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Found 149 results

  1. Help with explosion sim

    Anyone know what parameter(s) is causing all the smoke to quickly fall towards the end of the simulation? explosion.mov
  2. VELLUM PRESSURE

    Hi I'm trying to control the restscale attribute using a custom attribute, so i can animate a noise and have it inflate depending on the color / custom attribute. I have added a vellumconstraintproperty and tried to use vex to transfer my atribute. But this is where i'm getting stuck. any help would be amazing. thanks VELLUM_INFATE_TEST_04.hiplc VELLUM_INFATE_TEST_04.hiplc
  3. Hi i have a question regarding narrow band in fluid sims: I am using an ocean source for my flip tank as source but how do I calculate the layer size in oceansource (thought its particleseperation*gridscale*narrowbandwidth) - because my fluid keeps dropping down when sim is running
  4. sliced ribbon cloth effect .

    Hi , is there any guide or starting point to achieve this kind of effect in houdini like this tyflow example ? https://www.instagram.com/p/Bm8nHNfApwE/?utm_source=ig_web_copy_link the confusing part for me not the sim itself , it's how he slice the geo in a continues sliced way ? any input is really appreciated ?
  5. Colored smoke gasupres with Redshift

    I'm working on a colored smoke sim in H18 and Redshift and I have problems setting up my color grids properly. Running VDB diagnostics tells my values in the range are invalid and my knowledge of how to find the error ends there. The idea with the sim is to create a low res sim, up res it, and add colors from the Cd attribute. Does someone know how to set up this sim properly? blueGreen010.hiplc
  6. Hey there! I'm quite new in Houdini. I do not really like to ask questions, I rather tend to find answers by myself. But sometimes I hit the wall. This is the case I need your help guys. Im trying to make RBD sim in DOP NET with the simple spheres. My goal is to have variable scale and color of a sphere according to the noise. I manage to get color with POINT VOP in SOP SOLVER with MULTI SOLVER. But I stuck with the scale of a spheres. They inherit pscale from a GEO level. I would like to use pscale in DOP NET and manipulate it with the POINT VOP. Any ideas how to achieve it? I tried to make it with the particles, like in this tutorial https://www.youtube.com/watch?v=qXoSEnh94YQ&t=246s But particles tend to move erratically and not act like proper RBD. Balls on plane.hipnc
  7. Attach Camera to Boat

    Hey All - I have an ocean in Houdini with a boat floating on it. I'd like to attach a camera to the mast, but can't figure out how to do it. Any ideas? Thanks!
  8. Smoke collison

    How do I set up 2 different emitters shooting smoke at each other and colliding?
  9. Hi guys, I have a rigid body sim with constraint network, I want to access the previous frame and current frame data of the constraints (impact, forces etc) inside a sop solver in DOPs. Currently when I call the attribute in a wrangle from the relationship geometry node I don't know if it's current frame data or previous frame. How to get both the current and previous frame data in a wrangle in sop solver in dops?
  10. Hello again Guys. So recentrly (3 hours ago) I swapped to RS because my Mantra render was taking over 2 hours per frame. I started shading everything and had some problems with the volumes (Which worked in mantra perfectly fine) Scene View IPR with an area RS light with contribution set to .5 (to test) The setup As always, Thank you guys
  11. I have a scene where I am dropping a bottle into a flip tank all at small scale. The issue im having is that I am getting a quite a large space/void between the bottle and the liquid. Im trying to reduce this and make the liquid hug the bottle more in the beginning and not blow outwards and make this gap. The setup is an RDB of the bottle falling using gravity from around 10cm into the tank, both the RDB and Flip have been slowed down to 0.025 in time scale. I tried a number of things like lowering the velocity scale, upping the subframes from 10 to 30 in the RDB and upping the subframes in the DOP network to 4/5, and changing the surface tension and viscosity, but it still happens. There is no problem with the collision guide and I dont have any sort of surface offset on that either, it matches the bottle perfectly. You can see in the attached screen grabs that the bottle has barely entered the fluid surface but has created a large void underneath it blowing out the liquid. This is the sort of splash im aiming for: https://www.youtube.com/watch?v=npAuLi1y5AA Dramatic but close and not blowing out internally too much. I know my bottle is a different shape to that reference but my sim seems way off and I cant seem to figure out how to lessen that gap. Any suggestions I would be very welcome as nothing I seem to try is making the gap any smaller. Thanks!
  12. Hi, I've scattered 5 explosions to points using a switch node and a foreach loop. The explosion are randomly assigned to point but I need to have them offset at random as well. How would I go about achieving this? The effect I'm going for is flak in a WW1 scene but at the moment all the explosions start at the same time
  13. Pyro sim steppy look

