Create multiple FEM over time?

[KarlRichter 69]

Interesting problem. You can use a SOP solver with a multisolver node to process the mesh point attributes, you just don't want to affect the P attribute directly. Attached is a solution to your intersect problem using a VDB in a sop solver to dynamically set the targetP attribute. It changes the look of your sim a little, so it still needs tweaking.

For more info on "solid object" point attributes, see here: http://www.sidefx.com/docs/houdini/nodes/dop/solidconfigureobject

Note that this works well enough that you can almost get by with a single substep. Also it almost completely takes place of the internal collision calculated by the finite element solver, try turning off self collision in the attached example to see what I mean.

flask.v1.Odforce.FF.VDB.hiplc

[Guest tar]

@KarlRichter whoa! super nice and looks well threaded too   thanks for posting.

[lamer3d 3]

On 6/9/2017 at 1:54 AM, ParticleSkull said:

Guys, is there a way to get the older spheres out of the simulation, make it rigid?
Let's say, by age. If the sphere is 24 frames old it becames a static/rigid object?

So, whatever happened to this idea? I'm also curious if it would help to stabilize / speed up simulation.

[anthonymcgrath 71]

this is a cool effect - i was trying to get the copy sop to create random rotation on each spawned object but had no luck.  I was using copy stamp but couldn't suss it out - each spawned character just appears in the same rotation sadly :/

[Farmfield 325]

With a copy stamp, random vector per point (per frame) would solve it.

[anthonymcgrath 71]

27 minutes ago, Farmfield said:

With a copy stamp, random vector per point (per frame) would solve it.

all i really know is something like rand($PT)*360 or something noob and incorrect like that - no idea how to set it up for a vector :/

[Farmfield 325]

I was so close doing a wrangle when I remembered - there's wheels already, no need to reinvent one.

[anthonymcgrath 71]

see now my first thought went to attribute randomise but all i ever hear is ppl twiddling wrangles and writing code now so my mindset seemed to gravitate that way and i was trying to do that ffs!  So where would i plug this in on the copy sop?  I'm guessing its before the copy sop on the input template points i reckon..

[Sepu 210]

All the attrb that you want the copy to take into account for your points need to put it before the Copy. rand color, size, orient, etc.

[ParticleSkull 83]

hey @lamer3d , I think it wasn't a good idea. @KarlRichter's setup (thx for that, Karl!!) is pretty solid btw, a bit complex but work perfectly

Edited June 27, 2017 by ParticleSkull
lamer, nor marty ;)

[ParticleSkull 83]

Hey @anthonymcgrath,  are you looking for something like this?

FEM.ant.v1a.hiplc

[anthonymcgrath 71]

lol exactly hehe

 I'll give that scene a check shortly thanks @ParticleSkull

man i cant wait to dive back in houdini properly again soon!

[ParticleSkull 83]

Yeah, and I can't wait for your next project! I guess both thing's will happen at the same time

[anthonymcgrath 71]

@ParticleSkull yep i'll hopefully be having a go at doing something else hehe - got a few fun things lined up!

 

btw i couldn't get the random rotation thing working:
rand($PT)*360 in the copy stamp variable

tried a fit something or other - still nothing

 

in the end this worked:
rand($PT) * 33.3 * $FF

 

now my instanced fem things are rotated on creation.  It works sod it!

[Ebonit99 0]

@KarlRichter ... man you can not just post that without a link to a tutorial  

Edited January 10, 2018 by Ebonit99

[ParticleSkull 83]

Hahahaha, the file is awesome enough

I hope this post stays here forever

[Animatect 0]

Hey guys, hopefully I'm going to revive this thread ,  I checked @ParticleSkull's scene modified by @KarlRichter, almost all was clear to me but a couple of things on the SOPsolver, the first is; on thee first pointVOP the whole Idea as I understand it is to delete the first sphere so we can check if any of it's points are intersecting the volume, but what are we checking against for all the other spheres? What am I missing there?, my theory is that it does this for each one of the gorups or prims as if they were independent objects, but I'm fairly new to Houdini so I don't know if this is the expected behaviour.

The other thing is, I copyed the VOPS to VEX, and the second VOP works great, but on the first one (the one that deletes the sphere), it does not work, it's as if the theory I gave on the previous paragraph just doesn't happen here.

I'll attach the file, can anyone please tell me what I am missing?

Thank you in advance.

 

PushAgainst_02.hiplc

[Ebonit99 0]

Hi brothers . Can someone explain me please why KarlRichter's file is not working for me anymore ? 16.5.439 is my current Houdini build. I did a test with cloth and it is pretty simple and very stable. I think people who wants to do this effect should consider that.

flask.v1.Odforce.cloth.hiplc

[ParticleSkull 83]

Hey Marek, damn, it's not working here as well (on 16.5.405)

About the cloth, at the end it got some interpenetrations here :/

@Animatect, sorry bro, i totally missed your post! In fact i didn't really got what karl richter have done, i just knew it was working perfectly
Would like to check the file nowadays, i might understand that better, but, as Ebonit99 said, it looks like it's not working on newer versions of Houdini

[Animatect 0]

@ParticleSkull Hey Alvaro, thanks for replying, yeah, It would be nice to know exactly what was going on just for knowledge sake, it's been ages since I opened that file, maybe I'll open it again to see if I get an "ahá!" moment.