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Found 283 results

  1. Hey guys, having trouble getting a ragdoll simulation to work, I have everything set up working great except the collisions on my mesh. It looks fine in the preview, but then joints stick together and the feet fall off and stick to the floor. Any ideas?
  2. Hey everyone, So just started deadline for Houdini and I've managed to send my rop output to deadline for rendering but when I explore the output file path, it shows file does not exist. However, when selecting the explore file path, it opens the correct pointed file directory where I want my caches & renders to be at. It does work if I copy & paste the output file path I'm using $JOB for all my files since I'm working, rendering, caching off our servers. Our IT guy have no clue on why it's behaving like this as well therefore would be best if anyone can guide me in setting up deadline? Screenshots attached H16.0.633 | Deadline 10.0.19.0
  3. Fire on the ceiling

    Hi everyone, I'm currently trying to create an effect of fire burning under a ceiling, looking something like this: http://footage.framepool.com/en/shot/774901137-explosive-flame-fire-disaster-ceiling-fire-blaze As far as I understand the phenomenon there is a layer of gas floating between the air below and the ceiling above. It gets ignited and starts burning at the interface between air and gas. The flames rising up create this kind of nodule structure by constricting the gas into little pockets. This is the theory but I'm completely stumped on how to create the actual effect. I've tried creating little pockets of fuel but the pyro sim simply burns into them, disregarding the fact that there should be no air that makes combustion possible. Does anyone have some experience with this kind of simulation or at least an idea how to tackle it? Any help is appreciated. Thanks in advance Paul
  4. Sulaiman - Compositing/Houdini FX

    Hi everyone! I am a VFX Artist who just recently graduated from 3dsense Media School who specialises in a wide range of skillsets Below is a Vimeo link to my showreel as well as my submission to The Rookies! Do feel free to drop me a message, thank you! Contact me and check my channels: sulaimanwar18@gmail.com https://linkedin.com/in/sulaimanwar/ https://www.artstation.com/sulaimanwar =================================== https://vimeo.com/325603170 https://www.therookies.co/entries/427 FinalProject10.mov
  5. Hi everyone, my name is Tomás and I'm new to the forum. I'm creating a fur sim for a chimpanzee using the Guide Simulate node with the Vellum solver. The chimpanzee will later be animated. The sim works fine but I can't find a way to make it keep its wild messy look. The guides do keep their shape (bend, guideinit, etc) because I increased the constraint iterations and the bend stiffness. But I can't find a way to make the hairs keep their direction. In other words, once the gravity affects the guides they all go too down. So I want a way to keep the original shape of the hair a bit more. I could tone down gravity or the mass of the guides but that would make it look as if it's underwater or something once I animate the chimpanzee. Increasing the constraint iterations to a ridiculous value would maybe fix this but at a high cost to sim time, same for stubsteps. Increasing Bend Stiffness to billions and billions doesn't seem to help either. Obviously, I don't want the hair to be hard as rock. I want it to behave this way because it's light, strong and covered in dust and sweat, if that makes sense. It's also important to note I committed the noobie mistake of not resizing my mesh after exporting from Maya which works with different centimeters instead of meters. Meaning my monkey was more than 100 meters tall. I believe I already fixed this by going to preferences>Hip file options but I did this after creating the simulation so I'm not entirely sure if everything was resized correctly. Attached are 5 images: the guides at frame 1, the guides at frame 73 (3 seconds into the sim), a render of the fur at frame 1 (the way I like it), a render of the fur at frame 73 (the way I dislike it) and a reference image for the sort of hair I'm aiming for. I also added the project folder. ApeODForce.zip Thanks in advance!
  6. Dear Friends, I'm emitting FEM objects into a simulation. Since on a given frame I generate at most one object, I don't need stamping to produce variations, it is enough to animate the initial state. My problem is that these objects share the same rest position, which I would like to vary instead. Is there a way to stamp a variable based on the DOP object currently copying the rest positions to the simulation geometry? In other words is there a function that gives a stable but varying value across objects when a DOP simulation reaches out for rest geometry? Thanks in advance! BMT
  7. I'm having a problem with a RBD simulation. I followed Applied Houdini Rigids 3 for the setup and everything finally worked. Now I would like to work on an actual scene, using an animated alembic instead of animating in houdini with a null. But I can't see what to change or to adapt in the setup to get Houdini to read this animation and make the switch to physics work like in the original setup. Importing my abc and switching every cache to store a frame range instead of a single one might mess with the constraint system, any ideas?
  8. slicing object while simulating

