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Found 251 results

  1. Hello, I'm trying to distribute my wave layer tank FLIP to about 8 computers and they seem to cause this(seem image below) when they are brought back in where the sections that meet go crazy. (i'll add a file when I get a chance if the image does'nt instantly spark an obvious solution.)
  2. Hi guys i'm sure there is a really simple answer to this but I as wondering what was the best way to render out Whitewater? I've tried the method that Houdini sets up by default and it comes out looking far more like fog than what i'd consider foam. I've tried rendering them as particles but to get the density that looks good it uses up way too much RAM (only have 24 GB). Meshing them with a particle fluid surface node also look laughably silly.
  3. Hey guys, I'm trying to use HQueue for flip simulation. I believe I set up the machines correctly as the HQueue server distributes render jobs successfully. And the jobs are done well. The problem I have is distributing simulation. I followed the direction from the HQueue help. Nothing special. However, the working stops all of a sudden in a certain frame. Actually, I tested both volume slice and particle slice for different kind of fluid solutions. And the same problem comes out around 10 frame. No more proceeding. But the render manager shows "running" that means the HQueue is working fine. I guess this is definitely an error in spite of no error messages because HQueue stops anyway. There's no clue. I'm totally stuck on this point. These pics are from a sliced pyro sim but actually a sliced flip sim has the same problem. Anybody has experienced this problem? Or give me a hint for solving this problem. This actually drives me nuts. OS: windows 7 professional x64 SP1 HOUDINI: 14.0.201.13 the server and clients are all same. hq_flip_02.hip
  4. Hello fellow artists! I'm currently working on a commercial and they asked me to create some sort of dissipation effect on a dancer's skirt. I was able to create the dissipation effect, but I'm struggling in how to get the texture of the of the cloth after meshing the particles. I was trying to get it done with the zero gravity tutorial found here but with not that much luck. I can't share the scene files I'm working on but I made a quick one with basic settings and tests. untitled.hip
  5. I am creating a long animation of a boat on an ocean surface. I am using the new guided ocean surface with Houdini 16 to make use of the extended fluid surface blending to an infinite ocean. I am encountering a couple of problems, one being that as the sim continues the boat becomes a submarine due to so much fluid, but also, relating to the topic of this post, white water emission is occurring everywhere making blending into the ocean a problem. The question is, how to I use the volume mask created by the particle fluid mask node to reduce the velocity, curvature, and vorticity of the compressed fluid sim so that the white water emission will blend better with the infinite ocean? Any insight would be very welcome. Thanks
  6. hey, I want some curl noise to affect my flip particles which works. I also want only the actual vel streams to affect the sim. Unfortunately everywhere the volume box is present flip gets affected. An easy solution for this? Only happens when I add noise to the vel field. untitled.hip
  7. Hi everyone! I am completely new to Houdini and have a few questions about Ocean and FLIP. In the attachment you can see a simple “boat” with a FLIP (Guided Ocean Layer) connected to it, combined with a “Small ocean surface” from the shelf. 1. How would I go about blending the FLIP and the Ocean ? 2. The default shader for the FLIP-sim does not seem to have any “foam” on the top of waves/crest like the “surface” does. Adding Whitewater does create “foam” spray around the “boat”, but how would I go about getting foam on the wave-tops/crest of the FLIP-sim ? Thank you in advance !
