Solid Object dynamic map attribute

[merlino]

Hello,

 

I have a FEM sim with a Solid Object with a map for the shapestiffness but I'd like to animate it. Obviously I can do that at sop level but how can I bring that info at DOP level?

 

Thanks in advance!

Marco

[MrScienceOfficer]

You need to use a SOP Solver and a multi solver set up  This should do it.

FEMSopSolver.hipnc

[merlino]

Hi Tom! I tried that solution, but I can't make it works with the shapestiffness (or other) attribute.

The point is that every frame it's like is multiplying the old value by the new one so I can't set the values I really want.

 

I modified your hip to use the shapestiffness attribute and I want to feed the object with the attr values I paint in SOP. But it doesn't works as I need.

 

Thanks for your help!

FEMSopSolver_shapestiffness.hipnc

[MrScienceOfficer]

Yea, that makes sense.  I don't have Houdini at the moment but that sounds right.  

 

The issue is unlike in a SOP where you start from the top of the node chain with say a simple sphere and cook down the chain applying the effects of each node once, when you use a DOP net with a SOP solver the SOP chain is running in a cycle, being passed back and forth between the DOP Solvers and the SOP Solver.

 

So every time you apply the Paint SOP your actually adding a new layer of paint on top the previous one, hence the effect of accumulating values.  

 

The solution should be as simple as deleting the shapestiffness attribute above the node where you apply your attributes map.

Edited September 16, 2015 by MrScienceOfficer

[merlino]

It sounds great and logic!

 

I'll try right now!

 

Thanks!

 

YEP! it works! Many thanks Tom!

 

Here's the file:

FEMSopSolver_shapestiffness_animOK.hipnc

Edited September 17, 2015 by merlino