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Found 86 results

  1. hey chaps i'm trying to create a sim of some chips. I want a big heap of them to fall on top of a burger sim i've done! I've tried a few routes and just wondering what is the best way to go about this. I've attached a scene - its a basic setup of some chips model. I've made them packed and they fall. however they are rock solid and just clearly dont have an air of bendyness to them. what is the best way to go about this? I tried FEM ....making one chip... solid embed... multiple copies then run that. It seems to work in a fashion but soon as i turn up the amount of chips it becomes quite sluggish and also if some interpenetrate then you get wildly exploding meshes. I tried a wire solver but found the wires just seemed to do their own thing and not hold a shape or length. I have got the rbd packed working but of course its just simple shapes and they dont bend. I wondered if it might be possible to create a chip that comprises of maybe 5 simple boxes connected together with constraints? attached a scene file below - theres a fem setup in there and rbd packed.. chips_sim_v003_rbd_for_odforce.hip
  2. Caramel Goo Tear Apart

    Hi everyone, my first post, newbie to houdini but diving in! ive been trying to find the best way to achieve the classic mars bar chocolate caramel bar being pulled apart in close up detail, where the caramel slowly tears apart with strands becoming longer and thinner as it gets pulled. kind of like the classic bubble gum on the shoe type thing. FEM ive tried fem, but couldnt get it to become strandy enough and then completely tear apart. love to know if i continue to explore fem that it would be possible to make this effect. GRAIN SOLVER?? perhaps the grain solver with some noise determing the glue strength so natural tears become apparent in the grain block as they get pulled apart? FLIP: VISCOUS FLIP viscous sim perhaps might work? anyone experienced think this could be the way to do it? im hitting lots of newbie dead ends, so any help on which avenue will actually get me the desired effect, id be much appreciative. J
  3. I have a scene with two FEM objects. I want them to move towards world origin, collide, deform , bounce back and move towards each other again, collide, bounce back. Like a pendulum balls. between 5 and 10 collisions.I have used Magnet force with animated Activation by certain $FF == 2 || $FF == 150 ... But it is not sexy. Or very flexible. Can someone please have a looksi and help with some more clever magic to achieve pengilum balls collide like repetitive collisions? femMagnet.hip
  4. Houdini FEM stops at frame 800

    I am trying to sim a 1000 frames of a FEM coral with branches swaying in water currents. For some reason it freezes at frame 800. I checked all the DOP nodes, and couldn't find anything obvious. What am I missing? softCoral.FEM.paintWidth.h16p5p378.v27.hipnc
  5. Hi What is the best approach to use muscles system on existing animated geo from other application? I have animation, I have muscles baked out, I have skeleton or even bones if needed. My question is if i need to recreate whole rig in Houdini for a quadruped character just to be able to pin the muscles to the animated one and then following the mesh ? What is the best approach to use existing animations let's say in alembic and use some of the to drive muscles then using FEM or tissue system on top of it ? greetings djwitkac
  6. FEM - Can one use with glue?

    Hi guys, I've setup an Organic Mass FEM, with an active RBD producing the deformation. The RBD while deforming the FEM, pushes it out. I would like to have the base of FEM stuck to the ground. Is it possible to use something like Glue, if so, How? Any other ideas are totally welcome.. Thanks in advance Arun
  7. So I have this great cloth sim. but it has this small, high frequency noise that I can't seem to filter out without drastically changing the sim. My current working approach is to take the position into chops and filter it using a gauss filter and spit that data back out. It works reasonably well but as you can imagine it does drastically change other aspects that are working. The frustrating thing is that the noise is so easily visible and stands out so completely that I'm sure there is a way to isolate it but I can't seem for the life of me to thing of an approach. any help or suggestions would be greatly appreciated.
  8. I'm trying to simulate some relatively complex interactions between a squidgy, soft-body tentacle kind of asset and some arbitrary, sort-of-complex geometry. FEM seems like the best way to go about this - I've tried cloth simulation, but but there's little else that easily gives me the really nice volume-preserving properties I get out of the soft-body solver. Overall though I'm still kind of a noob at this, so I'd appreciate completely different suggestions on how to do this My main problem is that no matter what I do, I seem to very easily get tets being stuck on concave geometry. I'm attaching a scene that I've been using as a technical test to try and resolve the issue - it's pretty representative of the issues I get on more complicated scenes, but with faster iteration times. The objective is to get this sea cucumber to pass through a narrow, concave space in an organic, slippery, squishy way. Mostly it behaves correctly, but the problem is that eventually: Some of the tets will get weirdly stuck on the geometry The unfortunate thing is that increasing substeps and collision passes only seems to make this worse - with more collision passes, more tets seem to get stuck, and it becomes harder for them to get unstuck! I don't have any friction on either object, and ideally I'd want them to pass through each other really smoothly. Is there a good way of achieving that? Or anything substantially different I could be doing, to get the same effect? Would love any advice people might have! The scene itself: PenetrationTest_FEM.hip
  9. FEM object Cut

