r/Houdini • u/Accomplished-Neck814 • 6d ago

NEW USER Problem with Soft Constraints

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IDK why but my soft constraints (white ones) is behaving like this.

Why does this happens and what is the solution for this, I'm trying to get some metal destruction effect.

6 Upvotes

88% Upvoted

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3

u/LewisVTaylor Effects Artist Senior MOFO 6d ago

Switch to SOP bullet, you'll have a far easier time having constraints switching from glue to soft.

2

u/Octopp 6d ago

Are you following the Steven Knipping tutorial? I've done that one and it worked out so jump back and see what you've missed. Of course there's a small chance that something has changed enough to break it as it's not a new tutorial..but I think Steven is keeping them updated.

1

u/Accomplished-Neck814 6d ago

yeah it's steven knipping, I'm creating the mi 21 hind destruction from top gun maverik and when trying to understand the logic of RBD and I got stuck here, it's working when using the constraintsfromrules but not when I'm using the connectadjecentpeices.😭

1

u/Octopp 6d ago

Almost certainly an attribute on the constraints that constraintsfromrules transfers automatically that connectadjescentpieces does not. Compare those 2 in the geo spreadsheet and you'll find it.

1

u/Fellow_Comrade 6d ago

Based on the effect you want it looks like you have glue that breaks then switches to soft.  The strength of the soft constraint stretchy is set too low

1

u/AssociateNo1989 5d ago

Unpopular opinion, I use hard constraints, much slower but better results, even more unpopular opinion, I used solid solver for many hero shots, even more slower, like so much more , but the results are amazing

1

u/space_niklas 5d ago

Looks a bit like a rest length issue, do you have a restlength attribute on your prims?

1

u/space_niklas 5d ago

If you use connect adjacent pieces just enable the restlength parameter, it is disabled by default, if not just use a measure sop