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Found 355 results

  1. Vellum grains problem

    Hello friends, I just try to build up a little rbd-vellum grain scene where some geo is interacting with the grains. So far so good. The meshes interact with each other and the solver works. BUT I have no clue why the grains start collapsing in the first frames when starting the simulation. It seems that there is a particle separtaion between the grains that is presolved first or before everything else happens. Does anyone know a solution how to fix this issue or give the grains a "sleeping state" before it collides with the geo? I already tried the popawaken after the vellumsource but with no effect. Thanks in advice, Sebastian vellum_grains.mp4
  2. Dear all, The plot : -> Am currently simulating a simple shatter with rbdPacked prims + Constraints Glue + a gorund plane, all into a DOP. (nothing Awesome till here). The Questions : -> But, strangely, the little rbds continue to vibrate once fallen on the ground. It looks like continuous vibrating tiny giggly wiggly inter-collisions. Did any body ever had this ? Would it be possible, i've to FORCE STOP them using a desactivating VEX snippet in a DOP/geomety wrangle node ? If anybody had this one time, let me know, please. You will be welcome and it will be pleasure to discuss that point you. Thank you all a lot, cheers.
  3. RBD Jittering Velocities

    Hey guys, I've got this simulation of a wall where a train is wrecking through a wall. Some fragments hanging at the wall are still jittering afterwards. The jittering itself is no problem because it's minmal and the camera will be shaking. But the jittering velocities are a problem because they disturb our motion vector pass (generated through Maya Arnold) and cause it to flicker. Is there a way to leave the simulation as it is and "repair" the velocities? I tried a filter for the low velocity values, but they are not precise enough. I uploaded some Frames of the wall as bgeos: https://drive.google.com/open?id=1Re5YiuvD8KaTe56XRehdGMfcQmV9b8sA Thanks for the help!
  4. FBX to UE4 no animation data

    Hello! I am trying to import a cached rbd sim to UE4 as an animated fbx, but when I import it to UE4 it says the fbx "has no animation data". When importing to unreal, it does detect the start and end frames correctly (and auto selects skeleton mesh as it should) and create an animation asset but it does not play the animation, only the first frame. I am using Houdini 17.5 and Unreal 4.22 I have attached a simple example file, I am using the gamedev tool rbd to fbx in the out context to write out the fbx Not entirely sure if the issue is on the Houdini side or the Unreal side, any help would be appreciated! fbxtest.hiplc
  5. Grains and RBD mutual interaction issues

    Hi there I am trying to get rigid bodies and grains to mutually interact however the grains seem to invoke a disproportionally large amount of force onto the rbd object causing it to fly off into the distance It works fine using one way interaction but not two way. Please could someone more experienced in the matter help me Thanks a bunch For some reason this jammy dude's scene works fine (I'm assuming his is two way as that seems to be the shelf tool default) grainsWeirdness.hipnc
  6. Hey guys, I'm pretty new to Houdini and I'm doing a train crashing through a wall. Currently I'm trying to export the animation of the crashing wall (via Alembic (~600mb/frame) to Maya Arnold to shade and render it. Viewing it in the viewport of Maya is no problem but as soon as I try to look at it in render view Maya freezes. Is there an easier way to export the crash Animation of the Wall to Maya? Or some option in Maya to make it easier? I fractured the wall with some detail with the RBD Material Fracture Node and unpacked the dopimport before I exported it to an Alembic. In the hip file is only the fractured wall for testing Thanks for the help wall_test.hipnc
  7. Exploding Fruit!

