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Found 177 results

  1. 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.
  2. Greetings! I'm trying to attach a vellum sim to a pop sim... The idea is that I first do a pop advection sim then attach vellum cloth to that so they collide and interact with each other... It's almost there, with one slight issue. It seems that vellum is calculating the particle point for every frame and I need it to calculate only the newer emitted (birthed) points... Is there a way to tell it to do so or is there a cleaner setup to achieve what I want? Attached is a simple test scene of where I'm at. Any help, guidance, or advice would be greatly appreciated! vellumParticleTest01.hiplc THANKS
  3. I am wondering if there is a way to convert an RBD sim back to a mesh?
  4. I'm trying to create an animation of a ship rising out of the water and simulate the water on it. But the animation is so fast that sails and thin ropes are not recognized as collisions. Perhaps raising the substep is a good idea, but is there any other way? Ideally, the collision should be as clean as this
  5. I am trying to get donut sprinkle fx. like someone is dropping sprinkles to the donut for toppings. but i am not able to get it right. attached hip file is a basic POP sim setup, part i need help is when the particle stick to the geo/collider/donut the sprinkles are standing up. what i want is to randomly placed or stick on the geo. like the pic. POP_Sprinkle_Odforce1.hiplc
  6. Hey all, I’m looking to receive some advice on a simulation I’m working on. My aim is to set up two fluid simulations following their own curve which leads to them both colliding and mixing together. What would be the best approach? Hope this makes sense! Thanks I’m advance.
  7. 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
  8. Mulitple Pop source emitters

    i have around 100 points that are emitting particles. each source point in SOPs has an attribute i would like to use in DOPs to activate or deactivate the birth of particles. i cant use it directly in impulse activation unfortunately How can i do this?
  9. Rbd objects emit particles

    i have some cubes that fall to the ground. I am trying to emit particles at the same time from the front side of each cube creating noodles that collide with the cubes. i thought the multisolver might come in handy but its not working so far. First time i am using it. Essentially i am trying to replicate grain emitted noodles on cgwiki https://www.tokeru.com/cgwiki/index.php?title=HoudiniDops#Grain_emitted_noodles but my source is an rbd object. i am not sure if this is possible. test.hip
  10. help,,rbd force not working

    I've looked through a lot of tutorials. It won't solve I want force to affect 5 frames and run on 44 And more constraint is lost than is desired force.hip force.hip
  11. Upres viscous fluid sim

    i a doing a simple simulation of a viscous fluid and each time i upres and wait to cache the result is always really different. First of all the general motion of the fluid changes and seems to be less viscous The other problem is that the surface when meshing later seems thiner. All i changed was the particle separation from 0.05 to 0.02. (of course this number is referenced to the flip object the fluid source and the final meshing) I am new to fluid sims and i was wondering if there is a way to guide the high res simulation and match the velocities of the low res. that way i can keep my low res result in terms of general motion but get much higher detail of my fluid.
  12. Volume source random activation

    Is possible to have my particles from the volume source activated at different frames? i am using a noise that i remap to frames to control which parts of my geo get activated when
  13. Pyro sim with moving emitter

    Hi all, I'm kinda new to houdini and i'm doing an animated pyro flame sim and when my emitter moves the fire doesn't follow the emitter, it looks like the emitter keeps working but the smoke and fire can't generate, i've attached photos so you can take a look, if you know how I can get this working i'll really appreciate a response. By the way my emitter is a torus, that's why the shape in suspension is a circle. Thanks!
  14. Fluids - help!

    Hi team! I have followed a good tutorial on Youtube as I was having issues with keeping fluid in a container, this tutorial also shows how to do bubbles in the water ( Tutorial here ) When the bubbles go through the water there is a loss of fluid and I have been playing around a lot trying to figure out how to prevent the loss, when the collision objects aren't connected there is no loss in the amount of fluid but when I connect the Collison object there is a loss of fluid and I cant figure out how to stop that. I was wondering if anyone else happened to know? Its just bothering me and I wanted to know the answer. Cheers! Hottub.hipnc
  15. Hello. This is my first time asking I think it's a long stretch because of the orange part, but I don't know how to solve it plz help me
  16. Houdini for Beginners - 005 - Vellum