    I'm trying to slice an object during a rigid body simulation. imagine a fruit falling through a grid of laser beam. the object is supposed to be sliced in multiple pieces. i can't pre-crack the geometry as the fragments depend on how the object hits the lasers. like this,
  9. Hi; In a vellum cloth simulation, I need to keep the original shape of my cloth object as much as possible. I tried to increase bend stiffness and stretch stiffness but it doesn't works. Later, I would like to paint an attribute like "stretchstiffness" on that cloth, to control areas that I want to be more stretched... Thanks. BaseMesh.bgeo Vellum_Cloth_01.hip
  10. I was trying to make a river to learn how to use FLIP Fluids and Houdini in general. I came across a tutorial and followed up, but when I tried to apply that tutorial to the geometry i wanted to it didn't work the same i look more like an ocean or a lake. Also here is when i realized that the tutorial only works correctly on a straight path along the X Axis. When tried to do it in other direction the sim still goes in the X Axis instead the intended direction. Can somebody give me a hint or some help on how to correct this? Or maybe an idea on how I can do this? Thanks in advanced. River.hipnc river.mp4
  11. Houdini RDB Simulation Setup

    Hi Odforce members, I have a fairly simple (I hope) Houdini simulation project setup I need tackling by an experienced Houdini artist/TD. This is a paid project at US/UK rates. I'm an experienced 3D animator but a novice Houdini user and I need to outsource this part of a project I'm working on due the fairly unique use case (at least to me) of the simulation setup I need for this particular project. Essentially, I need a .hip network that spawns pre-fractured RBDs, that break into fractured pieces only when contacting specific animated geometry i.e. a grinding screen, high rpm pulverizer etc The deliverable would be a houdini indie .hip file I can plug 2 alembic sequences into. One for the passive bodies / sim container. The other for the active bodies that will shatter the spawned RBDs on contact. Ideally I could also set a starting velocity for the RBDs, other than default gravity, but that would be an extension goal. As far as I can tell, such setups are possible to achieve and I have been able to find and modify the example .hip attached to this message. I'm looking for basically the same behavior you see when the particles hit the ground plane in the .hip file. The particles don't shatter when they collide with each other, but they do when they hit the ground. As understand it, it's setup in this file so each spawned particle is a pre-fractured RBD sphere, with some kind of glue force holding the pieces together until another object in the sim impacts the particle at a velocity high enough to cause the glue forces to break. Ideally I'm looking for the glue forces to break only when contacting specific geometry. However if this is technically un-achievable (please feel free to advise), I'd need a global attribute / input clearly shown in the top level node graph that would allow me to control the velocity setting / threshold to trigger the shattering. The pre-fractured RBD should be no more than 8 total objects, to keep the sim time as low as possible. I'm also not looking for you to run the sim as I'll need to tweak the settings as needed. If you think this is something you'd be able to tackle, please send a quote to adam@renderkick.co.uk If you are able to send me a screen capture of the working setup before payment is made that would be preferred (don't worry you can keep your node graph hidden! I'm not looking to rip anyone off!). I'm working to a pretty tight deadline, so I'd need the files delivering no later than Thursday 14th March. Hope to hear back from some of you soon. Thanks Adam fracture_test_v3.hipnc
  12. Gas Linear Combination

    I created a gaslinearcombination node and set the Destination field as vel, and in the combine operation I set to multiply source1: friction and source2: vel. friction is a custom scalar field created by me, with a 3D noise. The gaslinearcombination doesn't work as expected. On the other hand, a simple gasfieldwrangle with the following vex code: " v@vel *= f@friction; " does the trick. Why isn't the gaslinearcombination working?
  13. Keyframed Grains