    Hello, there good people, I really need help with this subject and I don't know what am I doing wrong to not get my replies on my posts If anyone knows why please help. Anyways I wanted to get a fruit to explode and be squishy, So Fracture RBD isn't really an option. And when I try FEM you can't really create a shell object as it fills the whole object with tets. Plus FEM is so slow and unstable -Don't know if I am doing something wrong-. Also, a sidenote how do I add custom exploding force to FEM Sims. Thank you so much in advance and I really hope someone helps me out as this is driving me crazy.
  8. Hey everyone! If we have particles colliding with an object and bouncing off, we can transfer colour to the hit position. Once the particles have bounced off the object, the colour is also removed. How do we get the Cd to remain on the object once the particles have bounced off? Any idea would be great! thanks
  9. Simple RBD hanging

    Hey everyone ! I'm miserably failing at making a simple dynamic set up : / I'm trying to hang a RBD object at the end of a rope. I can't get it to work with wire solver and bullet. I've only managed to attach the rbd at then end of the rope, but the attached rbd isn't affecting the rope. And with vellum it works, but I don't want a soft body object. I tried with vellum, thinking I could stiffen the softbody until it looks like a rigid object, but vellum bugs with I reach high stiffness value ! And anyway, I don't know how to replace that softbody by my final object : / If someone could help me back on the correct track, that would be great attched is a hip file with my 2 failing attempts.6ril_RBD-hang++.hipnc
  10. Senior FX Artist - LA

    Looking for a VFX artist experienced in rbd destruction simulation effects with thinking particles/Houdini as well as a Nuke/fusion compositor for projects. Must be local to LA and able to work onsite. Please send resume/reels to camarenamusic@gmail.com
  11. RBD's and SOP Solver

    Hi peeps, I'm using the SOP solver DOP to change my geometry overtime from one sphere to multiple spheres, however, when the geometry changes to multiple spheres it's still behaving like just one object instead of individual spheres and I can't figure out why! Any help would be much appreciated and I've attached the troublesome scene file. Also, I used the RBD Fracture object for this instead of the RBD packed, because I couldn't get the results out of the SOP solver to work with RBD packed object. I unpacked the geo in the SOP solver and repacked the output with the name attribute and it wouldn't work, so also, if anyone could shed some light on that as well it would be much appreciated. Thanks. RBDs_SOP_solver_testing_01.hip
  12. Slight Seams in Fracture

    Hello everyone, I'm currently playing around with a Sphere breaking through a wall; quite a simple setup but when it comes to rendering out, I'm noticing some small seams around my fractured area. As I'm not able to figure this out, I'm asking the community for some help or a hint in the right direction. thanks Using Rigid Body Dynamics.hip
  13. Animated colliding objects

    I have a project coming up that will require me to hand animate objects but get them to collide with one another. I'm an experienced Houdini user but setting up DOP simulations has never been my strength. I've attached a hip file with the basic situation here: moving_furniture.hip Furniture will be sliding around, probably animated by hand. The objects need to bump into one another and react naturally while doing their best to follow the target animation. I had assumed that this would be some sort of combination of RBD objects, proxy Geo & pin constraints, but I've been unable to understand how to wire it up. There are so many great examples using this sort of thing but nothing that really explains how to combine following constraints that are animated in world space. Thanks so much
  14. Duplicate objects in RBD pop net

