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Found 230 results

  1. Sand Simulation

    Hi! I'm a student at NAD in Montreal and I'm trying to learn Houdini. I have a project in which I need to simulate sand on top of a falling rocks RBD simulation, which is on top of a FEM sim. (The FEM is the deforming ground) So I cached every collision objects with the CollisionSource node (with 4 substeps to match de grain solver). Now, if I simulate the sand, it explode on random frames. (see flipbook here: password: sandsim This is my second attempt and it still explode (at fist I used 10 substeps) Does somebody have any ideas on what could be the issue? Thanks MountainGrowth_47.hipnc
  2. Hello, I am wondering how i can take an object that i have fractured with glue constraints and sim'd and have Houdini automatically create a bone for each fractured object and skin weight it and bake the sim animation into the bones. I tried searching this forum and the interwebs and i'm not finding what i want. thanks!
  3. Glass rbd based on baked sim

    I've got a problem. I do rbd simulation of big and complicated building. For optimization I excluded glasses from this. After that I want to do second rbd sim for glasses based on baked sim of building. For that I need to constrain glasses to frames. And here I get a big problem: - glue network doesnt help because it cant work with streching, it use only impacts - hard, spring constraints works crazy P.S. I attached simple scene with example, we have baked rbd frames sim and need to constraint glasses to it. Thanks for help. frames_glass_v001_test.hip
  4. Hi everyone! I'm relatively new to Houdini, and I came across a tutorial which explained the bullet solver for H13. I am trying to recreate the effect that he got at 53:15, where primitives were deleted from the constraint network when a force over a certain threshold was applied. tutorial: As I understand, the SOP solver was changed in H14, and I therefore don't have the object merge node that he has. I downloaded the example HIP file and copied his node into my own project and managed to get it working, however I'd like to know how it actually works, rather than just copying and pasting! The data that the node is bringing in, is as follows: `stamps("..", "DATAPATH", chsop("relnode") + ":Relationships/" + chs(chsop("relnode") + "/relname") + "/" + chs(chsop("relnode") + "/relationship/dataname") + "/Geometry")` This isn't like anything I've come across so far in houdini - if anyone knows what this means, and could explain it I'd be very grateful! Best, Stephen
  5. Hi there. I have a small issue going on. I have a source emitting boxes as packed rbds. The boxes have different sizes according to the pscale value and that attribute is stored in the packed prims in the assemble sop. When I use a dopimport to read back the points and copy boxes on them, pscale value is gone, it looks like the dopnet didn't store it. Usually this is not an issue because the static geometry is transformed with the transform pieces sop. But here there's this issue with the pscale attribute. I attach a very simple setup that shows the problem in action. Thanks a lot! packedPscale.hipnc
  6. Creating a force array in vex

    Hi all, I am struggling to write a force array per particle, i have an float array per particle named "upforce" and i want to use this array as my "y" force. Any tips? Thanks
  7. Destruction & Fluid works

    Hi Guys, Sharing my last projects with Houdini (as a hobbyist), for getting feedback and critics ! Destruction of a building from drone shot : https://vimeo.com/208997392 Tornado destruction of a farm / barn : https://vimeo.com/169982113 Kind regards
  8. 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.
  9. I'm trying to sim a brick wall getting destroyed. I'm not just fracturing a box, but I've got bricks and mortar between them. The wall I've got at the moment has close to 26,000 pieces in it. Every single piece is packed with a unique name. The bricks are showing up as packed geo, while the mortar is showing as pack fragments (I'm guessing cos they're packed right after a voronoi fracture). So when I start the sim, it says "loading data" for a few seconds, and as soon as it starts calculating, I see my ram usage shoot up until it hits about 95%, and then my system locks up and I have to force shut it down. I've gone and reduced the size of the wall significantly, so that now there are just 3140 pieces, and the sim runs like a champ. I have a laptop with a 6700hq and 16GB ram. Is this simply a case of having too heavy a setup/not enough ram, or is there something I am perhaps doing wrong? I don't really have any idea of much is too much for this sort of thing. The closest I have is Applied Houdini - Rigids 2, but then I don't really know what the specs on Stevens machine so I have no Idea what to expect. Does anyone have any frames of reference so I can gauge how much my system can reasonably handle before setting up a sim and risking annoying crashes?
  10. RDB driven by POP network

    Hello! Firstly, I'm very new to Houdini (coming from Maya), so I apologize if this has been posted before; when looking for a solution I may have just not searched the correct terms. At 49:00 in the below video, Jeff Wagner demonstrates an RBD solver that is 'driven' or on some level involves a POP network. I want to achieve a similar effect. I currently have a shattered object (using another tutorial to create jagged voronoi). Additionally, I'd like to scatter points along the inside point group (from shatter) to create wires, Entagma recently released a tutorial that I can probably use. Getting curves that are affected by gravity would be a perk, but it might be beyond ability trying to make them dynamic constraints to the shattered pieces, etc. If I don't do this however, I might have an issue with them clipping into the geo. Thoughts on how to make them collide-able at least would be appreciated. Would love anything to point me in the right direction. Thanks!
  11. Spin force for RBD objects