    Hello! I'm a new user of Houdini and I'm trying to do a stuff like this (https://gfycat.com/aptdishonestcow), using a fbx animated character. Im using grains (granular solid) to do the simulation, but i don't know how to start the simulation only at the desired point (The character start running and falls on the ground. I want to enable just when he falls) Someone can help me to do this step by step?
  14. Hi, I am doing a smoke sim. The sim is too large and so I can't simulate the entire sim in one go. I had checked the checkpoint option and gave a valid path to save the checkpoints files then simed half of the simulation and had closed houdini. I want to sim the rest of the simulation but where do I put the .sim files that are generated by the checkpoint so that the sim runs from a certain frame and not from frame 1 all over again?
  15. Hey, all I have a basic voronoi fracture sim, so then I have add derbis and after that billowy smoke... all works fine I can see the smoke from the debris in the viewport, but I CAN'T see the smoke in my render view? what I make wrong??? Problem render smoke as debris.hipnc
  16. How do I apply noises etc using the gas field vop in an explosion? Seem to be getting weird results when just applying an anti alias flow noise.
  17. Organic cell growth Inside

    Hey there, I Have a setup going that I followed from the Entagma Patreon page. It's a cell growth system based on VDB's. and VDB analysis. I got it working so it's colliding with an object outwards. But what if I want a pighead for example and place the cells inside? Basically, how do I invert this setup so the cells grow inside an object and collide? I think I'm overthinking this one and I need some help here. Cheers! BubblePush_v3_odforce1.hip
  18. FLIP unstable border particles

    I am trying to get a calm puddle, and I have managed to achieve that in most of the fluid. Still, I can't get rid of this moving particles at the boundaries.... I've tried deleting them, but new ones will start moving until they get there... puddle_02.mov
  19. Magnetic iron filings

    Hi, has anyone tried to setup a magnetic iron filings simulation to get something like this: I'm still in brainstorming mode, so any ideas are welcome. Thanks
  20. Distributed pyrofx simulation

    Hi magicians I am new there and need help about distributed simulation pyrofx (huge size tornado) i want to simulate by deadline on farm, how it is possible ?? or is there any other way for this?
  21. Contract A Rope (Vellum)

    Hey guys! I want to create a simulation similar to this one, where the ropes contract and interact with a softbody: I'm well aware that he used c4d for his simulations but I would like to replicate it in Houdini, probably with the new vellum tools. But I can't seem to find a way to contract a vellum cloth sim, animating the rest length from 1 to 0 doesn't do the trick. Any hints on how to achieve a result like that? I'm open to other solutions as well if vellum isn't the right choice for a sim like that.
  22. Houdini Pyro OpenCL Error

    Getting an error when trying to run a pyro sim with openCL: "gasturbulence1: Error: compute_turbulence_cl: Error: smokeobject1 - /obj/geo1/dopnet1/pyrosolver1/gasturbulence1/compute_turbulence_cl: Fields must be matching for OpenCL " Any ideas?
  23. I am trying to recreate this effect, and I can't find any info on how this techniques were implemented… Any help ? Thanks, Diogo
  24. How are you managing your caches? If I have 4-5 sims that builds on top of each other, all of them has a cache, and I change something in the first sim, I need to go and re-cache all the other caches (That maybe are located different places in my network). Are there a way to manage this "chain" of caches, so it's possible to have a better overview of all caches in the sim, and be able to quickly re-cache the sims that need it? What is a good workflow for this?
  25. Hello fellow artists! Example: I have a packed geo, like whale body (in some reason I must leave it packed) also have multiple harpoons (I'm doing simple particle sim and copying harpoon geo on it afterward). Now I'm looking a way how to make harpoons stick to whale's body after collision. It have to follow body movement (It's animated, of course). I guess it somehow has to inherit position, N etc. Not sure even about general workflow. Current step: I'm calculating intersects and can get intersect positions, but what should I do next? Any ideas would be apreciated!
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