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Found 197 results

  1. I am trying to do a sort of Sci-Fi explosion, still deciding on the story behind it, but I know the look I am going for. I want to have an energy core going critical with energy masses spinning around it as if following magnetic field lines. I finally got my field lines working right and got them into a vel field, but now I can't figure out how to cause it to animate the particles. I plan to generally control the animation from this velocity field, so it is really important that I actually get it working. Any suggestions? I have attached the R&D file I am working with so you can see where I am with all of it. particleTest1.hip
  2. Smoke & Mirrors ... a NYC post house needs an artist capable of create a macro demo with a biomedical feel. Should be comfortable with Flip/SPH Fluid, Particles, Pyro as well as procedural animation and deformations. This project is self contained so working remotely is a possibility. If you are interested you may contact me directly here for more info using PM here. Thanks
  3. Particle PROBS

    So ive been working on a particle disintegration for a couple days now and I just ran into a huge issue! My teacher said it looks like its produces sprite cards instead of particles! anyone have a way to make it work as needed? need simple particles instead of sprite cards! PLEASE HELP!!!
  4. Retime slow motion points

    Hello all, I have a sand set up based on points being advected by vdb vel. The results come out nice enough but the motion is too fast. I need the speed sim/solver speed to remain the same though to retain the kind of details I'm getting so I can't just multiply the fps down in the solver to cheap a slow-mo effect. What I'm looking for is to simply retime the points post-cache and make my cache slow-mo, which actually works using a timewarp (I just stretched the output range an extra few hundred frames) -- The slo mo effect is achieved but there is obvious stepping in between frames where the cache will freeze and play ever other frame (due to the stretching) To avoid this kind of stepping I tried using a timeblendql, which seems to have almost worked but because my points are dying and being deleted based on age, the timewarp breaks. Timewarpql has a neat feature where you can use the v of the point to blend between subframes, but since I'm inheriting my point v from the vdb vel its not as accurate is if you were using a trail sop, and again the trail sop breaks in my scenario because of the points being deleted perhaps based on age.. I can smooth the points together in post with nuke using a frameblend and you don't see the stepping... But i'm sure there is a proper and procedural way to interpolate between the substep frames of the point between A + B... just not sure how to go about this and I am having trouble finding a reference on the net. It would also be nice to have this setup on hands in the future. Thanks for all your time!
  5. Hello, I was wondering if anyone had any suggestions as to why my flip fluid sim seems to "compress" as my container moves. Any help would be appreciated. Thanks!
  6. Birth particles on a shadow

    Hi im having trouble to determine a way to birth particles (constant, 1 frame alive) only in the shadow of an illuminated object, the light moves in every frame.. any ideas?
  7. Hey all: I have a particle simulation with particles shooting outward from the origin. I am using the particle replicate to emit particles from particles. Here is the problem, I want the particles close together at the top but further away toward the bottom like the photos shown below. My Idea was to do a point jitter based of the age of the particle, so that new particles will have no jitter while old particles will have jitter. Would it be possible to accomplish that using vex in an attribute wrangle? Or could it been done in a point VOP with a slider to adjust jitter by age? Or is there a better way to have the older particles move out further outward? than using point jitter? explosion001.hipnc
  8. I'm currently following along with Rohan Dalvi's Motion Graphics tutorial, and I've run into two issues with the particles from the outer ring that I thought would have simple solutions, but so far have completely stumped me. The first thing I've found is that each point would spawn two particles, resulting in two lines very close together, and I want to get only one particle/line for each spawn. I've figured out the reason for this happen is that in my POP network I do two separate replicates, each on a different particle stream/group (so that I can have differing life lengths), and the replicate POP passes through the original particles (even those no being replicated) so after merging the replicates back together, I end up with two separate sets of the original spawner particles. Now the solution I came up with was to remove the points I didn't want to replicate, do the replicate for each group, then merge them back together (exactly like I would if I had this issue in SOPs). Problem is though that didn't work at all. I tried both Kill POPs and POP Wrangles, and a few different setups but nothing worked. I've included some notes with the scene file to give better explanations. Secondly, when the spawner particle collides with the tube, the replicator keeps replicating it, so we end up with a bunch of points stacked on top of each other, which I don't want. My idea to fix was to have a node placed straight after the replicate that removes any particles in the "hitparticle" group from the "stream_General_Spawner" group. That way, on the next frame, all the collided particles won't be replicate again. But this didn't entirely work either. "Combine Groups" on the Group POP almost did the trick, but in addition to removing the particles from the spawner group, it also removed them from the hitparticle group, which I don't want because I have a wrangle that does stuff with that group. Does anyone know why these issues exist? I'm guess that I'm missing some sort of foundational knowledge on how POPs work? Any recommendations for tutorials or articles to go along with the documentation to help with this? POPs_problem.hipnc
  9. Hi all, I want to import a particle simulation from houdini to Maya without using the Houdini engine and render in Redshift. I made a way around it stamping spheres into particles and exporting them as Alembic, but the file is too damn heavy. Do you have any suggestion? Thanks in advance.
  10. hey guys so this one is thumping my head i have a popnet with some grains... its working well. now i want to simply cache out this simulation to disk, then bring it to another hou file. But what is the best way to go about that? I'm just lost here. i can cache it out a .bgeo sequence and then fetch it in with file read node into a blank hou scene but the grains have lost their spherical look and the ramp colour too ? I cant for the life of me suss out how to plug this into a new popnet scene anyone with any advice much appreciated losing my head here ant
  11. POPsolver not working

