[Sidefx-houdini-list] H9 : wire glue constraint pb

Derrick Moser derrick at sidefx.com
Wed Oct 3 12:32:59 EDT 2007


The parameters in the wireglueconstraint1 node just need some modifications.
1) correct the constrained object's name by choosing "wire_hair" from 
the Constrained Object's menu
2) turn off "Constrain To Animation"
3) choose the "rbd_skin" in the Goal Object's menu
4) update "Goal Point" to the point you wish to constrain to ("15" for 
the attached example)

Some other things you may wish to consider:

The "Goal Point" does not need to be specified (use -1) if the RBD 
object's animation is at the object level (instead of animating in SOPs) 
because DOPs will consider the object moving as a whole instead of 
deforming.  This also means wires can be constrained to arbitrary 
locations on the RBD object instead of being limited to the points of 
the RBD object.

If you want to use deforming geometry for the RBD object, consider 
transferring the motion to sop_hair (maybe through a Copy SOP) and 
turning on "Use Deforming Geometry" in the wire object and "Constrain To 
Animation" in the wire glue constraint.  In this case, the RBD object is 
no longer required in the DOP network but you may wish to keep it around 
for a collision object.


guillaume laforge wrote:
> Hi,
> It is my first try with Houdini 9 wires and I can't figure how to constrain
> some curves roots to a geometry.
> In H8 I used the goalpoint attribute to identify the points to constrain but
> in H9 it doesn't work. The help sample files show the use of a "roots" group
> to
> identify those points but I can't make it works in this simple setup :
> http://www.vol2nuit.fr/wire_glue_constraint.hip
> Thanks for any help !
> Cheers

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