Jump to content

Search the Community

Showing results for tags 'Simulation'.

More search options

  • Search By Tags

    Type tags separated by commas.
  • Search By Author

Content Type


  • 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 334 results

  1. Hy guys, I would like to simulate an air bubble inside a rotating bottle.. Results with vellum are not successfull.. Any hint? Thank you.
  2. I started using Houdini about 2 years ago, recently I have felt a desire to not only share but, hopefully to open up a discussion about the explorations undertaken in the work. The first post is therefore a look at how it began. The work started with an idea of looking into systems of growth and the procedural simulation of that growth. The question of landscape surveillance and 'fertility' arose - can a landscape (or object) topology be evaluated for growth? In this case the landscape would be a scanned model of a terrain, converted from pointcloud to mesh data and thus reinterpreted as a topology of points and primitives with certain inherent attributes: Position (vector), Normals (vector), and curvature (scalar) predominantly. The simulation can then search for 'flatness' and eliminate areas of surface beyond a limit of acceptability. The surface is then displaced whilst maintaining ties to the remainder, this seemed to mirror a process not too dissimilar to inflation (although much more noisy and undefined), always using the retopologised mesh (and thus recalculated attributes) as a driver for the next frame of growth. The video and images below are examples of the earliest explorations (and failures) of this theme, first applied to a modelled object, with the video then moving onto a landscape: https://vimeo.com/376861116
  3. Hair Guide Transfer Issues

    Hey guys, I'm still fairly new to Houdini and I am trying to make a hair sim for a character on a short film I'm on. I have created my groom on a static mesh of the character and I want to transfer it to the animated mesh. I've imported an alembic cache from Maya, matched topologies with the static mesh, cached that matched mesh out, then brought it back in. I want to transfer the guides to this newly cached mesh, but when I use the guide transfer node, it creates multiple instances of my groom and scatters them around the space. I have also tried the vellum constraint option "attach to geometry" with only the root points selected, hoping the rest of the curves will follow but only the root points moved. Not only that, but they didn't spread across the mesh to their correct position. At this point, I'm not really sure what to do anymore. Any recommendations are welcome. I can attach the file too but I'm not sure if that would be much use since you would need the cache files too.
  4. Tree Rig / Asset + Tree Sample Now In Patreon I happy to share one of my latest houdini digital assets , Tree Rig . the idea came from simulating tree with pyro to make a photorealstic look Patreon Link : https://www.patreon.com/posts/31800923 Viemo Links : https://vimeo.com/356351056 py Tool + asset : https://vimeo.com/322402973 Stadningmanpage : https://www.facebook.com/standingmanfx
  5. Trying without much luck to recreate the video wedging mosaic demoed by Scott Keating here https://www.sidefx.com/products/pdg/ For some peculiar reason the video is not directly linkable and there is no .hip file but it is halfway down the page in the AUTOMATE section, Wedging video. I am trying to create the TOPs node graph in the attached but not sure what all the nodes are. In the left column green box of course is a ROP geometry output , and in the right column red box there are 5 nodes. #1 is ROP Fetch I think, #s 4 and 5 are Wait For All and I think FFMPEG Encode Video respectively. But what are numbers 2 and 3 in the right column, Generate_Contact_Sheet Wait_for_Entire_Sequence ? Also anyone know of a working example of TOPs based video mosaic for simulations?
  6. 32GB Ram 3200mhz ryzen 5 1600 Hi again guys. Basically I have been struggling a lot with cacheing a simulation. I´ve tried .bgeo .sim and multiple resolutions on the pyro I would hate to keep lowering the res because of ram issues. I diseabled "Cache Simulation" and I still keep on feeling my Cache. I dont mind waiting days for the cache if necesary (it is a big simulation, probably 40 meters long I guess) and to be honest, I might not know in depth how to control pyros. Hopefully you can help me here
  7. Hello, I'm sure my title for this post could be clearer, so for visualization purposes, say I have a field of discs that are RBD Packed Objects on the XZ plane, and above them there's a sphere with gravity: Normally the sphere would fall onto the discs and the discs would act more or less like a ground object, but I'm trying to have the discs raise up depending on each one's respective distance to the sphere. So far I've found that the positions of the discs (RBD Packed Objects) can be controlled in a sop solver within the dopnet, but I have no idea how to reference the position of the simulated geometry (the sphere) to inform the discs' positions. Can anyone show me the way? My ultimate goal is to eventually replicate the desired effect with the sphere being a vellum object.. would that require a different workflow? Here's my setup so far that may or may not save you a minute: sample.hipnc Thanks for taking a look!
  8. Floating Fountain