  8. Hi guys, Having a bit of an issue having two forces affecting one flip fluid system. What I was trying to do was have a waterfall run off the end of a cliff. Setting this up was fine, however, I found that the fluid doesn't seem to break up very much once it has ran over the edge. So what I am trying to do now is run the fluid through a mask field which has a wind force acting within it, the theory being that i can add turbulence to the wind to break up the particles more. What I have found though, is that no matter what order I run the fluid through the forces, when it hits the mask field it almost completely halts the current velocity and takes on the velocity of the wind force and ignores the gravity until it is out of the mask. I'd be really grateful for any help on setting this up so that the fluid continues to fall whilst passing through the wind area? Or if there is a better way of setting up this kind of effect? I'm pretty new to houdini so it could be something really obvious I'm missing. Thanks in advance
  9. hey, I'm trying to build a little vector field to advect some flip particles. so far so good. unfortunately the particles are staying around the field insteat of just getting shoot in the right direction. I can shoot them with a vel of 100 but they suddenly stop vel.hip
  10. Hi, (Disclaimer, still pretty new to houdini) I have a flip simulation that's intended to be a bowl of milk. I want the bowl to be full and to just settle until it's affected by outside forces, but the fluid just instantly collapses to a fraction of it's overall size, even with gravity off it just compresses in on itself. I've tried reading up on this problem online, and have tried various solutions such as disabling reseeding and enabling separation, increasing and decreasing the particle separation and grid scale, but nothing seems to work. Would someone mind looking at my file and telling me what i'm doing wrong? It's driving me up the wall and it's preventing me from completing class projects. Thanks, Richard Advert.zip
  11. Hi guys, I'm started on a H16 sim where I have a cup of ice and fluid and another piece of ice that will dive in and float back up (animated). I've almost always dealt with larger water sims and don't have much Houdini experience with small scale sims I figured some people here have experience with such simulations and would like to ask if there are any best practices and tips here? I have some questions myself 1. How important is it to try to simulate and keep everything to scale for rbd and flip sims of this sort? I have found in my initial bullet tests that just trying to fill the glass with ice at scale tends to give me exploding rbd sims. In this case, I had the ice cubes and glass modeled in maya. When I brought it into Houdini I scaled it down by 100x to match the meter scale in Houdini. I tried adjusting the collision padding to stabilize the sim but to no avail. I had no issues when I worked at 100x scale. I'm curious if anyone else has experienced this? However, not working to scale meant that my flip sims feel larger in scale, like a swimming pool and not a cup. Increasing gravity 3x has helped the sim look more to scale. But that seems very arbitrary to me. I'm more inclined to work at a bigger scale as adjusting to smaller scales have given me all kinds of problems from unstable rbd sims to leaking water particles and decreasing water levels. 2. Is flip the the recommended approach for these fluid sims? I've seen sph being recommended. But honestly, I don't even know where the sph tools are 'hidden' these days in Houdini. And I know these days SideFX recommends flip for everything. 3. What is the best way to get some of the ice to interact with the water sim? Via density and flip solver feedback or the bouyancy force dop node? 4. Any tips on dealing with collisions and keeping things water tight in a thin lip glass that still needs water to splash out of the glass? When testing, I often found that it was very easy to leak fluid from the container even though my flip collision guide shows that there isn't any holes in glass collision. 5. Any tips in meshing the fluid with regards to lighting and rendering? I've seen it recommended that the water geometry be slightly larger then the glass. How are folks doing that with flip sims? I'll try posting an example file whenever I get to a good point. I really would like to benefit from the experience of folks who have done this sort of sim. Thanks in advance.
  12. Hey, I don't know whether this is a bug or not but I can't use two merged ocean spectra with point instancing on them to deform the guided ocean layer. Thats strange because I can object merge this merged spectra and deform a grid. Why is this happening? I want a large ocean to get merged with a flip sim. Not wanting to use the new edge extension system but it would be helpful to have the same spectra be applied on the flip particles as well as on the grid.
