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Found 140 results

  1. Hi all, I am using the new waterline feature in flips in H16. It is working fine at first, but I tried to key the waterline to move up during the simulation and it seems to have no effect. The particles still escape even though they are below the waterline. The simulation only respects the initial waterline level and does not move dynamically as its keyed. Is this normal behavior? Any idea what might be causing this and how to properly move the waterline as the simulation advances? Many Thanks.
  2. Hello all, I'm using Houdini's Wire Solver for my master's thesis on hair simulation. In the text I want to talk about the way hair is being simulated. Based on the parameters the Wire Solver offers, I expect it to simulate Wire Objects like a mass-spring system. When searching the documentation, I can't seem to be able to confirm this. Does anybody here have some confirmation of it using a mass-spring system or have a different intuition about how the Wire Solver works? Thanks for any reactions, Tim
  3. hey houdini users, i'm doing a flip simulation for strawberry falling into chocolate but i cant figure out the right surface tension for viscous fluid and i don't know how houdini calculate Surface Tension or how to find the relation between liquid mass-density and surface tension ? and also does houdini calculate it in millinewton per meter ?
  4. I am trying to generate whitewater in a Flattank using whitewater shelf tool but the result is not proper. the particles are freezing and not following the motion of flip particles and also sometimes they are flickering. I have included a video link to demonstrate the problem. Please help me to solve the issue. best regards, https://drive.google.com/file/d/0B1abbA5_-CZvWHhMbndMTGt2VGM/view?usp=sharing
  5. Hello! help please, the question is I have a DOP simulation with the destruction of the bridge, which is collapsing with a bullet. Can I make a cache of the simulation and load it to another DOP to interaction with the fluid(river) please show how to build node.
  6. Hello, I'm trying to add some variance to the 'strength' attribute of 'glue adjacent pieces'. I tried using 'glue clusters, but I can't seem to get them to reliably affect the 'glue adjacent pieces' strength attribute- the nodes have changed in recent versions of Houdini and set ups from earlier versions don't really translate. Another method I would like to try is using an 'attribute from map' node to apply color from a bitmap, which would be used to multiply the strength attribute in 'glue adjacent pieces', but I'm having trouble setting that up as well. One question for either method is, is the 'glue adjacent pieces' strength attribute global, affecting each glue primitive the same way, or can it be manipulated to affect different glue primitives differently? I'm new at Houdini and would appreciate any info or a push in the right direction. Thanks
  7. Hey guys! I'm new to Houdini and I've ran into a problem which i can't seem to fix. I was hoping someone on the odforce forums would know the problem. I have been trying to make a tool to generate snow. Thanks to a tutorial on snow simulations from cmiVFX and the great documentation from SideFX things went pretty fast, but the last couple of days my simulation seems to collapse/melt whenever it seems to reach some sort of resting point. My intention is to have stable snow which I can make a character walk through. So I want the particles to stop melting away when my simulation stops moving. I added my scene so you guys can take a look. Any ideas on how I could fix this? Many thanks in advance! snow_v18.hipnc
  8. Hi all, is it possible or a way to enable all my GPUs for OpenCL? i have 3x titan-x and a quadro m4000 total of 4 cards. thanks
  9. Houdini tutorial VOL 01 Houdini Training Package number 1: Educator : Amin Sadeghvand | Software : HOUDINI 15.5 | Level : Medium | Duration : 13 hr | Volume : 4.31 GB| Quality : HD | Language : English . Website
  10. I've been asked to quote a job where we would be doing large scale building demolition vfx work. Basically 15 seconds of animation where an old shopping center is destroyed by explosive charges, falls to the ground + lots of smoke and dust. Then a new shopping center rises from the ashes. The animation will be merged with either aerial footage or ground based footage filmed on location. There will be two locations to destroy, so eventually this means 2x 15 second animations. We may have the possibility of drone captured aerial footage of the surrounding location and old shopping center. This may provide the options for photogrammetry reconstruction of the old shopping center. Also we should be able to get our hands on architect viz data, probably max or sketchup files for the new shopping center. I'm looking for some houdini help to run the destruction simulations and smoke effects. I'm a maya guy and need a talented houdini artist to help. If you have experience in this + a reel to show I'd love to take a look and talk.
  11. I'm scratching my head over this issue. My FEM object is slipping through the animated Static Object slowly as it spins. The Static Object is set to "Use Deforming Geometry" and does not act as expected. FEM_slipping_through_StaticObject_slowly.hipnc
  12. Hi there, Victoria here from Glassworks London. We're on the hunt for wonderful houdini artists with an eye for design and a strong ability in simulation work for a luxury brand. We'd love to see reels that can speak to this too, so please feel free to send any work through to victoria@glassworks.co.uk along with your day rate. We're looking for availability for the whole month of May and June, ideally to work onsite in our London office but everyone will be considered. If you're not familiar with our work, please visit glassworks.co.uk to see what our fabulous artists have been up to. Very much looking forward to hearing from you. Thanks!
