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Found 388 results

  1. I have some fracturing happening in a sop solver inside a dopnet on a simple booled piece of geo. I have the fractures working on the geo over time and all is good. The problem I'm getting right now is the bool is failing. It works as expected if I add a fracture to the geo before the dopnet, but I want the fracture to only happen in the sop solver using the conditions in there. Is it something with groups on the assemble node? or the boolean itself?
  2. Dop import not working

    Helllo, I am new to houdini and trying to experiment with rbd but I fail to use the dop import node properly. I am trying to fetch the geometry of the dopnet inside an sopsolver. What am I doing wrong ? Thanks in advance.
  3. Vellum Pin to Target with gravity

    Hey gang, I've run into a problem I can't get my head around. I have a Vellum cloth sim with a Pin to target constraint. I want the cloth sim to follow the target while also being effected by gravity and can't resolve making both the target cloth sim and gravity occur at the same time. Any insight would be MASSIVE help! Thanks. Hip is attached. Vel_pin_target_gravity.hiplc
  4. Hey everyone! This is my first post here! I have a scene where I'm caching a vellum grains simulation to a disk cache. I'm having trouble understanding why it takes so long. When I cache the simulation to ram in the viewport each frame takes about 15 seconds, however when I drop a File Cache SOP and save it to my hard drive each frame seems to take about 3 minutes. Could someone explain why this may be? I have tried saving to another drive and it didn't help.
  5. Hi, I'm starting learning houdini and really excited. I'm in still learning phase and searching ideas to do. So here is my problem. I have idea for connect two cables with a cable supported collision and simulation result. question 1: can i generate simulation result on parameter change. (i don't need whole simulation frames just need simulation result) question 2: i need generate cable(between two cables ) "according to grid collision" and "affected with gravity". so i'm newbie and just created with "add" sop and seems really bad. wires.hipnc file attached for review. I need advice and/or guidance. Thanks in advance. wires.hipnc
  6. How to export vdb's in the right way

    Hello, I have a massive smoke simulation going on, and now I want to export this simulation in vdb's, to import them into a another 3d software (Blender). But when I click on the cache button or render to disk button, everything goes well, until frame 70 +-10 frames or so.. and then it stops because I am getting out or RAM. As I have 64 GB RAM, I would love if someone could explain me, how can I export the whole simulation, without decreasing the smoke division size... or smoke quality! I have tried to just export the density field, but then the smoke looks kinda low res and only if I am exporting ALL pyro fields, like: density, temperature, fuel, vel x, vel z, vel y.... and so on, then the smoke is high-res in Blender. But if I am exporting all fields, then it stops after frame 70 because of the RAM... is it possible to cut this simulation in parts and exporting them seperatly or somehow optimizing the fields or the pyro sim or vdb's so that I can export the whole simulation without any problems AND in high-res quality? Thanks for advance Daniel
  7. Vellum - Sponge/Foam behaviour

    Hey Guys, For the past two days I have been trying to recreate this shot in vellum (Starts at 7 Seconds): But I cant seem to get it close! First I tried just squeezing strut softbodies with geometry but I could not get them to stay in place or have the right behaviour, then I went the inflation route witch also did not work since foam does not inflate like a baloon and generally keeps its shape. I thought I had found the solution with a vellum rest blend, blending between the original and the scaled up geo (I attatched the file), wich kinda worked but I could not get it to behave like the video. If you guys have any Idea how to achive this It would be greatly appreciated! foam_squish_V01.hiplc
  8. Hello all! I'm very new to this forum but I'll try to pose my question as clear as possible. Let me know tho if anything doesn't make sense. I have animated a raspberry falling into some milk. On that raspberry, I have those little brown-yellowish hairs sticking out (called stigma as I learned from Entagma). I've generated them with a Guide Groom and a HairGen Node and I have some adjustments on bend, frizz and stuff in the Guide Groom which I'd like to keep (so Bypass Editable SOP Network is not an option). I want to prevent them from being simulated like hair each frame. Best would be if they could be generated on frame 1 and then just stay exactly as they are, simply moving along with the animated geo but without deforming. Hopefully this is even possible with a hair sim. (btw: i've already fixed the scattering of the hair using the uv attribute so at least they're not jumping around) Thanks for any help in advance!
  9. I stumbled over a problem with the transform pieces SOP when i use a timeshift between two simulations. In my setup i simulate the pieces with a rigidbodysolver, extract the points with dopimport, transfer the pieces onto those points and simulate over the pieces again. And the final step is a transform pieces. This works fine, as long as there is no timeshift between the two simulations. When i introduce a timeshift, the transform pieces SOP places the pieces nowhere near the extracted points. nested-sim-timeshift-2.hipnc
  10. Houdini.School Velocity Forces

