[Sidefx-houdini-list] wires dynamic problem

guillaume at alamaison.fr guillaume at alamaison.fr
Thu Jan 15 16:18:32 EST 2009

Yes, I just found the solution :).

Only the first point of my wire was animated by hand in SOP. I added this
animation to all the points instead
of just the first one and now it works perfectly !

I found the problem because I didn't understand why the wire dynamics
worked well on previous work with some fur animations. 
I realized that each fur guides sent to the DOP was moving from root to tip
points (as animation came from the copy sop
template input). 

In my current work, I was copying the animation of a character hand on the
first point of a curve/wire, thinking that all the
other points will be animated by the wire solver. Good to know (for me at
least :) ) !



On Thu, 15 Jan 2009 11:09:32 -0800, Mark Story <mstory at xion.org> wrote:
> Hmmm ... that's odd.  I don't know if it would be a reasonable work 
> around, but you can assign those attributes as a point attr and dial in 
> the exact mount of stretching/bending you need along the length of the
> wire.
> The particular behavior you describe I've never encountered before, 
> (I've done a lot of work with Wire DOPs) but am interested in what might 
> be happening ... if you can't solve the problem, please post a hip file 
> on one of the forums so we can take a look.
> Good luck!
> Mark
>> I'm working on a simple DOP wire simulation. The setup is just one curve

>> (rather long).
>> At SOP level, the root of the curve is constrained on a keyframe
>> animation.
>> In my DOP network, I'm using "Use Deforming Geometry" in the Wire
>> I use a SBD Pin Constraint on the root points ( 0-3 ) and then check 
>> "Constrain To Animation" to keep
>> the SOP animation on the 0-3 points.
>> My problem is that I can't find a way to avoid some stretching between 
>> the pin points and the first point moved by the wire solver.
>> To limit the stretching, I set a high value on the Linear Spring 
>> Constant. It works fine for all the points, except
>> between the "pin points" and the "solved points".
>> Any tips to stop this stretching is welcome.
>> Cheers
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