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Found 207 results

  1. I've been working on trying to solve a problem that probably has several ways to attack it... but I can't seem to figure this out. I'm trying to have an animated object that rocks back and forth, and inside of that object is a hinge constraint that ideally would follow the object and let the gravity node do its thing. I the example file, Imagine a sailboat on the seas, rocking back and forth on the waves, and the boom rocks swings based on the boat's motion. I've attached a hip file to show my train of thought. Any help is appreciated. hinge_test.hiplc
  2. Hello, I feel ashamed to ask this as it sounds so trivial but somehow I don't find any answer online, or I do not formulate well what I am looking for. I have cached my simulation but I do not figure out how to sequence together parts of it from different camera angle and then render it out all together. For example, I would like camera1 to record my sim from frame 1 to 50 and then camera2 record from frame 100 to 150 and sequence them together to create one animation sequence that I can send to Mantra. What is the proper workflow. I am really lost. I tried with a camera switch but this doesn't seem right. Thanks a lot guys
  3. Hi all, I need to generate an integer attribute on points that switches between 0 and 1 across a frame range like this: so the length of the spans is driven by a min/max, and their distribution is then randomly scattered across the frame range. This also need to be different for each new point as they are born . Could anyone help me break down what I need to do this in vex/vops? I was told to look into arrays and while loops which is well beyond my current VEX level. Many thanks, H
  4. Hi! First post here. After months of lurking and picking up tips from other users topics I need more direct help. I'm quite new to Houdini and I hope you share some ideas. With given FBX meshes, I have to simulate a gate being rammed out from a wall. Chunks of portal around the gate are supposed to be pulled out with it, hit the ground and crumble into bricks while the rest collapses. Gate itself is animated with bones, not physics-driven. After many experiments, I couldn't achieve that two-step fracture (big pieces falling on impact and then crumbling). This is what I've already tried: 1. I've split all wall FBX into bricks using Voronoi fracture fed with array of points (four pieces total: the portal, left, right and top parts of the wall). 2. I've divided the portal into chunks by grouping fractured elements with separate glue constraints. 3. I've created set of constraints for each piece.). 4. I've constrained all parts of the portal to the animated gate. 5. I've imported gate and wall as RDB Packed Objects to a DOP and fed it to bullet solver. 6. I've set up constraints networks for each piece with SOP solvers connected. The idea was that the portal is connected to the gate by glue constraint with infinite strength (-1) and pulled that way out of the wall. After few frames the constraint is severed by deleting lines in SOP solver. Constraints for individual chunks remain until they are broken by impact with ground. Meanwhile the result is that: when portal-gate constraint is removed while the portal is still in the wall, it's being abruptly shot upward. It looks like the animation (which I can't alter) forces meshes to overlap, so they pop when it loses control over them. When the constraint is removed few frames later when the portal doesn't collide with anything, it gains such high acceleration already, that bricks spray all around as if it has been an explosion. I suspect that my pipeline my be noobish, but I couldn't find any resources on similar cases. Unfortunately I can't share screenshots nor files as they are part of a commission. I'll appreciate your help.
  5. BulletSolver Problem

    Hello, I have noob question. I'm animating the sphere collision by keyframe. But, I get some errors and the collision goes through the active object. Particularly, "Target geometry does not contain a name point attribute" error message is strange... Is there anything way for fix to these...? Thank you Destruct Bullet.hipnc
  6. Hello, I've been working on an RBD simulation on an animated human object, but I'm having a problem blending between the animating geometry and the active simulation. Since it did not work in a SOP Solver, I tried using a Solver outside of the DOP in order to manually update the @deforming and @active attributes. However, that did not work either. I'm wondering if there was an issue in the way I was packing the geometry, or maybe in the way I was assigning the attributes. I would really appreciate your help. Thank you! rbd_sim_cleanup.zip
  7. EDIT: Just doing a clean up; So I'm looking to import CFD data in order to drive a particle simulation in Houdini. So far I've managed to import the data through the Import Table Node. Get position values from 1 ID Group according to all ID's and even for one instance animated a sphere along the point positions of 1 group. 1 ID value. Does anyone know where I should be going from here? Which node groups I should be looking at? What would be my ultimate goal would be to use this data tot drive a particle simulation, eg each id relates to a particle and it moves along the corresponding positional and velocity information contained in the CSV. As always any and all help is greatly appreciated. Kindest regards, Chris Particle_Test_CFD.csv
  8. Offsetting Animation in VEX