    I'm trying to source particle emitters from geometry that i created in a scene. Unfortunately, there seems to be an issue with the popsolver node, it's saying that: 'Connection 2 input is the wrong type' I'm trying to create a whisp effect, following some tutorials but already stuck and not able to continue. Please help! WhispIssue.hipnc
  12. Hello, problem how can I use the imported vertex color of cached particles in Houdini with a cloner in Cinema 4D? Story I simulated and cached simple particles in Houdini and imported in Cinema4D by alembic format. They have colors according some rules created in Houdini, in the end, it's just plain Cd. If I select particle when importing, I see no particles in viewport, so I switched to polygons. When I use a cloner to clone a sphere for every vertex, I expect the sphere to have the same color of vertex, like you normally have with a copy node, instead the sphere has no color if not the one of the shader. I know, I already asked in an other forum about this problem more about Cinema 4D than Houdini, with no success, it seems to me it's not straightforward like in Houdini, of course, with all the respect to Cinema 4D, fantastic program, and its community, but I was wondering if someone had the same problem and found a solution. Thank you in advance.
  13. Hey all I am working on a shot that needs ink to morph into a Heart then into a Ship. I have the base of the effect , although my last morph is a little quick,need to figure out how to slow the ship morph down a bit. But my main issue is my particle advection isn't working correctly. The particles are inheriting velocities but they are not following the smoke sim correctly. They don't form the desired shape even though the pyro sim is. I have a scene attached if anyone could help it would be appreciated. Kraken_MAIN_Ink_Effect_09.hip Ship_Mod_v01.obj Heart_Mod_v01.obj
  14. I think this is prolly an easy answer and I know I should know this. I have a pop net and I have to points enter a group based on the age, and once they are in that group a pop force takes over. but as of now they kinda pop as soon as that force takes over. is there a way to ramp into that group rather than it being an on or off so there is a smooth transaction into the pop force. Thanks for your suggestions in advance!! Rob
  15. Seven Dancing Swirling Blobs

    This is an enhanced version of an earlier animation. This time it was rendered with a dual 1080GTX G1 and 960GTX in Redshift. So instead of taking 3 hours, it took about 1hr30 - I guess there are ways of making it quicker but I'm still in the learning process
  16. Forming object

