don't have "up" nor "orient" nor "rot"

Orienting a particle is useful when copying or instancing an object to 
it. To align an object properly, at least two vectors are needed or an 
attribute of type vector4. Houdini recognizes different attributes to 
align with the *Copy Sop* and instancing. Both *N* and *v* works in pair 
with *up*. *rot* and *orient* are vector4 quaternion attributes. Each 
one supersede others in the following order (The ones below override the 
ones above).

   1. v and up
   2. N and up
         1. rot is added to ones above
   3. orient


jacob fisher wrote:
> Hey there,
> I'm running a simple sim bouncing particles on a surface.
> However, when I copy geometry there are odd rotations in the
> particle/geo and when they come to the final resting spot, they
> usually land at various angles.
> This is just a simple POPnet (location, force, collision, split,
> interact, force, collision) set up that goes out to a copy.
> Is there any particle tool I'm not familiar with to kill rotation? or
> to cause the particles to Y up at the end or something?
> Thanks for any help you guys can give.
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