    A passion project re-using footage shot a few years ago. The water is split into two sims: the first covering the sphere and the downward stream, the other filling the basin and overflowing around the sides. A total of over 7 million particles make up the fluid sim. Software used: Houdini Redshift Nuke
  9. Hi, I am specialized in Houdini FX, Simulations (flip, pyro, RBD Bullet), VEX and Python scripting also a good experience in lighting and compositing. Currently based in Shenzhen, China (willing to relocate worldwide). you can checkout my vimeo for my work and contact me on LinkedIn. Available for freelance/full-time Houdini FX work and Houdini pipeline development. Thanks, Mahesh MS. vimeo: https://vimeo.com/maxcolor/ LinkedIn: https://www.linkedin.com/in/maxcolor/ email: msmahesh@live.com
  10. How to shatter animated objects?

    Hey there guys! I was playing with a little Mixamo animation I downloaded. The animation consists of a dude falling down, I want it to fracture when he falls down and have a little control over that. So I tried to import the Mixamo, convert it, file cache it and apply a simple RBD glued sim. I changed the source to be a deforming active object so the shattering applies to the animated mesh. I tried to play with the glue parameters to have more control over when I want the guy to shatter but the only results I'm getting are crashes, so I obviously think I'm missing something. Here I attach the file and the fbx. Any ideas? Thank you! Trapo. shattering_animation_01.hipncFalling Down (1).fbx
  11. I (beginner in FLIP Fluid) have a FLIP simulation that gets crazy when I add a collision (static object) I use the test geometry shaderball, used 2 spheres with mountain sop, boolean with front and back of the shaderball. The two deformed spheres are the source. The rest (boolean difference) of the shaderball is the collision. Flipbook Without collision https://streamable.com/qkh2p Flipbook With collision https://streamable.com/922a6 Ii feel it has something to do with possible intersection between particles and collision geo, so I reduced the size of the sphere to leave a gap with the collision geo but the flip sim is still going crazy. Any idea? Issue with FLIP simulation.hiplc
  12. Hello! So I have been Having lots of problems to setup the pyro sim on a large scale. Somehow I cant manage to understand the propper settings. I would love a result similar to this: The size of the my sim is 1:10th of the real size because as I make the sim bigger the problems also get bigger. I guess it has something to do with the source density and the smoke object Take a look on how awful it looks down below (I am quite new to this soft) I am leaving the whole proyect full of notes so you have an easy time helping me Thanks a lot and I am looking forward to learning. cya NaveVolando.rar
  13. Recent work from Chinese animated feature 哪吒 (NeZha), I was responsible for creating and rendering of the water effects using Houdini flip to build a guided system for water and render in Mantra, final compositing done in Nuke.
  14. Hello! So I have been Having lots of problems to setup the pyro sim on a large scale. Somehow I cant manage to understand the propper settings. I would love a result similar to this: The size of the my sim is 1:10th of the real size because as I make the sim bigger the problems also get bigger. I guess it has something to do with the source density and the smoke object Take a look on how awful it looks down below (I am quite new to this soft) I am leaving the whole proyect full of notes so you have an easy time helping me Thanks a lot and I am looking forward to learning. cya NaveVolando.rar
  15. FLIP SIM - How to stop bubbling