    DOP net question. I want to start with a set number of boxes and have them move around with POP forces and bounce off each other with RBD. Problem is that I end up with two items for each one I put in. For the POP source I setup Impulse activation to be $F == 2. If I use 1 there, I only get one set of items but they aren't effected by the POPAdvect forces. Feels like a rookie mistaken, but I not sure how to set it up. Any ideas? POP Source: Emission Type is All Geo, Geo Source is First Con text RBD Vector Field.hipnc
  15. Hello guys, theese days I'm working on a project about swarm behaviour of fishes. I made a particle setup, than I copy to points node for change particles to animated abc. But I have an issue about it, the movement of fishes are so noisy. There is any way to do it make them smooth, and more natural. By the way, sorry for newbie question. Thanks for attention. fishes_swarm.mp4
  16. Hi, I have a simple rbd setup where a ball hits the ground, I 've created a low res version to sim, using polyreduce and would like to transfer the information to the hi res pieces. I've tryed copying the primintrinsic 'pivot' and 'transform' and 'P' attribute. The hi res geo moves to the pivot of the low res witch is slightly different. Any one knows how to fix this issue? I've attached the file. Thanks so much, Ceci copy_position_to_hi_res.hipnc
  17. I am working on a big destruction job and I’m trying to optimise our workflow as much as possible. my usual workflow: - cache a single frame of my fractured geo as packed fragments - import rbd sim and create point per rbd piece (dop import) then lighting would import these two caches and use transform pieces. This works well since we only cache a single frame of the fractured geo, and the cache for the rbd points is very small. however the geo is still written into the ifd file every frame, which can be quite large. So, is it possible to specify the geo needed for the whole sequence and then have mantra transform the geo at render time (the same as transform pieces). This would make the ifd’s tiny an alternative method is to write each fractured piece out as a separate file then copy empty packed disk primitves to the rbd points then use the unexpandfilename intrinsic to expand it at render time. This makes tiny and fast ifd files which is great but seems quite slow to render - probably because it has to pull so many files from disk (1000s of pieces).. is it possible to do the render time transform pieces approach or does anybody have a better method? (The two I’ve mentioned are fine I’m just trying to optimise it!)
  18. Hi guys, I'm trying to save out a file cache of a simulation and then import it into a different DOP net to use it for collisions with particles without the particles changing the file cache Geo. Any help would be super appreciated.
  19. Stick RBD Objects On Collision/Impact

    Hi guys, Just wondering if anyone out there could give me a hand or point me in the right direction for something I am trying to achieve with an RBD simulation. Basically I have created a fracture simulation which gets launched at a character and I'd like to be able to stick the pieces into/on the character. I have been trying to investigate dynamically creating glue constraints but have hit a bit of a wall. I have seen that I can record impact data but I am not too sure how to process this in a way that would then lock the RBD object to the collision object. Any help would be super appreciated.
  20. I make this popped up in ground ice spike animation. but that's an impact at the move on human, constraint line was broken. how can I fix the RBD node? or need an addition to other nodes? ps. plz addition to catwalk fbx in agent node. frozen_walk.hipnc Catwalk_Walk_Forward.fbx
  21. Hi I've got some geometry and want to use it as collision geomtery. when I change this geomtry to volume using by vdbfrompolygons node, It looks like second pic. I think It's because of unfilled geomtry, but problem is All geomtries I've got are unfilled like this one. My purpose was make geometry to volume and use it as volume sample at staticobject node in dopnet. How can I fix it ? or If you know other efficient ways to make unfilled geometry as collision geometry, let me know please. Thanks for read, My English is poor sorry
  22. Multiple Constraints on One Object

    I was wondering if anyone has had experience having multiple constraints on the same object and breaking them apart separately. the effect I'm aiming for is to have a some large rocks be ripped of a section of rubble and while in the air start to break apart into smaller pieces. I've tried setting up my constraints based on the groups created from the Voronoi fracture and sub fracture nodes, however this causes problem when trying to disable the constraints in different areas. Any ideas? ConstraintsHelp.hipnc NewRubble.abc
  23. Lazy, but I wanted to get a lot of rocks. I fractured a box, this is the exploded view, how do I save the individual rocks as obj?
  24. Hi guys, How do I hook up the glue constraints with RBD Material Fracture? I can't seem to find much on this. I have set my passive objects and they are passive as expected, and then as a workaround Ive used the Glue Adjacent pieces tool, but that doesn't seem to be working as well. Im sure it's basic stuff however finding it hard to get these glue constraints working with either the Material Fracture or regular Glue Adjacent pieces. test.hiplc
  25. Material Fracture Bullet Glass

    Hi, I try to make a car glass bullet hit... I can't figure how to make the connected pieces which stay attached to glass, I tried "soft constraint" of the "Material fracture node, but I can't figure how to break the soft constraint in some distance, pieces always returning back no matter how far they are.. which looks more like a STAR GATE portal opening Sklo_TEST_11.hip
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