  17. Maintaining Voxel Size in Sparse Pyro Sim

    I have a sparse sim in which several pyro events occur at different times & different places. As new elements are sourced into the sim, the overall bounds of the sim increase - sometimes dramatically changing the quality of the sim as the voxel size adjusts - see two back-to-back frames below. is there a way to maintain a consistent voxel size throughout the duration of the sim while using the sparse solver? Thanks, Luke
  18. Xgen fur to Houdini Sim

    Hello wizards. I need to simulate fur that was generated in Maya Interactive XGen (don't ask why), it has about 2 millions prims. I load it as guides (part of it, for test) and it simulates ok. So now I want to figure out what would be the best workflow to simulate the whole fur, as it seems to me it will be quite heavy to sim 2mil curves. I'm looking for optimization. Any suggestions would be highly appreciated.
  19. Hi, The problem is getting RBD Bullet pieces to floating properly: Icebreaker_fake_Buoyancy_Bullet_SpinningProblem.mp4 IceBreaker_Ship_PopForce_VexMask.mp4 im running into problem simulated flat sheets of ice being buoyant in a volume. I can get them to rise to the surface with PopFloatByVolume and also a fake popForce with vex using the pieces depth to mask the upward force. The problem is getting them to not spin around the packed bullet point per piece, and instead have proper per point of the mesh have force applied as per proper buoyancy would. So they lie flat once they get to the surface of the water volume! Struggling with the PopFloatByVolume spin settings, and PopSpinByVolume doesnt seem to play ball either. Im trying to go down the setPrimIntrinsic route, where i could blend slowly the rotation to be flatter as they get to near the surface, but im not hitting gold yet and would be great to know if theres a better route. any ideas or approaches would be amazingly appreciated. attached the hip file with where im at. IceBreaker_PopFloatVol_CustomVolumeInput_005.hiplc
  20. Membrane tearing

    Hi gang ! Here is my latest vellum file, I played around with noises and constraints. My goal was to emulate a membrane tearing, much like a burning film: You can download the hipfile and play around with it tearing_share.hip
  21. Hi there, I made a scene for simulating a piece of rope with the help of Vellum objects. Although it looks great, I noticed that when I use a polywire sop there is a lot of twist motion that makes the rope behavior unnatural. I posted the scene here so if anyone is kind enough to look at it and give me some suggestion for fixing the rope yaw rotation. thanks in advanced. RopeSimulation.hip
  22. Independent surface tension

    I am trying to achieve the effect of having a solid piece of geometry sitting as a fluid, being brought in by either volume source of pop source. This initial piece just has fluid ripples. The second part is I have emitters in the same dop network that are there to create a dripping effect. So it looks like this liquid that is holding shape is dripping. The problem is that I cant seem to create independent surface tension for the two separate sources. If I increase the surface tension to what I need then the main piece of geometry gets washed out. I have been looking for a solution to this but nothing comes up for Houdini 18
  23. How to fracture bricks for sim?

    Hey guys long time lurker first time poster. So I have a brick wall created in Houdini and I wanna blow it up. Got my texture projected and everything. The wall consists of several rectangular boxes all made in Houdini. Projection done in Maya. So now I wanna know the best way to fracture the bricks while still getting that interior detail on the "inside" faces of the bricks. Moreover, once fractured, how do I apply texture on the inside pieces? I know we gotta separate the inside and the outside groups first and then apply the material accordingly. However, when I apply the material (with a broken brick texture), on the inside group, it just renders a single flat color (the color dominant in the texture) . UV unwrapping the inside group and then applying a texture also doesn't work (renders out a single flat color). Maybe I'm doing something wrong Idk. So what is the best and most efficient way to fracture bricks and texture the inside groups? Would love it if you'll could share some tips to help me out. Thanks!! EDIT- I tried using Redshift. Thought that would be important to share.
  24. Fluid coupling

  25. pyro distributed problem

    is pyro distributed work with checkpoint ? i have 2 slice,output the .sim file with $SLICE variable work ,but when i try to resume the sim with this .sim file it will stuck. what i doing wrong?
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