    I am happy to announce that https://www.houdini.school has launched and you can get 15% off now through July 27th, 2021. I'll be joining a host of talented Houdini teachers, like: Debra Isaac Kate Xagoraris Beck Selmes Christopher Rutledge Justin Dykhouse Jeffy Mathew Philip Nicholas Ralabate You can learn more about my Velocity Forces class here: https://bit.ly/houdinivelocityforces Teaser video for my Velocity Forces live class: https://vimeo.com/577928177
  11. Hello! This is my first time posting here. I am a graduate student currently working on a project that involves a character comprised of rigid objects that can assemble, disassemble, and rearrange itself. The parts can also blend between dynamic and keyframed states. I have a method for the state switching, but I cannot seem to find away to apply any attractive or guiding forces to the parts when they are in their dynamic state. I found a way to do this previously by using a POP Attract node, but it only worked with Rigid Body Solver. I'm not sure how to apply that same node to a RBD Solver. If any knows how to make that work or knows a better method, I'd appreciate it. The goal in this test is to make the ball roll towards the cube and fit into one of the sockets. I have attached a zip file with the assets and .hip file. Thanks in advanced! RBDTesting.zip
  12. Hi, I'm considering updating my local ethernet LAN to a 10 gig ethernet lan. Right now, I'm on an old 100Mbps LAN and it's too slow to playback simulation caches over the network. I've been seeing that people are using 10 gig networking at home now and are able to play back video, do video editing over the network with it. I'm wondering, if anyone is doing this, how is simulating to cache files, reading/writing cache files, on a 10 gig local network? Is it like working on a local machine?
  13. Gas Disturbance

    Hello, Following a tutorial about dynamic cloud simulation i get weird result applying Gas Disturbance operator since in houdini 18.5 have different parameter and totally different behaviour that what showed in the course (recorded in H17.5.258 ), any hint on how to set it so it behave like older version? In specific: Binding have not "Disturb field is vector field" option "Cutoff" parm in Disturb setting mode "Block based" have now a lot of new parameter realted to noise that doesn't exist in older version Control setting doesn't have "Control influence " parm Thnks!!
  14. Free video tutorial can be watched at any of these websites: Fendra Fx Vimeo Side Fx Project file can be purchased at Gumroad here: https://gumroad.com/davidtorno?sort=newest
  15. I`m currently working on high resolution of flip simulation but sometimes it`s crashing middle of the simulation and i think it`s memory problem(I`m doing something else while simulation) And i realize that .sim file is can save the simulation progress and i can start up with .sim file to resume the simulation. But during simulation saving whore simulation to save .sim is very waste of disk, saving time,, extra So what i want is after the simulation is done or houdini is crashed or user stopped the simulation, i want to save last of 1~2 frame to resume the simulation! Is there any way to do this?
  16. Digging Hole

    Hello Guys, it's possible to make in houdini simulation of digging hole in terrain surface? I mean my character have shovel and i wanna make simulation where shovel dig to the material and he takes piece of material on shovel. It's just a question i have a idea to make something like short film. And this is one of the scene. Like in Mafia 2 where Vito with Joe digging hole for dead body in his car. Thanks
  17. Hello Everyone, I am currently struggling with a personal project. I was trying to figure out metal deformations in Houdini using Bullet solver and constraint switching (switching back and forth between glue constraint and soft constraints). But I am not satisfied with the results of the simulation. Is there any way to blend custom animation to guide the entire object in a specific way while allowing for deformations to take place? A perfect example would be a car hitting an object and continuing along its path with deformations. I've tried a lot of techniques without any real success. So far the closest I was able to achieve was using a pop wrangle to get position data from a SOP path, calculating the difference using the current position in the simulation and the position from the SOP path and then adding it as velocity. It works somewhat like an active guide, but the simulation always lags behind the animation or the velocity keeps escalating out of control. Could really use some fresh ideas. Thank you in advance.
  18. Hello, Noob question here, I have a vellum plane being affected by a popwind force, I don't like the current look of the simulation, how would I change the 'seed' of it to change the results? Thanks!
  19. Free video tutorial can be watched at any of these websites: Fendra Fx Vimeo Side Fx Project file can be purchased at Gumroad here: https://gumroad.com/davidtorno?sort=newest
  20. Hello everyone. I have been using Houdini to Niagara on several projects for now and it works fine. However i started to want to time stretch / duplicate points and most importantly loop my sims. I do it with a couple of time remap nodes in Houdini. Of course it doesn't work within Niagara. (the sim ends in the middle, exactly where the "end" of the sim is and the second part is not showing up). I tried to alter a few attributes ( age, life ) with no success. I am wondering if there are intrinsic attributes that should be changed in order for this to work? thanks! looptoNiagara.hiplc
  21. [SOLVED] Tree Sim Deform

    Hey everyone, I'm trying to make a tree simulation. I'm using wire solver, but I can't figure out how to deform the tree geo with the simulated curves. I tried wire deform and point deform, but the result is strange. Do you have any idea? tree_deform.hiplc
  22. Sparse pyro distributed simulation

    Hi, I was wondering if there is a way to distributed sparse pyro simulation. You can easily distribute with legacy pyro by distributing the container by slicing. I mean yeah... there is a predefined container that gets sliced in legacy but sparse create bounds on demand that is why it can't distribute in sparse since there is no predefined container(bounds). But has someone cracked this...? Simulation sparse on multiple machines
  23. Hi everyone ! I was wondering if it was possible, on a geometry deformed (by a point deform SOP) to simulate only parts of the geometry that were masked with vellum ? (if needed, I uploaded a scene with the mask I want to simulate). Thanks a lot for the answers ! Vellum_on_mask.hipnc
  24. Free video tutorial can be watched at any of these websites: Fendra Fx Vimeo Side Fx Project file can be purchased at Gumroad here: https://gumroad.com/davidtorno?sort=newest
  25. object vs data in DOP network

    are there any good resources to explain these two subject? object - data what are they exactly and what they do inside DOP network? any pages of documentation or any piece of information you give me is acceptable
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