Vellum Super Rigid Constraints

[ParticleSkull]

Since I couldn't find a way to use RBD and Vellum, does anybody knows if it's possible to make super rigid constraints on a vellum object to make it act like a rock solid object?

[Noobini]

this here has the handkerchief, naturally as vellum cloth, then it also has pearls which are like RBDs....but the pearls are really just vellum cloth objects that are incredibly stiff...so it 'looks' like 2-way interaction between RBD and vellum

 

[ParticleSkull]

Thx Vusta, but it looks like the pearls would bend under pressure

[MENOZ]

http://www.sidefx.com/docs/houdini/dyno/plasticity.html

Note

It is difficult to make very stiff material in Vellum, such as sheet metal. For very hard materials, use Bullet Soft Constraints.

[Atom]

More constraint iterations can help make vellum more solid. Here is Noobini's hanky pearls with 600 iterations on the vellum solver.

[Noobini]

I've gone this route...if someone asks you to bend a 1x1x1 segment box.......well you can't cos there ain't enough segments for it to bend.

So I decide if the pearls are sooooo low res, they would less likely to deform.

So in my new file, if you sim it now (don't go down to peak and subdiv yet) the pearl sphere have Freq at 2, you'll see deformations as they smash into each other. Substep for the sim is at 2 which is a minimal increase.

Now go up to the sphere and change Freq to 1, sim again....to the naked eye...that's good enough for me as a rigid object.

Then now you'll see the cheating purpose of the peak and subdiv, they are simply there to get back the volume of the pearls that were lost due to extreme low res setting. I'd take this approach with the cost as a minimal substep increase.

Of course, I don't know how extreme your situation is....is there a mock up test file ?

vu_hankypearls2.hiplc

Edited December 9, 2018 by Noobini

[LorcanOS]

yea im having some success but not much with super high constraint values, but the flaps move around and deform a lot. 

would love some advice if anyone has some.

Vellum_FlapTest.mp4