Constraint packed RBD to the deforrming or animating static RBD

[tamagochy]

Hi all,

Is it possible to constrain packed RBD objects to the static deforming or animated obj? In TP its work by default without any problems, but in houdini I cant find solution.

Thanks!

[fencer]

Use TP

[benne5]

You can create a glue constraint system on a single  packed object( So make the static object and your packed object just one packed object).  It can be animated by creating an active attribute in SOPs and toggling on overwrite attribute on the rbd packed object in DOPs.  Then ensure that the constraint strength is strong enough so that it will not break apart.

[tamagochy]

Can you make simple example? I have animated mesh and I need to constrain to it another fragmented obj and it should follow animation but when collide with another object  it should brake.

[vicvvsh]

Hi Andrii,

I did tests with constraints some time ago and it is what I come to. This is example with glue constraint but with hard and twist it will work too I guess with Sop Solver DOP.

constraints_test.hipnc

[tamagochy]

Thanks Victor, now I understand why my setup not work, this king of setup working only with animated geo, but if switch to deforming one it doesn't work. And problem with packedfulltransform I think, because for deforming obj its doesn't change. So I need find the way to update it. I found how to do it with hard constraint, using primuv for update constraint point position, but its not working for glue.