    Hello again guys. So I am trying to do a pyro sim for some pod doors (Some fbx I downloaded) but I find myself with that problem. It is not the first time it happend, It might have something to do with the scale but I dont know. Can you guys take a look? Houdini.rar
  14. Hello, this may seem odd for majority of you who live in a country with constant electricity. I am making a rigid simulation of say 700 frames. I have already cached it up to 400 frames before our power supply got cut off and my pc went flat. Now, if power is restored and I change the frame range on the file cache node to 401 - 700, and then click save to disk. The dop network would start from frame one until it gets to 400 and then start caching. My question is this, how do I tell the dop net to start from frame 400 using the last positions of all rigid pieces already cached as the start point ?? Thanks
  15. Transfer Low to high sim - vellum

    Hello, i have a vellum source emitting a low res model every 10 frames. How can i exchange the low res output with the high res version? this is my setup, i am working on Houdini 17
  16. Pyro Sim not rendering properly

    So i got some help from a guy on here for my uni project. The file he gave me looks amazing but when i come to render it, the fire doesnt show at all. Does anyone know how to resolve this?PyroSim.zip
  17. Pyro Sim

    So im working on a pyro sim that is on 6 bowling pins with a juggling animation on them. For some reason the fire isnt really showing up at all on the pins and i cant figure out how to fix it. I would appreciate any help. PyroSim.zip
  18. Helloooo just trying to make it so my hair doesn't have to fall into place every time i start the sim. Thanks!
  19. Uni Project Pyro Sim

    So for my uni project i need to put fire on some bowling pins while they are being juggled. Im struggling to get the fire to flow correctly as if its being thrown. Ill link my files so people can take a look. Ive messed around with all the setting and i cant seem to tone down the fire. The screenshot i posted on this post has the fire being really blown up even tho all the settings are quite low. I would appreciate any help. Pyro Sim.zip
  20. Hi people, I'm wanting to drop and object as an RBD sim, but have it finish in a specific xyz position and orientation. Basically, I want to drop a bunch of letters and have them form a word. At the moment, they land as I expected they would, but I was wondering if I could 'nudge' them to land in the right place? The realism of the sim isn't too important, but it would be difficult to get the feeling of them falling, if I tried to animate the letters by hand from start to finish. Can I cache the sim and add a value to it, over time, so it ends where I want it to? Can I run the sim and add to the XYZ co-ords as it's running? I could, of course, sim it in Maya or 3ds Max... convert it to keyframes... blend in a final rest pose... and import the Alembic, but I wanted to know if I could do the whole thing in Houdini before reverting to a method I actually know? Thanks
  21. RBD to Vellum

    Hi! Houdini beginner here. I'm trying to make a bookshelf / pages explode. I set up RBD sim, which works fine. But as soon as I attach the vellum solver to sim it after the dop import, the papers just fall to the ground, no RBD sim info. I've tried putting the vellum constraints, pack it before the RBD sim, RBD, DOP import, unpack, and vellum solver afterwards. And vice versa, I've tried vellum solver before putting it into RBD, but so far no luck. How can I fix this or is there a better approach to this? (book_question_forum.hipnc) Thank you so much!
  22. Hello people I am fairly new to houdini, and I am trying to set up a crowd sim with ragdoll effect. I have prepared everything according to tutorials I have see online, and keep getting error messages in regards to the constraints. here are some screenshots:
  23. So I am currently working on an earth destruction sequenz were I have 2 layers on top of the earth base which I fractured and is going to collide with an object. I am a little uncertain on how I should go about getting the other two layer to follow the rbd SIM without having to sim everything 3 times. Just a hint or an idea into the right direction would be enough for me. Cheers, Pascal X
  24. CG Master Academy is searching for active industry professionals using Houdini for cloth simulation to develop and teach an online course. Flexible scheduling with a 3-5 hour per week schedule footprint depending on class size. Minimum Requirements: must have 4-7 years of professional experience in feature film/animation projects and a current demo reel showcasing work specifically in procedural modeling. Preferable: Some experience teaching or training artists would be helpful in this role. Please send resume/work history, as well as a link to your website and/or demo reel, to jobs@cgmasteracademy.com.
  25. Hello! I'm doing a school project, and I have to create something like a slime mesh. The main problem I have, is that I get a lot of flickering when I try to mesh the vellum grain using the particle fluid surface node. The same thing happens when I'm trying to mesh flip particles. Does anyone know how to get rid of this flickering? I've been searching a lot but can't find an answer. Thanks!! StickyFluid.mp4 bloodRND.mp4
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