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  1. I'm trying to replicate this effect to learn. I've attached the ref and my flipbook. Feels like I'm close from a setup perspective? Wondering what I could do differently so it feels more sandy. I'm using a flip sim advected by a AA Flow Noise Velocity field. Somehow I don't get the same "sandy" look. Any ideas how to get closer? sand-flip.mov sand-ref.mp4
  2. Hello Friends, I have a Problem. I build a particlefluid with a normal flip fluid solver. A Object falls with a transform-node in the fluid and the fluid splashes. But when I add the retime node at the end, my mesh from the ParticleFluidSurface disorted between a few frames. Here is a video. Has everyone a solution for this? I tried some settings but the problem remains. Greets Patrick untitled1.mp4
  3. Just interesting Topic.. wondering For approaches !!!?? Short sims?
  4. I have tried a lot and i just cant understand why my particles are dying and volume is reducing. I am trying to make a washing machine animation with the water. Any tips? Any suggestions would be appreciated :)) untitled.avi washing_machine.hip
  5. Is there an existing workflow to run a pop sim on the gpu?
  6. Hi all! I have a sim that does both, FLIP and RBD. All works fine so far, but I am struggling with caching it in an efficient way. I am using two separate DOP import streams to fetch the FLIP and the RBD and caching them out. As the sim is too high res to fit in memory that means that after e.g. caching out the FLIP I have to run the whole simulation again to cache out the RBD! There must be a better way... Any input appreciated!
  7. Hello guys. Recently i have run into strange issue. I have my packed objects, that have some orient on it. I need to feed them into the Bullet sim, problem is that if i have orient as attribute on the packed objects, my sim explodes on first frame (no intersecting geo), if i remove my orient, sim behaves as expected. so i have run my sim without the orient coming to bullet (renamed orient to keep_orient) and i thought i will just substranct+add them at the end to get correct orient values for my instancing i do as next step. Problem i have is that i was not able to get correct orient from it. Would someone able to explain me what would be necessary to do to make it work, or why bullet explodes with orient values? sorry i cant share any scene at this point. my whole setup is: points in the space, that have @pscale and @orient (random nodes), that goes into the grain sim, to make sure i have no intersections, then i do copy bunch of rocks onto those points which goes as packed geo into the bullet sim.
  8. 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.
  9. 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
  10. Hi, Anyone knows a good way to deform groom using sim curves? as guidegroom deform doesn`t seem to work for me and pointdeform has some other issues. Do I really have to sim low res curves and then apply hairgen for full res? Problem is that i have my groom done already and want to sim approx 10% of curves and only the long ones and deform my groom by those curves. Obviously I can`t acces Furtility, so is there any other good way using Houdini to do it? Thanks Here is the simple example of what I`m talking about: groomDeform.hip
  11. I am wondering if there is a way to convert an RBD sim back to a mesh?
  12. Hello, I have a really heavy flip sim of a river (around 101 millions of particles), I'm working on my final project for my master's degree. At my uni I can use only during the night as much computers as I want, each of them with 64gb ram. Since it's not possible to use the renderfarm for caches,I obviously thought to use more computers and render on each of them a specific frame range (470 frames total). The problem is that everytime a computer will start to cache, Houdini will always start to calculate the sim from the frame 1 and it will take the same huge amount of time, so what's the point to use more computers? Am I wrong? What kind of procedure would you use? p.s. keep in mind I cannot leave the computer caching after the night.
  13. Hi Everyone, I'm trying to setup a TOPs network to cache out sims with multiple parameters being sent to the dop network. Seemingly basic stuff, however nothing I'm doing seems to be working how I think it's going to work. What I've tried: Using a wedge node to set a random attribute and trying to use that attribute in an exterior dop network - caches into a view able geo rop output but all the wedges were the same Rebuilding the pyro sim purely in the tops network - it makes something but when viewed all the frames appear empty Have the source inside the tops and the dop outside - same result as the first
  14. 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
  15. 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.
  16. 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?
  17. 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
  18. 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
  19. 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
  20. 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.
  21. 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
  22. 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!
  23. 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
  24. 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
  25. 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
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