    Hey there Od Force community - I posted this on the Houdini forum as well, apologies for the double post, very curious about how to solve this! First post here, I have appreciated all the help I have gotten from this forum while learning Houdini. I am easing my way into VEX and am running into a wall with this seemingly simple task. I am using curves to create Sweeps, I then use a Carve to animate the sweeps based on frame range. My trouble is that I would like to have each Carve animate as follows: 1. Each Carve “Second V” pick a random frame between 1 - 40 to start 2. “Second V” Animate from 0 - 1 over a period of time (Random time length from 10 - 50 frames) 3. Have First V follow behind Resulting in randomly animated carves or sweeps. If there is a way to do this with CHOPS or any other technique I would love to find out. In the example attached I have set up a partial scene. Ideally, this method above would be applied to thousands of strokes with varying lengths! Any VEX help would killer - really trying to get through this learning curve! -Patrick sweep_vex2.hiplc
  9. Hi everyone, I am trying to get to see the camera handles and motion path at the same time, unfortunately seems i can not do it, this is very helpful while animating the camera however it seems i am doing somrthing wrong in this regard here is what i mean exactly: please see attachment grab01.mkv in addition to that a few more "whys": 1. why the motion path doesnt show first and last keyframe's tangents 2. why the camera frustrum handle moves to the "not visible" motion path @1:19 mark on the attached srenngrab 3. why do i have an alleged "orphan keyframe" on the motion path on frame "49" while there is no keyframe on that frame PS: that being said i must admit i do not understand the hudini handles' full potential yet, still studying it. I hope someone magical has the answers/ solutions thanks in advance!
  10. Hi guys, I can't make motion vector working in my scene even with a wrangler point to activate it.. Any help? Thank you. MotionVector.hip
  11. Hello, I asked the exact same question in the official houdini forum and got no answer yet, hope that's no problem I'm trying to make an object follow a path created from points (positions imported from an external file) with a velocity based on the distance of subsequent points. I used the method of creating a line from the points and constrain the object to it. Then I calculated the distance between subsequent points in a wrangle inside the path-geometry node and stored it as a velocity attribute. My idea was to somehow “channel” the velocity to the position parameter of the constraint path, but I don't know how to do that. I'm new to houdini and therefore assume there is a much better way to do all of this. Maybe one can create an entire animation path with the velocity information directly from the imported point positions. Reading several documentations about velocity attributes did not help… Thanks, Lukas positions.csv simple_pendulum.hipnc
  12. timeshift last frame

    alt link for hip how can i extend the existence of the last frame of a cached sequence? see attached HIP sorry for this question. i vaguely remember that this is done with a timeshift sop, but cannot workout how to do it. timeshift frame 30 to frame 31 and beyond. anim_demo.zip
  13. Animation curve node

