RBD Constraint Explained | Houdini 19.5

[@user-sl309jd90]

You can animate constraints in the SOP level outside of the RBD Bullet Solver. In the solver, go to Advanced, then check Overwrite with SOP in Constraints.

[@InsideTheMindSpace]

Thats good to know. Thanks for that. Unfortunately it seems to not always work the way I would expect.

[@smb3d]

You can animate things outside of the solver as well, you just need to add your animated Strength attribute to the "Override Attributes" section under the Constraints tab, then it will update that every frame. Same goes for animating Active or anything else. There are several places you can do this on the Bullet Solver node.

[@mitchelltharp8023]

i needed this so bad thanks!

[@massimobaita7178]

Thank You very much!

[@poornimarao8490]

Thanks for the tut

[@frigbychilwether]

Hi, thanks for this very useful. A question - could you connect the colour nodes in the obj level to a null, then in the geometry wrangle set one of the inputs to that null then just read the colour from that input using something like prim(1,"Cd",@primnum) rather than add the vop ? (don't know if that would work but I think I've seen something similar using vellum constraints)

[@InsideTheMindSpace]

I'm not sure if it is or not. I would have to try it. From what I played around with though it didn't like animation outside of the solver.

[@AW_FXART]

Trying to follow along, but when I'm inside the bullet solver, I can't create a geometry wrangle. Does anyone know why? Thanks!

[@AW_FXART]

Quick update: I made a new project file, did the same things I did before, and it worked!