  13. Hi, I am trying to make particles fly off a moving figure. so for example if he throws his arms in the air i want particles to fly of like sand. What is the best appraoch to this? I have tried using the trail node and attract pop but every time at some point no more particles emmit and just the ones that should fall to the ground are moved by the figure. I put a link to a flipbook render below. thanks test_Two_grain.mov
  14. I am having a couple issues. One i am unable to get mantra to render a single frame. It tells me i have to delete all of my nodes to render. my second issue is that my shattering glass that i cached out is not showing up when i source it into the file node. Also when i link all 6 furniture files, the debris, bricks and pyro explosions that are pre-cached, Houdini crashes. Please have a look at the scene files and advise. RBD_Destruction_Help_File.hipnc Shattering_Glass_cash_File_Help.hipnc
  15. Hi people! I'm learning some things in Houdini to create HDA's for cinema 4d or export vdb's simulations to render in c4d. In this case, I want to make a smoke simulation but I have one basic issue that I'm sure it solves with a simple way. I have one torus emitter inside of a tube but the smoke doesn't respect the tube geometry, It moves through it. How can I fix it? Thanks!!
  16. Hello Everyone, http://www.hossamfx.org/math-in-houdini-vol2/ Hello Everyone, Description: In volume two of Math in Houdini training. We will continue exploring the big role of math in creating visual effects and controlling the simulation behavior and this time we will move to more advanced concepts and provide cool projects. I will explain one of most important physical parameter: the gradient. And show you how to use it in rigging and collision and give you wide idea about using gradient in different operations in Houdini also We will go indepth with matrices and learn cool techniques using the matrix: it is the “Frame of Reference” you must know this magic secret about matrix. If you have many questions about Quaternion parameter, So we will dive into this concept and answer all questions with cool projects and we will see how to create quaternion field to effectparticles motion and if you don’t know what is the Vector 4, we will have cool project about using vector 4 inside the wire solver dynamics. And I will show you how it to build your own cloth simulation from scratch, this part will give wide idea about how the dynamic solvers work and what is the constraint , gravity , and how the collision is calculated ….. and many other math topics. Thank you. Lesson plan WHAT IS THE GRADIENT, AND FOR WHAT !!! all dynamic solvers use Gradient and normal and velocity and collision calculations, all this Physical Parameters use Gradient, you absolutely Know what is the Gradient !!! ? 1. Gradient & Slope Relationship– Are there any relationship between it? 2. It can create Normal – slope can create normal, how? 3. Speed and Velocity calculates –it is awesome how slope can calculates speed for everything. 4. Slope & Dot product in Rigging – No more tutorials about how to Rig the wheel. 5. Gradient of surface – Slope can create Gradient 2D field. MATRIX IN DEPTH !!! we will start by talking about for what we need matrix and next it will be more clear how it is easy to use matrix, and Frame of Reference is strong concept that you must have idea on how to use. 6. Why we created the Matrices – to understand matrices I must know for what it was created. 7. Recreating the Matrix – Now we will see how it is more easy with Matrices. 8. Frame of Reference – it is cool Concept you must know how to use with matrices. QUATERNION, NO MORE QUESTIONS ??? you don't know any thing about quaternion! you will know every thing about it, for what, when to use, how to control and how to build field of quaternion to advect particles. 9. What is the Quaternion – You will Have depth understand of this Scary parameter. 10. Quaternion Field part 1 – Quaternion inside Dynamics can create awesome animation in Particles. 11. Quaternion Field part 2 –How to Keep Particles inside defiened Volume using quaternion attribut VECTOR 4 IS A QUATERNION, ... !!! the orient attribute in the Wire solver is very important and you must know how it work, in this project we will manipulate this Attribute to create procedural dynamic animation. 12. Quaternion & Wire Solver – Big role of Quaternion in wire object. 13. Feelers & Quaternion part 1 –Feelers of insects moving around all the time, we will simulate this motion with quaternion. 14. Feelers & Quaternion part 2 –How to control the physical parameters of feelers to get nice real motion. SIMULATION CODE & COLLISION it is very important to get depth understand of how the Dynamic solvers work, we will see how we can build cloth simulation and add collision to this simulation using the Point VOP and Sop Solver. 15. Apply Gravity –Without any dynamics solvers, we will create our solver and start by adding gravity force to objects using the point vop and sop solver. 16. Create Cloth Force – Define the force spring between cloth object points and create pin constraint for new solver. 17. Gradient & Collision –Gradient of Volume is the way to create collision between objects. ِAll Content With Project Files . Full information Here