    Hi! Houdini beginner here. I'm learning FLIP sim and having trouble with it "bubbling" at the end. It's a water-filled glass breaking (bubbling_question.mp4). Towards the end, the liquid is constantly moving and is creating this "bubbling" look. I've tried adding a POP Speed Limit after certain frame, or setting POP Velocity to 0 after certain frame, but nothing seems to work. How can I fix this? (I attached the hip file but I'm not sure if it'll work due to missing geos and caches: bubbling_question.hipnc) Thank you! -Y
  16. Hi Everyone, I'm a student and I'm working on a project in which I need to recreate a scene similar to a Venice's canal. So I'll have buldings on both sides and water between them. There will be also a flying object that will fall and collide with water. This is the first time I work with water inside Houdini. What I need to know is what is the best workflow? I'll create a custom geometry in Maya for the container of the water, it will be an irregular shape. How do I set it as a container? Since there will be a collision, I think the best solution for water is to use FLIP fluids, right? Also if I use this way I will have many particles, so what is the best way to proceed in terms of memory, simulation and rendering? Attached you can find a really rough sketch of the idea. Thanks in advance.
  17. Retime simulation

    What is the best way to retime and control the speed of a simulation? My desired effect is high speed and upon collision slowing down like 100 times for 5 seconds and then go back to the original speed. retime.hiplc
  18. DOP to POP

    Hi guys! Just looking for a little bit of help, to see if what I am trying to achieve is actually possible and if it is maybe someone could assist me in figuring it out! I have attached my file below, I am attempting to make a Volcano react. This is the reference I am trying to copy to the best of my limited abilities! https://www.youtube.com/watch?v=9Plj4b79cwg My question is in regards to the node named SIMULATION, ignore the first DOP for the first smoke. I am working on the out put from the lava, now everything looks horrible, but I am trying to get the set up to work so I can edit things all at the same time (Uni assignment, short time frame, was recommended to do it this way.) Anyways I have the 'Lava' moving kind of how I would like for now and I now want to take the movement of the lava and turn it into particles to put into a POP to create small particles/sparks. I am certain this could be done. But I cannot wrap my head around how to achieve it, I got it done for the secondary smoke from the lava plugging the output into a pyro, which I haven't edited yet so that reaction is a bit of a mess. But I want to figure this out before moving on! Any help or recommendations would be hugely helpful! Or even if you know of any tutorials that walk through this? As I haven't come across any.... Thanks! Assign07e2.hipnc
  19. Emit Time Range till End Point

    Hey Guys, i got a question. I got a vellum sim and i am emitting every 8th Frame one sphere into my sim. I did it with -> $FF % 8 == 1 but now i want that emission just between Frame 1 - Frame 48. So between F1 and F48 i want every 8th Frame an emission. How can i get this with an expression? Cheers and Thanks!
  20. Hi When simulation cloth I often think that adding some thickness to the cloth looks much better then just rendering a flat plane. But what is best practices when adding thickness? To extrude the plane before simulating and adding load on the simulation, or adding it afterwards? I am asking this because I am having a hard time controlling uvs, intersections and adding bevel to the plane after its simulated, because it is in constant change...
  21. How to make Vellum follow animation?

    Hi guys, Finally migrating from Softimage to Houdini:) Got a dumb question. I just need to attach the vellum cloth simulation to alelmbic animation. It's going to be like a peeling effect constrained to an animated object's position and rotation. Can you please point me which tool should I use? I've tried with Fetch on an object level, but the vellum doesn't react to it at all. Thanks in advance! testAnimObj.abc temp.hip
  22. While setting up vellum constraints, I used the preset: "configure balloon". It created both vellum constraints: cloth and pressure, with both nodes sharing the same "stretch" properties. After some testing, I realized that both "Stifness" and "Damping Ratio" could be set to 0 within the cloth constraint, as long as the pressure constraint had non-zero values on both parameters and things would be exactly the same. But on the other hand, if I tweaked the "Rest Length Scale" and "Compression Stiffness" parameters on the cloth constraint, this would have an impact. Why do some values on the cloth constraint are overriden by the pressure constraint (wich comes right after the cloth) and others aren't? Cheers, Diogo
  23. Hi there I made some snow with very small vellum grains What Im trying to achieve is to set an initial state when my snow is already relaxed (I am throwing a box made of grains in top of a mountain), and then to continue colliding with some objects. How can i make the simulation read the first frame and then start writing the next
  24. Hello, I have a question but I haven't found away to solve it , I want to instance soft bodies to a particle system that is constantly generating particles (constantly changing the numer of particles). That could be with FEM , grains or vellum you name it. which would be the best approach to do that, so far I faked the effect with the analytic foam tutorial on Entagma, but yet it is missing a lot of the motion I am looking for. Thank you for your help!