    Hi Houdini friends, Sorry to bother you three times in a day... I'm still having issues with the simulation of leaves on the ground. I can't use POP for simulation because these leaves are in foreground and they'll hit the ground and stay eventually. However it seems wrangle torque or angular velocity on the packed points won't work, these leaves are not spinning around their own origin. Is there any way to fix this? I have the files attached that may better explain. Thanks a lot!!!
  12. It's time to dive into Houdini's destructions
  13. 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
  14. Hi guys. I have a problem adding wind force to RBD Instanced Simulation. As far as I use only one force gravity or wind everything is ok. As soon as I apply second force something wrong is going on. For example, my leaves flow in the air and small ones act like crazy and fly very far away. Only thing I notice that everything was going fine, until I added pscale attribute to my copy stamp node. Maybe I'm doing it wrong and it is messing with DOP. Best Regards, Tom
  15. I'm trying to get FLIP and Rigid Bodies to interact with each other. At the moment I've been dropping RBDs (both whole and fractured objects. No packed geo) into a deep tube of water and trying to get them to slow to a stop before floating back up to the surface. So far the best I've been able to do is get the rigids to collide with and move the water. The water has absolutely no effect on the rigids, and neither of the object's masses seems to have any effect on the sim either. I've also tried increasing the Feedback Scale on the FLIP solver (the most common suggestion), plugging the FLIP solver into the merge node before the RBD Solver, and changing it from "Left Affects Right" to "Mutual" (both these changes gave extremely explosive/unstable sims, and still didn't work), changing the rigid solver from bullet to RBD, and playing around with the various collision and velocity settings on the FLIP solver. Nothing worked at all. Does anyone have any suggestions of how to get FLIP and RBDs to play together nicely?
  16. Small RBD collision issue

    Hi all, I'm new in RBD and I have this issue. I fill a box with objects instanced by particles. The box is a collider in convex hull (per Set Of Connected Primitives because I splitted all faces of my box) My small RBD objects are in Convex Hull as well because Concave seems to act weird. The problem is the RBD don't stop spining on the collider If anyone has some tips it'll be very appreciated. I joined the scene file because it will be more helpful Thanks a lot ! croquettes_16_debug.hip
  17. Hi all! I'm currently trying to find a way that I can control when an attribute on packedrbdprims coming into DOP's gets written to from the "Overwrite Attribute from SOP" box and when it gets written to from the bullet sim I have set up. I have a set of packed primitives with rotation animation on them being fed into a bullet simulation, I'm also adding an "active" custom attribute which is being used by a SOP slover in DOP's with a vex wrangle inside it to activate them when the value equals one. What I also want to happen is have the orient attribute on each packedprim update from the existing vaules from SOP's right up until the point when the bullet solver takes over and begins writing to the orient value. I know that I can add orient to the "Overwrite Attribute from SOP" box but what I 'm hoping for is a way to disable this function for each object as they become active rigid bodies, essentially adding to the orient values that exist on that particular frame and continuing with the sims values. Instead of having the sim take the orient values that exist at the first frame or continually updating those values as the packedrigidbodys are influenced by the sim. I know its poor form but I'm afraid I dont have the project file on hand to upload, sorry guys :S hopefully I can upload it next week if anyone needs to see it. Any help would be massively appricated! Many thanks
  18. Hello guys a basic question for a simple problem... that im sure has a simple answer. Want to spring-constraint pieces of packed rdb objects (debris) to be driven by a group of animated points. Right now im keeping it simple just a one-to-one connection. Something similar to this: Sadly his test scene is not using packed objects Attached is the test scene i 've been using For some reason i havent got the answer and right now i am just going in circles Thanks for the help glue_cns_test.hipnc
  19. Hi, So I made an rbd sim where I had only 200 unique pieces. Then I made an rbd sim using 100s of each of these pieces. I cached the simmed points. After this, I want to place my unique pieces onto these points. What's the best and most optimal way to do this for the viewport and the renderer? I have seen many different techniques, I can't tell which one is the best. Should I just use Instance SOP? Should I save the first frame of the sim and use this instead? I can transform them using Transform Pieces SOP, but I don't know how to bring them optimally. Should the pieces be brought it as packed geometry, packed fragments, packed disk geo, or something else? I want Houdini to know everything is coming from these 200 unique pieces so it can show them more efficiently in the viewport and the renderer. I noticed if I save my pieces onto separate files as packed fragments, Houdini is saving the entire packed geometry onto each file that takes a lot of space. How do you do this? Thanks
  20. Hello everyone... I have a problem with an RBD packed object inheriting velocity. In the file, I have the attribute active being set by another object, but the velocity doesn't kick in at all. The velocity works if I remove the point wrangle setting active to 0 and remove the sop solver. If I try a pop vop or a geo vop, there's some weird velocity behavior that happens. If I tick on override attribute, the velocity takes off big time and doesn't appear that gravity takes hold. All I'm looking for is initial velocity once the pieces become active. I saw a few threads on the side fx forums and this forum, but nothing I saw seems to be working. Any thoughts? test_active_velocity.hipnc
  21. glue + RBD solver

    Hey! Houdini's manual states this about the glue adjacent tool: This tool only works with the Bullet Solver. You can change the type of solver in the Solver Engine dropdown menu on the Rigid Body Solver. So here's my question. Is there any glue tool that works with the RBD solver then? Thanks
  22. 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 :/
  23. RBD active value

    Hey, I'm trying to implement an old trick I used several times with older versions of houdini. Just trying to transfer a color attribute to some points placed in the center of the fractures pieces to use it as an active value in the dop network. Unfortunately nothings happenning. Some idea what could be wrong here?
  24. Hello, I would like to have some objects bouncing around inside a sphere. Is it possible to have the sphere geometry transparent but still act as RBD collider ? thanks!
  25. Pyro + RBD Packed, How collision works?

    Hey guys, pls help me understand what's going on here: Check it out, on the RBD Packed node I can only use Bullet collisions (there's no other option in there) and it looks like the Pyro solver is using something else, like a volume collision. In this gif the RBD uses Sphere as collision representation and it's working perfectly fine, colliding with the original box shape: the proof: and the options avaliable: bullet.pyro.v1a.hiplc
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