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pan.mentolka

Organic Mass problem

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Hello houdini masters!

I have a problem, with this simulation. It makes me those problems, which You can see down in those pictures. Can anybody explain me how to fix them? 

SHORT EXPLANATION OF THE SCENE: I created 5 human heads, closed inside the box (the box has wireframed edges). Those heads are Organic mass and the box is coliding static object. Heads are squeezed inside of that box.

 

ISSUE:

It shows me the tetrahydrons on the surface of heads, which is bad, i need smooth surface on those heads, and I also need material, which should look like rubber (i set up rubber material, but i tried make it a little bit softer) and also a want to make it softer in parts like nose and ears... And also i don't want let the surface come througth them selves (i turned on self collision, so I dont know where is the problem, and why material is sometimes doesn't coliding)? I hope I explained the issues, which i need to fix. 

Thaks for any advices! I really appreciate them ;)

 

THE .hip FILE WITH SCENE IS IN forum.rar TOGETHER WITH MESH HEAD MODEL

forum.rar

1.jpg

2.jpg

3.jpg

 

Edited by pan.mentolka
visual, gramatic / editing

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9 hours ago, purple_odforce said:

Were you able to solve the problem with the nose? I am also trying to make a head and neck where the neck and nose are softer than the head.

-P

Im quite new in houdini, so i really dont know how to solve it by noise, have you any suggestion/ advice? 

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14 minutes ago, pan.mentolka said:

Im quite new in houdini, so i really dont know how to solve it by noise, have you any suggestion/ advice? 

I wish. I have been looking all day and I cannot figure out how to do it. I have tried painting maps but I just do not understand how to use them to drive stiffness. The online documentation also does not seem to help.

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1 hour ago, Noobini said:

why don't you just use Vellum instead ?

Are u sure that this will be helpfull? I will try, but Im still using houdini 16, and vellum is new way ...

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old slow  vs  new fast.......can't tell you what to do but I know which one I'd pick

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6 minutes ago, Noobini said:

old slow  vs  new fast.......can't tell you what to do but I know which one I'd pick

I will try, and then i will report about. 

Thx merry christmas!

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here...naturally, you'll need H17.....it runs quite quick even on my crusty old i7 4770K

(if you ignore the ultra hi-res heads....just put your display flag on the vellumsolver...it should run like lightning...only when you need to deform the hi-res heads that the lag comes in)

 

vu_squeezeheads.hiplc

Squeezeheads.jpg

Edited by Noobini
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On 23. 12. 2018 at 11:51 PM, Noobini said:

here...naturally, you'll need H17.....it runs quite quick even on my crusty old i7 4770K

(if you ignore the ultra hi-res heads....just put your display flag on the vellumsolver...it should run like lightning...only when you need to deform the hi-res heads that the lag comes in)

 

vu_squeezeheads.hiplc

Squeezeheads.jpg

Thanks, I tried, but it still doesnt look good (the result is so squishy and flat) i read that its possible to fix it with vellum soft bodies, and its also so much faster, so do you know, how to work with? For me its calculating more than 20 minutes per frame, do you know how to make it faster?

http://www.sidefx.com/docs/houdini/shelf/vellumsoftbody.html

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I'm speechless.....like, do I have to come up with a solution.....THEN serve it on a silver plate too ?

did you look in my file  ? why do you think I used struts ? FMD, even my old machine is simming like a frame per second...that's using your ridiculously high-res heads...for pointdeform. Without the pointdeforming the highres heads...the whole sim would be over in a few seconds....

Christ...I don't normally use the lord's name in vain...but hey since it's Xmas..........Christ Almighty.

 

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9 hours ago, Noobini said:

I'm speechless.....like, do I have to come up with a solution.....THEN serve it on a silver plate too ?

did you look in my file  ? why do you think I used struts ? FMD, even my old machine is simming like a frame per second...that's using your ridiculously high-res heads...for pointdeform. Without the pointdeforming the highres heads...the whole sim would be over in a few seconds....

Christ...I don't normally use the lord's name in vain...but hey since it's Xmas..........Christ Almighty.

 

Ok, so let me apologize, for my stupid questions. Im sorry! I really appreciate your advices!

Im quite new in houdini, and I still do not know how it works in 16 and also 17 then. But can I just ask you, how can i add wind force (the turbulence - because in velum solver i cannot set turbulences, but only one vector direction)? I tried to analise your file almost whole night but i still do dot know how to make my geo (heads) in simulation, stiffer.......

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while you are tweaking, just put the display flag on the vellumsolver and not on pointdeform.

dive into the vellumsolver, add a POP wind above the null, connect to the null, adjust wind parameters...tho I don't really see the point here since you said you want the heads to be stiffer....they're not like cloth....so I can't see the wind being useful.

Go back out, in the vellumstruts, just crank up Stretch Stiffness as you see fit, or first to clearly see the diff, lower it to 1 and you'll definitely see it flops like cloth.....then crank it up to 10000...or so....and see the diff...then just keep adding zeroes till you're happy. you can also try adding more Constraint Per Point, currently at 10, this builds more crosslinks inside the mesh...ie. internal reinforcements (which is approximating FEM, I'm guessing here, have NEVER done FEM, I started with H16.5).

Only when you're happy with the lowres sim with the vellumsolver, then put the display flag on the pointdeform to affect the high-res. As said even on my old PC, this would run at about a frame per second......NOT 20 minutes.

If you feel the low-res geos are 'too low', then in polyreduce, increase Percent to Keep...to maybe 5 ? but the higher it is the slower the sim...ie. we want to stay away from simming something that is high-res since it's slow/expensive....and the higher res it is....the harder it would be for you to stiffen it up.

Edited by Noobini

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