    Hello all, I'm playing around with FEMs and would like to implement it to my ongoing project. Idea is to create a "Cut the cake" effect. I have tried to use the shelf tools, but FEM build in fracture system is not as flexible as standard Voronoi. Could you please check out .hip and let me know if I can use controlled Voronoi fracturing for FEMs? Or maybe there is a more efficient way to tackle this problem? CutCake002.hip
  10. I'm pretty new to Houdini and I'm not sure whats the best way to approach this effect. Right now I have a thin cylinder I am using for the string and I converted it to organic tissue in the shelf. then I have a big soft body that I also converted to organic tissue, and placed it on a rotating platform. All of that works great and looks nice when it deforms. But I'm not sure how to attach the rope to the soft body so that it will begin to wrap around it. I tried using a SBD spring and that had no effect. Then I tried using the Stich cloth tool from the shelf. That worked great in "hard" mode, but the two soft bodies stopped colliding. Then I tried constraining the rope to a rigid body, and the constraining that to the bog soft body, it worked but the rigid body kept dragging everything around randomly. I attached my scene of what I have so far. Thanks! rope.hip
  11. Curve Force on Cloth / FEM

    Hiya, How does one get a curve force or other such custom force into a cloth sim? Trying to push some cloth grids along a custom velocity field. I found this setup but it doesnt appear to work in H15 Cheers
  12. Hi, I'm having problems with the tissue solver in H16.5 First, my computer crash if I use the default settings for the solid embedding section of the bones and the tissue. I'm using maxTet .1 minTri .005 and disabling the base size, that creates a decent tetra object. Now the animation stays static all the time and not following the animation from the skinned mesh Is there a tutorial? thanks in advance, -Alex
  13. Plant Dynamics

    Hi there! I'm tasked to do a simulation of a guy, walking through some plants. So I need to make some motion on the plants, as they're waving in the wind, but also collide with the character. My initial though was either Soft Body or Wire sim, however I can't get it to play. If anybody got any good suggestions, please let me know! Unfortunately I cannot share anything. Cheers, Jonas
  14. RDB ragdoll and FEM

    I have a baked agent and made a rbd ragdoll from it, and would like to throw it onto a FEM object(solid). When in DOP it wont interact with my FEM solid object. Anyone know how i can make my solid object react to the collision of the RBD? (I throw my RBD object using velocity on my rbd object). Let me know if i have not explained my self good enough.
  15. rbd and softbodys

    I'm trying to understand what is possible in combining rbd and softbody simulations. Or what the workflow should be to get a fractured object to break apart like in a rigid body sim but also be a bit squishy. Like how a pumpkin might break when dropped from 2 meters off the ground. I haven't been able to get this look with fem and fracturing as the individual pieces kind of stick together on impact and don't break apart the way rbd does. Is there a solution with the multi solver? or some implementation of the grain solver that i can't think of. if someone has a solution for this i would very much appreciate it if you shared it with me. thank you. B
  16. 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
  17. 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
  18. 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 :/
  19. 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
  20. 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.
  21. 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.
  22. 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.
  23. 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
  24. 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
  25. 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
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