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Found 96 results

  1. Dealing with FEM + Static Body

    Good night, people: I'm a newbie with Houdini. I've tried lots of tutorials but, I'm still having problems with collisions. I made a simple setup, a growing fem ball inside a static collider, but, it interpenetrates the walls of the static object. I tried to get more substeps, to have more detail in collision guides, but I'm not sure what I'm doing wrong. I attach the file that I'm working on. Thanks! testme.hipnc
  2. fem object pushing pyro smoke out the way

    hi all so i'm trying a little test - a simple fem object that moves using target to help it along i want that shape to interact and push some pyro smoke out of the way... does anyone have any ideas? I'm wondering if i need to cache out the fem sim first and fetch that in then use it as a deforming geo? apologies as i cant share the scene as i'm at office pc :/ edit: I found this link below but i dont know if i'm over complicating it really... https://ceyhankapusuz.com/2017/01/20/houdini-solvers-mutual-interaction/ ta! ant
  3. Cloth/FEM and RBD/Bullet interaction

    Hi I've been searching the forum on this topic but didn't find much. Is there a way to get a somewhat correct collision behavior between the cloth solver and the RBD solver running parallel in the same DOP network? I've a bunch of cardboard boxes that's suppose to stack on each other. I'd an idea that the cloth boxes that had come to rest would switch over to be a RBD objects instead, to optimize the sim. But first I got to get the solvers to interact. Any ideas? A simple test scene with the setup is attached (without the switching stuff). Thanks / John Edit: Ops double post :/
  4. I found some threads asking similar questions but in Houdini 15.. things seem to be different enough in 16, that a noob like me can't figure out how to carry that info over to 16. I have an animated .FBX model from Mixamo. It's a dancing male character. In short, i want him to dance as he does but for his neck and head to be finite elements (soft body, rubber like). So as he dances around, his head is just flopping around everywhere. Seems simple enough.. would anyone be kind enough to assist me? Thank you! I'm including the project file even though it's literally just the dancing model: Dance.hip
  5. Hey there, how would you go about changing the animation/simulation state of e.g. a cloth sim? I tried the pin to animation attribute to release the cloth object from the animation; but bringing it back to follow the animation is harder. it just snaps into place when I put the attribute back to 1 in the sop solver (dops). Also does anyone know a way to mix between animations and simulations? Lets say the cloth object is meant to somehow follow the movement of a master object but also should react to some forces. Or in other words: object is moving fast = animation state; object suddenly moves very slow = simulation state; objects moves out of the frame again = smoothly go back to follow an animation. The pin to animation attribute isn't allowing 0.5 values or so.
  6. Squashy effect

    Hi node guys! I have a question that i breaking my non-programing head. I have this points selected based in the bounding object, I would like to push them out and make it look like is Squashing against any object in his way. I'm not using FEM because it didnt work in this case, actually dont know why. Thanks for any help or idea you can give me Jason.
  7. Squashy effect

    Hi node guys! I have a question that i breaking my non-programing head. I have this points selected based in the bounding object, I would like to push them out and make it look like is Squashing against any object in his way. I'm not using FEM because it didnt work in this case, actually dont know why. Thanks for any help or idea you can give me Jason.
  8. Hi, I would like to use FEM (or soft body) on multiple objects. Basically, I used the copy SOP to copy objects on points. If I use the FEM after the copy SOP, they are merged together. The sollution was probably on this post but the link doesn't work anymore : Thanks, Charles
  9. Hi, I am doing some more FEM testing and have found that if you are using a target object then you can't use solid fracture as well without pieces jumbling up. Anyone know a way of fixing this. I have attached an example scene, if you enable fracturing on the solid object then you will see what I mean. Thanks Graham FEM_break.hip
  10. Create multiple FEM over time?

    Hey guys, I need to fill an object with some FEM spheres but: - I need the spheres to be a copy of the same FEM sphere; - I need it to be generated at the same place on every 10 frames or so (and fall due to gravity); Does it make sense? Here's the basic idea but with 1 sphere only, I'd like to keep generating them until the beaker is full File is attached Cheers, Alvaro beaker.v1a.hiplc
  11. POP EMIT FEM

    Hey Guys, I am trying to get POPs to emit a finite element. I have a simple setup where I am birthing a particle every 50 frames and having this fed into DOPs where the finite element solver takes over. The problem is I cant seem to source more then 1 instance of the object into Dops. I have attached a scene file I hope someone can help. Thanks, Clive Balls_Test_Fem.hipnc
  12. Hi all I have some problem about FEM collision. In the attached image below, the red part is my input target geometry and constrained by "FETarget constraint". When the target geometry moves very fast, my solid object penetrate itself. I have tried to turn on "collision with connected components" and also increase collision sub-step of FE solver, but it still doesn't work. Is anyone has better solution to improve that? Thanks. Archive.zip
  13. Hello, In Houdini 16 is there a way to add a spring constraint to a Coth object. Want to simulate rope/cable anchors. A standard pin constraint with Soft doesn't feel like the cloth is tied down by rope and would also like to have that Max length parameter. Alternatively, if I can use a Wire simulation to be used as a spring constraint that would also work. However, my attempts at doing this have been disappointing. Wire sim would either become the dominate force by pulling the cloth down like a lead weight or the cloth with pull the wire like taffy, And large values were used in the wire setting to no avail. Any thoughts? -Thanks
  14. Fracture Threshold in FEM