  17. Hey friends, I am trying to shade a snow smashing to the wall. What I tried was using VDBfromParticles and then use vdb smooth (median value gave me a best look). However, for the animation. I saw there were some effects when the snowball hitting the wall which make it looks more like a fluid not a snowball. Please note that the erode area which makes it look like a fluid : (. Any suggestions and help I would appreciate! There is a short animation in the attached file. Thx! 0001-0240.avi
  18. I have three individual components to this briefcase, the body, the handle rings and the handle, the body is a static objects and the other two are RBD packed objects, all concave. I am trying to get the handle to hang from the suitcase naturally but they are falling through each other, there is a slight reaction but i cant get them to completely react to each other. I have attached a zip of the three .obj files and the .hip file if anybody could have a look. Any help would be really appreciated ! Thanks! Assets.zip
  19. Hello! I'm trying to kill points inside DOPs (well a popnet actually). The way I'd like to do this is by finding the closest point to the ground object (how do I reference an object in DOPs?) and computing the vector from the POP point to the nearest point, then dotting that onto the ground points normal vector. That's a nice way to figure out which side of the ground the point is on, then killing it. At least that works outside of DOPs. I'm wondering how I can do this inside DOPs because I don't want to post-process kill thousands of points if I can kill them in the simulation. Any ideas? Thanks, cw
  20. Hey, I am caching out my ocean simulation. Inside the dop network I went to the output node and hit save to disk. I cached out around 112 frames. Back in obj level I click on my dop network and hit playback simulation. However, it keeps loading the last frame of the simulation, even if I am on frame 1. The only way to get it to work is to turn off play back simulation, then load ONLY frame 1. Then turn play back simulation on again. After that, I can load the the rest of the cache. As I advance foward on the timeline, it updates as expected. But if I tried to load a previous frame, it won't update. For instance, it I go to frame 10 from frame 1, it updates correctly. But if I try to go back to any frame before 10, it won't update. However, it I go to frame 15, it updates fine. But now nothing before 15 will work. What is going on? thanks
  21. I am having two issues. One i am unable to get mantra to render a single frame. It tells me i have to delete all of my nodes to render. my second issue is that my shattering glass that i cached out is not showing up when i source it into the file node. Please have a look at the scene files and advise. Shattering_Glass_cash_File_Help.hipnc RBD_Destruction_Help_File.hipnc
  22. Hi there! I can't get to work HQueue. All my clinet paired on ready/idle, everything seems fine. When I submit a job, the job fail and I alwyas get only this error message “Could not find output file for job ‘23’.”. All my client can read and write the directory where the .hip file is. Even when everything is configered to default, so everything is pointing at $HIP. The other very strange thing I sliced up my sim to ways and only 1 job apperaring in HQueue. Can anyone point me to a tutorial or something? Thanks! (I have alread yfound the master class on distribution in H15 https://vimeo.com/148518740)
  23. I have a load of RBD packed objects smashing on a Ground Plane, they're all intersecting by a consistent distance through the Ground Plane, the RBD packed objects are all convex hull rather than concave although changing between the two doesn't seem to make a difference. I've tried replacing the Ground Plane with a static box and trying different geo representations on it but that doesn't seem to work either. Any suggestions on how to fix this would be really appreciated! Thanks
  24. I run a pyro simulation (flames), using Houdini 16 non commercial, cached the sim (120 frames) using the import_pyrofields node (save to file->save to disk). I can see the cache in the hard disk 115MB file. But when I try to play in the sim after clicking load from disk, I hear a weird noise (this happened on two different days, the noise has to do playing the simulation), and the sim is completely frozen on the last frame I had played. Even if I go back to frame 1 you would see exactly what in the picture. Any idea what I may be doing wrong? After closing and reopening the file, I no longer hear the noise but the simulation is still frozen on the picture you see no matter what frame I move to.
  25. Hello everyone, so we finally got the full FX license for Houdini and I merrily went about rebuilding a setup that I built in the apprentice version, some FLIP shenanigans. The apprentice version wouldn't simulate when I enabled checkpoints, I thought that was so you can't simulate in apprentice and use the cache in the full version. But now I've got the paid license and the problem persists. I set up the checkpoint file name but no matter what interval or trail length I set, all it ever does is simulate frame 1 and write it to disk, then stop simulating the DOP network, showing me memory cache blue in the playbar and just playing the animation. I'm stumped. Is there anything I'm missing or is it a bug in H16? Any help is appreciated. Thanks in advance Paul