Jump to content

Search the Community

Showing results for tags 'Pop'.



More search options

  • Search By Tags

    Type tags separated by commas.
  • Search By Author

Content Type


Forums

  • General
    • Lounge/General chat
    • Education
    • Jobs
    • Marketplace
  • Houdini
    • General Houdini Questions
    • Effects
    • Modeling
    • Animation & Rigging
    • Lighting & Rendering
    • Compositing
    • Games
    • Tools (HDA's etc.)
  • Coders Corner
    • HDK : Houdini Development Kit
    • Scripting
    • Shaders
  • Art and Challenges
    • Finished Work
    • Work in Progress
    • VFX Challenge
    • Effects Challenge Archive
  • Systems and Other Applications
    • Other 3d Packages
    • Operating Systems
    • Hardware
    • Pipeline
  • od|force
    • Feedback, Suggestions, Bugs

Found 198 results

  1. Mulitple Pop source emitters

    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?
  2. Rbd objects emit particles

    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
  3. POP proximity to group

    Hi everyone! I have a very basic POP setup. The side with positive P.x belongs to group "right". With a "POP proximity" node I check nearest particle. My goal is to fins if particles from "left" have a nearest neighbour from group "right" and if they have color them red. In my opinion it should be simple. The nearest attribute gives you a number of a nearest point and you use it within "inpointgroup" to check if nearest belongs to this group. If it belongs color red the point that has a current nearest as its attribute.... But it doesn't work. I tried to put the same code in in a "geowrangle" but it wasn't working also there. (in general what's the difference between "popwrangle" and "geowrangle"???). I trief to solve the problem avoiding "inpointgroup" by assigning the attribute ntest to particles from the right and checking in popwrangle within "point(0,"ntest",npt)" if a nearest has the ntest attribute equal 1... but again things aren't working... Apparently "point" doesn't work that way in POPs or I use ot wrong... don't know..
  4. pop fluid along curve problems

    Hi all, I have pop fluid running along a curve. All great at the start but when it gets near the end of the curve, the fluid floats away, gets a little messy. Any advice on keeping the particles on the curve? hip file attached. waterSpiral.v011.hip flipbook_waterSpiral_v10_waterSpiral_v10.mov
  5. POP stream/group in wrangle

    Hi everyone. I have a pop stream called "stream_main" and is written that its a pointgroup. Though when I refer to it in a wrangle, if doesn't work. I don't know why.
  6. POP Force Mass Remap

    Hello Everyone I noticed that many parameters have a "Use VEXpressions" checkbox and i try to understand them. In my example i would like to remap the mass of the pieces by VEX. Preferably using a Ramp! And all that inside the local VEX of the POP Force :-) So that there is a better distribution of pieces in Y. I can't make it work... should it?
  7. In a pipeline that requires you to do VFX work in Houdini and then render said VFX in 3ds max, there are many formats that are viable (I mostly use alembic). But I was not lucky finding a straightforward method/format to export particle systems that were created in Houdini to be later replaced by geometry in 3ds max for rendering. After some tests, we managed to do it using an HDA called PRTRop which exports particles in .prt file format. The particles were then imported into 3ds max using TyFlow, that reads a couple attributes such as width (pscale), id - this one is necessary for tyflow to import the particles, velocity, etc... Then we hit another roadblock: what if I want to export particles with orientation information for my geometry instancing? It turns out that, after some more testing, we discovered Tyflow uses an attribute called Orientation (case sensitive) which is a quaternion just like Houdinis orient attribute, and it has to be exported as a float16. So in case some of you were wondering how to do this, I'm sharing the workflow used here. If some of you know a better way feel free to share it... it might save some lives! Cheers, Mozzo
  8. Object pop collision

    Hi I'm working on a test with arrows soothing on object, a very basic copy to point with particles Right after the arrows emit the object they are not falling not in a natural way they are "standing" attaching image and the scene, hoping for some help in this thank you Arrows_Test_01.hipnc
  9. Hi, I'm quiet new in this big world of Houdini, i need help. The project consists of creating spheres on the points extracted from a pop simulation and then destroying them. The problem I encounter is that when I put the glue on different spheres it seems that it creates the glue on all the broken pieces. It could be the fact that in the assemble node, it considers those points as a single geometry, but I don't know how to divide those points as unique entities and then apply the glue only on the individual spheres and not on all of them as a single object. Thank you in advance for your attention and any help. I attach the file below. Thanks a lot! Fra_pop_copysphere_and_rbd_.hipnc
  10. Hello everyone! I recently made a setup to achieve magical smoke effect that orbits while moving. I shaped and animated a bunch of points that move along a custom curve. I want to make all those points orbit or twist around the original path (curve), something similar to curve force node for POP. I'm having some difficulties making this happen with VEX. I would appreciate your help. Cheers; Basic Shape.hip
  11. POP wrangle number of inputs

    Is there any way to add more input slots in a POP Wrangle node? By default it has 4.
  12. POP particle collision/final resting