    Hi guys, I wanted to do some soft body ripping effect and FEM seemed to be the best tool for the job. I'm having trouble holding the fractured pieces together until impact however, and it immediately breaks apart when gravity is active. Do I need a constraint to hold the pieces together like as one would with a typical RBD/Bullet set up and break them in a SOP solver? I figured that the fracturethreshold attribute is the clue, but I tested with values as high as 20000000 and as low as 0.00000001 with no visual changes. Thanks in advance!
  15. pushing FEM object using pyro

    Hi everyone, I am trying to bend some trees using a rocket exhaust. I have created a pyro sim for the rocket exhaust, which I have cached cached. I have also created trees in L-systems and made them in to FEM objects. I have been able to use a magnet force in the FEM simulation to deform the trees, but I want to use the pyro sim to force the trees to bend. I assume this is possible, but I do not know how to connect the cached pyro sim to the FEM simulation. I have been trying to use the FieldForce DOP with a SOPvetorField plugged into the data, but I have no idea how to configure these nodes. Can anyone help me with getting this to work? Thanks! Dan l-system_test_04.hip
  16. I'm scratching my head over this issue. My FEM object is slipping through the animated Static Object slowly as it spins. The Static Object is set to "Use Deforming Geometry" and does not act as expected. FEM_slipping_through_StaticObject_slowly.hipnc
  17. use of Energy Attribute - FEM

    Hey guys, About this energy attribute, I think I could make a good use of it but I don't know how to access it. I mean, I can see it in the dops geometry spreadsheet but it doesn't get out there. I can't see it in sops. My main doubts are: - Can I bring this attributes to sops? (dissipationdensity, kineticdensity, potentialdensity) - Can I use it in dops? (use it as a multiplier for some other parameter, like the fracture threshold for example) Thank you fem.energy.v1a.rar
  18. FEM Copies (for Optimization)

    Hey guys, I have this scene with a lot of berries falling. If I select all of the berries and aply a FEM (shelf) at all of it, the action gets very slow and causes closer berries mesh to "fuse" one into another. The reason it gets slow/merge is the solidembed thing. It takes too long to make it for all the berries. My doubt: is there a way to make only one FEM berry and then make muliple copies of it, this way it doesn't have to tetrahedralize all of the berries? Thx, Alvaro
  19. Hey guys, sorry for the urgent title, got my second Houdini job and I have to do some R&D in the next 4 hours to the client. They want me to do something like this but in a human body: I have an idea on how to do this in Cinema 4D, but don't have much experience in dops at houdini (I guess this will be dops cloth related? The other reference client gave me is this one, I think is some FEM with constrains in parts like the foots, I might be wrong, if so, how can I add forces to fem? just dig into the autodop and add ie: wind? like popnet works? Then it will a matter of play with stifness and parameters I think Any help will be highly appreciated, I'll start doing my tests now. Thanks!
  20. Maya Rig -> FEM

    Hi all, I have a rigged character from Maya from which I did a Ragdoll sim and all is good. However now I want to do it as a FEM sim instead, to get some bulging when the character gets hit by an object. How would you go about doing this? While still having constraints on arms, etc. Thank you very much in advance. Cheers, Jonas :-)
  21. Hello I'm new here just trying to figure out how Erik Ferguson is doing these FEM solvers with these little tugs on his meshes like so/ Been trying to figure out for about a week and also trying to incorporate some rigged elements into same pipeline. Anyone have a clue? Everytime Import the Geo or trail into the solid node nothing happens or houdini crashes Thanks again.
  22. FEM Fracture Attribute

    Hello! In this Masterclass, at 41:00, the teacher explains that fracture parts of the object can be localy modified using an attribute. So my question is about this : how do you control what part of the object will fracture? is there a way to connect the FEM solver to a voronoi attribute or anything like that? Thank you for your time!
  23. Hi everyone! trying to figure out how to adding tetra during FEM sim, i got a FEM/SOP solvers plugged into multiple solver, no prob to delete tets, but can't add to the sim... the doc says " You can change attributes and even topology (adding and removing tetrahedrons) of the object’s Geometry data using a SOP solver. The Finite element solver can cope with the simulated geometry changing between steps. " here is a basic file, if somebody can help me it would be great!! thanks by advance Best FEM_ADD_TETS.hip
  24. FLUID FORCE NODE

    Hello! Do some of you sometimes use Fluid Force node? I want to have my fluid having influence on meshes, and I cannot manage to set the node properly. If you use another method for this, I would be happy to learn it. Thank you! leafNdrop.hip
  25. Hey guys, I tried to import a fbx from mixamo (walking animation) and wanted to add some fem, but as soon as I add it the walk animation stops, there is a way to have both things? Thanks!
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