[Sidefx-houdini-list] Grabbing velocity from dops

Ben Schrijvers ben.schrijvers at guerrilla-games.com
Fri Jun 29 05:10:40 EDT 2007

But that vel attribute is only translation. I geuss when the objects 
rotate you'll also have to use rotation velocity (rotvel?).
That would then only work when you use the channels in object space. So 
a geo node per object.. or some sort of instancing trickyness.


Rangi Sutton wrote:
> Louis Dunlevy wrote:
>> the dopfield expressions should do it for you although obviously 
>> you're only going to get the velocity of each individual piece rather 
>> than a varying attribute over the surface. I've been lazily putting a 
>> trail SOP down..
>> dopfield("../dopnet1", "myRbdObj_$CUSTOMID", "Position", "Options", 
>> 0, "vx")
>> or maybe
>> dopfield("../dopnet1", "myRbdObj_$CUSTOMID", "Position", "Options", 
>> 0, "velx")
>> or if you want to reference some custom data..
>> dopfield("../dopnet1", "myRbdObj_$FUNNYID", "BirthData", "Options", 
>> 0, "BirthFrame")
>> I have noticed that DOPs transforms vector3 attributes so you could 
>> try to pass v in and then suck it out and see what it looks like
>> something along the lines of (although this is definitely wrong)
>> dopfield("../dopnet1", "myRbdObj_$FUNNYID", "Geometry", "Options", 0, 
>> "vx") +
> All good to know!
>> Can you use the Dop Transform SOP in you're setup? That gives you 
>> velocity.
> That's the head slap I was looking for!
>> beeeeeeeeer, or mybe milk.. hmm I'm not too gone on milk
> Bailies? Nah. Beers.
> r.
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