    Does anyone has an idea of how to do something like this but at the inverse? https://www.youtube.com/watch?v=zrhXB653wKg Any idea would be awesome!
  17. Hey everyone, Im trying to do a simple disintegration but am running into an issue with a crossed boundary error in the Boolean SOP. On those frames (17, 21) it seems to cause the particles to pop and I am not sure how or really why I am getting the error. I attached a couple pics to show you what is happening as well as my node tree so far. Any help would be much appreciated?
  18. Hello there, I am learning Houdini and I tried to apply the GeoBoil setup to a dancing humanoid. I am struggling to understand how to use attributes to constrain particles to their birth position on the moving mesh. I have read plenty of related topics, but I honestly can't come close to any solution. I tried freezing the mesh with time-shift, scattering points, using scattered points to generate particles in the POPnet and then restoring the animation, but of course the particles remain in the position they were generated and do not stick to the surface. I attached the basic setup file and the .abc I used. Thanks in advance! boil.hip
  19. Hey, Let's say I have footage of an actor that is rotoscoped in either nuke or after effects. I need to emit particles only where the rotocoped actor is and also the particles need to have the color based off the footage. Where do I start? Thanks
  20. pop gravity node

    Hi, I made a deformed wave and I turned a patch of it into flip object. I wanted the patch of flip to move with the deformed wave mesh, so I bypassed the gravity node. I then have a geometry colliding the patch of flip particles but the problem I have now is that, because I already made it zero gravity on the patch, the sprays formed from the collision is now floating in air. I wanted the spray and foam to be influenced by gravity so they fall back to the ground but at the same time I want my patch of flip to move along the deformed wave mesh. Does anyone have any suggestions on how to achieve this? Thanks
  21. Custom Normal Rotation

    I have a popnet creating some particles with the POP spin, to have a random rotation in each particle, also Im copying a tube in each particle, the tube rotates as it supposed to, but when they hit the ground, the tubes stays with a random rotation as well instead of pointing Y. I'm thinking that if I use the normals instead of the POP spin I could blend between the N0 and N1 when the particle hit the ground, using the hit info from the POPnet, but truthfully I don't know how to achieve this .-. I'm using POPs and copy the tubes/coins to the particles because the particles born magicaly from the floor after a character hit the floor with his cane. If anyone could help me or have any idea I would appreciate it!!!
  22. I was testing to transfer particles from Houdini to Maya,i use Cortex plugin to go into Maya,since Maya default importer sucks like 3dsmax roadmap So i was triying to get rotations, so far i cant get to work. Anyone tried this? Thanks
  23. Hi, what I want to do, as the title says, is to emit particles from an animated 2d texture. So far what i have acomplished, is to emit particles from a standard, non animated 2d texture, but i cant get it to be animated, i leave the files i have been working on, im sure is just a stupid thing that i have to turn on, but i cant find it.Also if there is an easier way, or anothert way you may think i could acomplish the same effect just say it.Thanks in advanced. test_animated texture.rar
  24. Hi there,I'm trying to change the colour of a primitive once a particle collides with it….but i don't want to use an attribute transfer because that gives me a gradient of colour on the primitive and i want to change the colour back after it's been hit and have it be a solid colour. So hit == green (0,1,0)not hit == red(1,0,0)Another problem i'm having is when i don't use an attribute transfer and write it in a python sop(code below) i change all the primitives colours in one go rather than individually where the the particle collides with each primitive.Not sure how to go about this, but here is the file attached.Any help would be much appreciated.CODE FOR HIT COUNTER AND PRIMITIVE CHANGE COLOUR node = hou.pwd() geo = node.geometry() from hou.session import * inputs = node.inputs() # bring in city searcher data pointcolliders = inputs.geometry().points() ship = geo.prims() if hou.frame() == 1: hitCount = 0 for p in pointcolliders: store = p.attribValue(“hittotal”) # get hittotal attribute from the pop solver hitCount += store # hitcount += store (to add number of hits to hou.session) hits = store green = (0.0,1.0,0.0) red = (1.0,0.0,0.0) #change colour of second input so object for s in ship: if hits == 1: s.setAttribValue('Cd', green) else: s.setAttribValue('Cd', red) particles hit each prim.hipnc
  25. Basically, I'm creating a scatter points in a surface and I plug a POP Network, so I want that the Pop Network import those scatter points as particles, but I don't know how to do that. Can some help me to do it?. So I want to put the scatter points and use it as particles.
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