  13. Hey everyone!I've been messing around with the new guided ocean layer approach in Houdini 16, but came to realize my simulation goes haywire when I lower the particle separation. Everything seems to be respected at a particle count of 740,000, but when I simulate 3,000,000 points the velocities go crazy and I get patches where particles disappear.I attached both flip-books to show what I'm talking about.Both files have the same parameters just a different particle separation. hi_res_sim.mp4 lo_res_sim.mp4
  14. Hey guys, I'm working on this snot simulation and I need the top part of it to be "attached" to a nose. Any ideas on how to proceed? EDIT: Right now it's like this but I need to "constraint" it to a character. Thank's Alvaro Snot - v1-a.hipnc
  15. how would we setup fem flip interaction flip pushing around fem body? Fluid force? Does feedback needs to be enabled on flip solver? Looks very buggy this in h15.5 .565? If I increase fluid force it is pushing flip upwards? Anyone have experience with this I want to get something like this going on http://physbam.stanford.edu/~fedkiw/animations/starfish_150.mp4 starfish_v001.hipnc
  16. Hey, I do have a little problem with flip collisions. I'm simulating a layer of caramel on top of which I want to add a layer of chocolate. The mesh of the first layer I converted to a deforming object. Collision volume and everything looks just fine. Unfortunately flip is going crazy when it touches this surface.
  17. Hey guys ! I followed through Ben's tutorial on the gorgeous melting angel flip simulation. I'm trying to achieve this effect on a personnal project, with a Rubik's Cube. The only way I found to keep colors on my cube's faces is to have UV's and texture on it. I googled my problem and I found many topics similar as mine. Like Toadstorm topic's on his blog, like rurik topic's on ODForce. So I tried many solutions but I can not get a satisfying result. Could you guys help me to figure what's wrong ? I attach my HIP file, sorry it's quit heavy :/ Thank you in advance for your answer, Gael. RubiksCube_v01.hip
  18. Hi there, I've got some strange problems with the collision volumes in flip. The static object itself shows a clean, closed volume; the flip object on the other hand shows me a mess. Nothing is closed, the collision volume seems to be made of stripes. How does this discrepancy between static object and flip object happen regarding collisions? Actually the flip particles are floating inside the object. Got a new ship model and obviously some diffuculties making it work I also tried to use for each loops to convert each single object the shi is made of into volumes in order to merge them together insteat of turning the whole thing into a volume at once.
  19. Hey everyone! It's been a while since the last time I posted here because I was a little off from doing FX, but now I'm back on learning and stomped on some difficulties trying to do some collisions, flip and RBD simulations. The problem is that everything goes fine until a certain frame and the next one everything is exploding. I'm not sure if I'm not feeding the proper collision to the simulation or if the external forces override the movement of the particles rather when collision with a geometry takes places. A brief description of what I want to do is to achieve somewhat this kind of effect: -Water being pulled updwards, colliding with an object and continue the fluid simulation motion from there I'm attaching the .hip, some screenshots and a reference for what I want to do. Thanks a lot for taking a look and if someone can point me in the right direction I will be very grateful. Cheers! kamigawa_v002.hip
  20. ice

    How to create this behavior in a simulation, without fungus. What would be spread flip simulation evenly with a residual slowdown. Like on video ice.hip
  21. Hey Guys , i have a fast moving flip source , and cant get smooth shape , it look like emitter shape while emitting , i tried many different solutions like , putting time blend sop,trail sop , increasing substeps but always get same result . i had this problem in realflow too , but i fixed that by incearesing min substeps , but it didnt work in houdini , is there any solution for fixing this problem in houdini ? thanks
  22. This is a small project i had been working on lately, mostly had to limit myself with the render settings as this almost took 1 hour per frame. any feed back would be appreciated. Thank you
  23. Hello,i have this wierd artifact only when use wave layer tank,any help?
  24. Hello guys, need your help, About week I fight whit this and without success... So, please look on example. This is a cheese cream. If you look closely at beginning falling cheese have a small viscosity value (create some splashes almost like a milk or similar) and after some time he become more viscous (create some almost static ripples). I was try to affect viscosity value with temperature value (like lava effect) and try some manipulations with age of particles but this is didn’t show proper result. I'm stuck..... Any suggestions and attached hou files will be most appreciated.
  25. Hello artists! I'm trying to create an airfield alike effect but for geometry. Kind of like this effect : vimeo link Im also using VDBs for collision How'd you guys tackle this? Cheers and good work!