    Hi all, I was wondering, everything in Houdini is node base, right! So when we create a keyframe animation does Houdini creates on the back a node that holds the animation curve data? If so how can we access it? Thanks
  14. Hi; I tried to make some animation using CHOPs based on a tutorial from "Peter Quint" (https://www.youtube.com/watch?v=4tGCG5u1jwI), but I got some problems with the rotation, so as you can see in the image below, my box rotation jumps on some frames, and it's starting rotation is wrong! How can I fix it? Thanks for helping. CHOPs animation_01.hip
  15. Hey People, so as the title says I am doing a rigged character with frankenmuscles. I modelled the character, muscles and skeleton in Zbrush and rigged it in Houdini for some quick tests. I have seen that many people are longing for a step by step guide on how to muscle rig a character. I want to use this opportunity to find out myself how this system like the tissue solver works and set out a small guide how to replicate this yourself but for now it's more or less trial and error (geo moving away from rest position and stuff). If you want to contribute and help get this thread get stuffed with pro tips on this topic, i urge you to please do so. Here are some screenshots of the progress so far, as i said the franken muscle is deviating from its original geo position but i'll hope to figure out fast why this happens. I'll make sure to include a basic small setup .hip file for better understanding. (at least for now with my character geo this would be to big)
  16. Hello, I have a rigged character in H 18 and my Groom is not following the characters animation. This only occurs once I have placed a guidegroom modifier in the Groom node. If I bypass the guidegroom the animation works and the hair deforms properly. Of course, without the guidegroom the hair simply stands up and looks incorrect. I have attached a sample file highlighting the problem. How can I fix this? Test_Rig_hair_NoShaders.hiplc
  17. Hey all, I have a simulation of two pieces of vellum cloth I've glued together. After the sim I would like to snap the points together to make sure there aren't any gaps. It looks good on the first frame but once it starts moving the points update and cause a flicker. Is there anyway to snap the points and keep them snapped? Or is there a better way to do this? I've attached a simplified file, the original sim has more points and is more tangled unfortunately. Thanks! Snap_Vellum_Points_01.hiplc
  18. Hi, newbish to Houdini. Stuck on how to apply a vellum animation to another object. I have a mesh that is very high poly with holes, I have taken an earlier version of the mesh before it got detailed and have a basic vellum ballon sim collapsing to the floor. How do I transfer the vellum animation over to the higher detailed model? I thought it would be with pin constraints, forcing the other model to copy the vellum animation, but I can only find information about getting the vellum to follow the other objects animation, not the other way around. Can anyone point me in the direction of what I need? Bex Vellum.hip
  19. Hi everyone, I have a gltf scene which contains a mesh of a rigged character and three different animated poses. I can import the whole scene, but cannot manage to make the character move. Where can i actually find those animations?
  20. Hi guys, I'm wondering how to get the best approch for rotating a bottle on border and then stabilize in a realistic way? rotation slowly and then faster to then stibilyze.. Thank you for your help.
  21. Hello communities, I hope you are well ? And let 3D run on computers !! My concern for the day is quite simple, I am making a layout for a future project. I assure you the movement will be much prettier and better composed thereafter. I impose a limit on doing all of the ship and camera animation in Houdini. Without doing it before in Maya. Currently I use a basic technique which I do not like at all. The simple method of I lock the camera I move in time, I move the camera with the mouse and I key ... Simple but the rendering is not terrible because there are front / rear visually unpleasant. I don't want to put the camera on a spline because it's too linear and soft The Layout test 1 : youtube.com/watch?v=hPxC-DUwXqQ I thought of a draw system with 3 levels one for the translate, one for the rotate, and pivot? Is it achievable? Do you have techniques for me to improve? Thank you very much in advance for your feedback. Nodalception
  22. Hi people, I'm wanting to drop and object as an RBD sim, but have it finish in a specific xyz position and orientation. Basically, I want to drop a bunch of letters and have them form a word. At the moment, they land as I expected they would, but I was wondering if I could 'nudge' them to land in the right place? The realism of the sim isn't too important, but it would be difficult to get the feeling of them falling, if I tried to animate the letters by hand from start to finish. Can I cache the sim and add a value to it, over time, so it ends where I want it to? Can I run the sim and add to the XYZ co-ords as it's running? I could, of course, sim it in Maya or 3ds Max... convert it to keyframes... blend in a final rest pose... and import the Alembic, but I wanted to know if I could do the whole thing in Houdini before reverting to a method I actually know? Thanks
  23. I'm trying to find out how you go about making animated textures so I can have animated thumb marks on my Clay material but can't seem to find any resources on how to do any texture animation whatsoever The effect I'm trying to create: https://www.youtube.com/watch?v=wTu3Xssw67Q&t=19s
  24. Hi, in this tutorial you will learn procedural animation with powerful procedural tools in Houdini. Excellent for Beginner Houdini users, users migrating from other 3D content creation packages (e.g., Blender, 3DMax), anyone interested in Houdini and use it in procedural animation. Download for free: https://artstn.co/m/oJoN WHAT'S INSIDE? 5 Video Chapters (117 min. of tutorial) Houdini Project File INTRODUCTION Chapter 1 Dividing Geometry Into Blocks - 22 min. Chapter 2 Gradual Emergence of Pieces - 15 min. Chapter 3 Procedural Animation of The Crane - 32 min. Chapter 4 Modeling The Crane - 24 min. Chapter 5 Metal Scaffolding - 24 min. TOOLS Houdini 17.5 / 18 MINIMUM REQUIREMENTS Houdini Beginner Download for free: https://artstn.co/m/oJoN
  25. Hi I'm trying in this setup with the Guide Deform SOP but as you can see it really is not working. Please help! Hair Fallout.hiplc