[Sidefx-houdini-list] Emitter velocity

Andy Nicholas andy at andynicholas.com
Tue Oct 23 12:58:53 EDT 2007

Thanks for that Andras, I took your advice about using CHOPs and ended up
using "Slope" to get what I needed.

I'll pass on your greetings to the guys here, although you slightly
freaked me out by knowing that I'm here! Heh! :-D



> Hi Andy,
> The simplest I can think of is a trailSOP then using point() sample a
> given
> point's velocity attribute.
> Alternatively feed the transform to CHOPs and derive the speed there..
> but then you need to take both rotation and translation into account.
> cheers,
> Andras
> ps: say hi to the guys at Axis, if you happen to head that way :)
> On 10/23/07, Andy Nicholas <andy at andynicholas.com> wrote:
>> Hi,
>> Can anyone tell me how I can get the velocity of an object into an
>> expression? I need to vary the direction of emission of some particles
>> based on their emitter's velocity.
>> I'm sure there's a simple answer, but I haven't found it yet!
>> Thanks
>> Andy
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