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Found 5 results

  1. Hi guys, Here the pitch : Snowflakes are falling, all of a sudden, time stop, snowflakes are in mid air, they move just a tiny bit. Only a few characters can move in the scene. Those characters are moving in the middle of those mid air snowflakes, who are advected by the movement . My first thought was to animate the time scale of my pop sim, that way the particle seems to slowly stop, which is what i want, but with that setup collision and advection didn't work. My second thought was to multiply the velocity from 1 to 0.001 in a popvop, but same conclusion, it seems that without velocity my particles wont move after advection from a geo, (which make sence, the overall velocity is multiplied by 0.001 ) Do you have any ideas how i could slowly stop the movement of my particles and advect them without using the timescale ? Thank you for your time Kind regards , Las
  2. Hi there, First time trying to advect particle to my fluid source, however the particle seems to be pushed to certain direction. I have checked my velocity on my particle, dont seem to have any velocity pointing anywhere towards to where its going. Im pretty sure there are many other ways to advect it, this is the only way I come up with since I just started to use houdini, I have attached the file down below please sim a few frame of this pyro and to be able to check the particles. I have tried to name everything as clear as possible at the same time. Thank you guys in advance! particleAdvectionProblem.hip
  3. Hello, Not sure you ever stumbled on this work of mine but I wanted to post this anyway. This work didn't make it into the movie the way you see it in the video and although its been inspiring and helpful for other artists to accomplish the director vision it's pretty much remained a solely piece of home work And so I'm sharing a hip/bgeo file of what I did in my spare time before I took it further at work. With the hope there will be something useful in there for anybody here willing to give it a try. After all, sharing is caring! https://vimeo.com/106126363 Alessandro
  4. Hi all, I was wondering if anyone had given the vdb advect points a shot? I’m trying to move some points along an sdf and am not having much success either with Projection or Constrained Advection. I’ve attatched a .hip file, but in terms of results what I'm getting: Advection: Works fine Projection: Doesn’t appear to do anything Constrained Advection: Crashes Houdini Has anyone else had any luck with this node? I’m not sure whether it's just I’ve set it up wrong, or giving it the wrong input... Cheers, Julian vdb_advect_pt.hip
  5. Hi, I am having some problem creating sharp and thin smoke using wispy smoke.I am a new user and not very proficient at Houdini but I have been trying on my own, gathering information from the forum. In a nutshell, I am trying the effect of a woman emitting smoke from her body.For this I shot the model on green screen, extracted the key and used the trace and scatter sop in Houdini.I have set my simulation.Since I wanted fine smoke, with more details, sharpness and crispness, I searched for the 'how to' get that and came across the 'ink effect' technique using millions of particles. I advected my particles with simulation, however, I think I am missing something.It is not retaining the shape of my sim.My idea is to use the technique to add finer details. Could you kindly take a look at my hipnc file and tell me what am I doing wrong?Is it that smoke is too thick with too many scattered points or am I doing something wrong in the particle network?Or may be there is a way to achieve what I want without getting into particles? I have intentionally reduced the number of particles temporarily. * Also is there any way to control opacity of particles with the sim density? The files below include the hipnc file, a few frames of alpha keys to be loaded into the trace sops, and a few frames of advection test render.This for some reason didn't let me attach the zip file so I am using dropbox. https://dl.dropboxusercontent.com/u/42878955/wispysmoke_advection.zip Thank you for your help.