    OK... I think I've exhausted my button pushes and research. If anyone can give any pointers about getting my collisions/debris to actually appear to rest on the surface and/or interact with the moving model I would be very thankful. Currently, the `debris` appears to come to a final rest above the surface. I've included the scene and ref'd geo. quinniusMaximus_recog.zip
  13. Hi. During Rigid Body simulation. Is there a way to scale up particles at first, And then scale down and delete at last. kind regards. popdopchramp.hip
  14. Hi there, I'm trying to learn vex, but I've run into a bit of trouble with the RBD solver. My goal is to apply forces to individual points on a model, and have the model respond appropriately. My first assumption is that I would use a bulletRBD solver to accomplish this, along with a POPForce node. However, this applies force to the center of mass of the object, which is fine, but I also want some rotational values as well. For instance, if I have a cube, and I apply force (0, 10, 0) to verts on the left side of the cube, and I apply the opposite force (0, -10, 0) to verts on the right side of the cube, I would like to see the cube spin. I know I can manually edit the @w attribute to add angular velocity, but do I have to calculate the angular velocity manually to make this work? Thanks for your help.
  15. Deform Box of Points (cells)

    Hello friendly helpers, to make it short and maybe a bit more easy to understand what my question is - a few screenshots. I tried it self coded which works well with a grid. Deforming a box works fine with a ripple solver. When i put a box into the sin-wave wrangle - the box deforms completely to the x-achsis... I want to have a box of spheres, which behave like a sin wave over the whole box. The farest where i get my head is to have the spheres sitting on the x-achsis. But i need them as a box of spheres. It would also be nice if the spheres would collide between each other. I thought of doing this with vellum grains which worked actually pretty well, but in the end i got problems with forces. Is there any way to do this with vector force or velocity volumes? Or has my code the potential to fix it fast? ^^ Have a wonderful sunday btw
  16. POP Sourcing into specific DOP object

    Hello, I have two different DOP Objects (RBD Packed) and I want to source Geometry into just one of the objects, not both. I am using the popsource node which by default sources to both of my objects. (Using just one object is not an option for now) Any tips? Thanks!
  17. Rhythmic particle emission

    Hey everyone, this seems like a rather trivial thing, however, I'm a bit stuck. I'm currently working on an AA gun-asset to create tracer fire for a couple of night shots, but I'm having trouble getting the pop source to emit a constant stream of particles. It works if I set the emission to once every frame or once per substep, but for all other combinations of timings I tried, I get a stuttered particle stream with lumps and gaps. I must be missing something here. Surely there is a way to quantize the particle emission to be more regular? Thanks in advance! aa_asset_dev_v001.hip
  18. I'm having different results in my simulations using packed rbds connected only to a bullet solver vs when using a POP source to emit the rbd packed object into a popsolver/bulletsolver multisolver. The bulletsolver alone is giving me the expected results... I've seen some tutorials and tips by artists that recommend the multisolver approach, because it allows control of the RBD sim using pop forces and wrangles, and thats why I'm asking this. bullet_solver.mp4 rbd_multisolver.mp4
  19. Pre-solve Post-solve

    what are exactly the pre-solve and post-solve input of popsolver ? there isn't any explanation about these input in the documentation?
  20. [SOLVED] @P in Flip/POP Vexpression

    Hello everyone, I am currently working on something with FLIP Fluids and need to decrease the POP Windforce depending on the distance to a point. I assumed I could use the Vexpression inside the POP Wind but I can't seem to be able to access the particle Position. I have created a basic HIP file. Inside the AutoDOP Network, you will find the POP Wind in which I'm simply trying to export a test attribute that should be "@P". I've already tried a couple of things like Google, reading the float values separately ("@P.x"), or simply using it like I would use VEX in SOPS ("float length = length(@P);"). I am sure there is an easy way that I haven't found yet or a logical reason why I can't access "@P". Any help would be appreciated! Position_in_Vexpression.hiplc
  21. Vellum Force/Impacts

    Hi there, I'm trying to acheive an effect in vellum that blasts holes in preTorn cloth. I'm relatively new to Houdini so have been following the Applied Rigids V where I created nice impact blasts of particles along a curve every 4 frames, but I really want a way to apply that force/velocity to my cloth. Any advice, ideas or alternative approaches would be greatly appreciated! Huge thanks, Al
  22. adding detail to Pop sim Houdini

    Hi all, is there a way to add details to Pop sim in Houdini like in this tutorial: Thanks thanks
  23. realistic sparks / embers

    Hey folks, I wanna do some pyro work. To make that look convincing I need realistic sparks. I tested a little bit and watched tutorials, but the sparks are not really convincing. Like it seems there is no temperature and they are way too universal. I would appreciate it if someone would be able to help, because I feel like I searched the whole web and there is no Documentation really. I saw how Rise fx did it for Doctor strange, but that was very briefly (here is the video: https://www.youtube.com/watch?v=I6-HW34e0WA). Im a beginner in Houdini, so dont be rough on me. realistic sparks.hip
  24. Hey folks, I started with Houdini very recently and I wanna focus on fx at first. So after trying with the Shelf tools I wanted to stylize my sims. I looked around the web and followed tutorials on a particle based pyro sim (I wanna do an explosion). The problem is, the pyro sim won't work with my PoP really well. I considered that my particles are too fast maybe and added substeps. But that didn't work out either and I don't know how to fix this thing. I hope you could understand my issue. Help would be much appreciated :^) Impact explosion.hipnc
  25. Hey everyone, I'm trying to create a sim with a circle that's emitting particles from which I create curve trails that are then given string vellum constraints. Up until I add the vellum solver node everything works fine but once the display is set to the solver my geo is no longer visible. I'm not really sure why this is - I'm wondering if it could be to do with the constant stream of particles and there being no real ‘start’ and ‘end’ to the wires? I'm still pretty new to Houdini so there's probably a smarter way of building this, I've attached my file if you've got the time to have a look. Any help would be appreciated. Cheers Vellum_POP_Test_01.hipnc
×