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Found 244 results

  1. Hello, When I run a simulation the blue bar always starts disappearing from the beginning of the timeline. As a result, I can not scrub all the way through my sim. Is this normal behavior or is there some setting that can be changed? -houdini version 17.5
  2. Dear all, The plot : -> Am currently simulating a simple shatter with rbdPacked prims + Constraints Glue + a gorund plane, all into a DOP. (nothing Awesome till here). The Questions : -> But, strangely, the little rbds continue to vibrate once fallen on the ground. It looks like continuous vibrating tiny giggly wiggly inter-collisions. Did any body ever had this ? Would it be possible, i've to FORCE STOP them using a desactivating VEX snippet in a DOP/geomety wrangle node ? If anybody had this one time, let me know, please. You will be welcome and it will be pleasure to discuss that point you. Thank you all a lot, cheers.
  3. Smoke follow (fast) animated curve

    Hey Everyone, i'm hoping someone could help me with this problem. In a nutshell, i need to move smoke down an animated path, so that it sticks really tightly to the paths animation, but with all the dynamism a smoke sim brings to the table, i.e. nice peeling away around all the edges etc - I have a fairly fast moving alembic curve - cached out with 10 substeps. (may not be needed but there if i do) - I am using pops with curve force to fire particles down the path, so they follow the curve closely. - Then im using the particles to source density, and also adding their velocity into the sim so that it makes the smoke move along the curve. - Im using a high dissipation value so that i can tighten up the expansion so you can really get a sense of where the curve is / maintain the shape. My issues lie generally in 2 places: 1. Where the animated curve is moving the most - the smoke / velocities struggle to catch up and i end up with a hard edge. 2. Where the curve is tangentially facing inwards in relation to the curve, the velocities 'add' the other way, also creating a hard edge. To try and illustrate what im after - if i could animate a regular smoke sim down a straight path and then warp it into an animated spline shape / spline wrap effect, this would be the best way to achieve it, but im really not sure if is possible - hence this approach. I have already tried upping substeps - but it didnt make any difference. My gut feeling is that the problem lies within how i am sourcing the velocity. I will point out that i am very much in my houdini infancy, so my ability to problem solve isn't great (yet!) Has anyone worked on a similar effect before, or does anyone have any tips/tricks/tuts on how to achieve what im after? Any/All help very much appreciated! Cheers, C SmokeAlongCurve.mp4
  4. Hello to all people :)! I’m trying to do a few days, a whitewater that surrounds my boats, creating the tip of a wave at the front of the boat, a little like this example ... https://forums.odforce.net/topic/28940-flat-tank/?tab=comments#comment-164200 or that one (Really a defined shape of the whitewater fallowing the boat from the front to the back.The problem, here ... I can not see why the whitewater does not seem to be done and do not keep the shape of the same smaller boats ...) I would also like to know ... how to bake my simulations in order to have an ocean that included my simulations of my boats, with also my whitewater :)? Thank you in advance for your help :)!! (P.S, here is my scene) Boat_Breack_waves_V010.hip
  5. Tips for Eye Candy Fluid sims

    Hello there good people, Do you guys have any tips on creating eye candy fluid sims, Specially Flip liquid Sims? Thanks in advance.
  6. Digital asset download at Orbolt! Enjoy https://www.orbolt.com/asset/RodTD::Rod_vdb_averaging
  7. Hello, I'm just getting into vellum and the solver seems fast and cool but I'm trying a sim here where the geometry tries to attach to its collision geo, but that ends up being very jittery at the end with what seems to be no loss of energy. I've uploaded a scene file. I've tried to set @v to zero at the end and that still hasn't worked. What're the steps to making this solver behave? vellum_basics__jitter_02.hip
  8. Hello odforcers I'm a new user here and I would like to make couple of simple questions for advanced users, or at least I hope it's simple. So I will be investing my time into learning destruction with houdini and I know at some point I will need to do smoke simulation. Will be upgrading my pc soon. Is 64gb of ram enough to make anything decent smoke sim wise? Will I benefit having 2tb of nvme drives for caching? Will 64 gb be enough to make the sims of this scale? What is more important Frequency or Latency? Example : https://youtu.be/0d5L-AmABDU Example : https://youtu.be/qBS4bpWAY9g
  9. Vellum tangled office blinds

    Hi there, This is a bit out there but I'm trying to remake this effect produced in cinema4d using Vellum: The blinds were simulated then looped and baked to an alembic, then I attached the strings to the edges simulated them, making them loop using a pose morph tag. I was wondering if there is a way to do this in Vellum all at once having the strings effect the movement of the blinds, with the whole thing being a seamless loop. Basic starting point for vellum would be a simple flag I know, but does anyone know any tutorials that would cover attaching multiple cloths together with vellum hairs? Many thanks, H
  10. Hello, I'm trying to create an effect very similar to the one in the reference video, where particles move through this channel and creep over this bubble. I tried different approaches like vellum grains, regular particles and came closest with the lava shelf tool. But then the individual particles are not touching the surface of the bubble and the overall movement of the particles looks too much like a fluid. I actually want the distance between the particles to stay constant. I think some PBD approach would work best, but can't quite figure it out. Any ideas? Thanks in advance. J NanoParticleEffect.mp4 190524_NanoParticles.hiplc
  11. Hello! I have recently been offered my FIRST FX job! I am familiar with Maya, and some Max, but this job requires that i use Houdini, so now i am all in! VERY EXCITED!!! I have a scene where i have to make some letters rise from sand. The issue is that i cannot get things to collide correctly. Doing my research i have tried using it as a RBD object, and using a trail sop to computer its velocity, but i still dont see any collisions. I use static object, pointing to a VDB smooth as the proxy geo, and all of the collision detection/mode set to volume, but no collisions still. I set the sim up with an initial state file too. Could that be the issue? When i take away the VDB to polygons and VDB smooth, delete and just run the sim as a regular static object, everything works! But...i get some weird artifacts rendering. What is the best approach to this method in Houdini? Im sure the solution is just a setting away, but im lost here. Any suggestions? LetterSetup_001_collProbs.hip
  12. 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?
  13. 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
  14. 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
  15. 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
  16. 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!
  17. 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
  18. 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?
  19. 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,
  20. 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
  21. 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
  22. 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
  23. 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?
  24. 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?
  25. 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?
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