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Found 225 results

  1. "Vellum Reference Frame" node usage

    Hello, I've been researching for a while, perusing for a while, and experimenting for a while with Houdini at home. I've been trying to use vellum cloth on a character that is animated, not just with his limb motions but also his location and rotation (center of mass moving about). Sometimes I want the vellum to work with that, say, if he does a flip over a barrel, but if I'm just trying to move him into position (say, stage right) from his starting T pose, I'd really like for the vellum to ignore that positional movement and just use his local joint movement as he settles into an idle/rest pose. I've been given to understand that the Vellum Reference Frame node might be useful for that sort of thing, but the official documentation is short on what values in the data channels would actually suffice, and I'm not sure where to wire it into the vellum node flow. I've been assuming after the Vellum Solver, but I'm not sure on that, and simulations are taking forever to test simple iterative experiments. Do any of you have experience with the Vellum Reference Frame in this sort of context, and have recommendations on how it might be used? Thank you!
  2. My Crowds agents are glitching

    Hello magicians, I've been having this problem for a while. I've been experimenting a lot with crowds and today I feel I've hit a brick wall. So the problem is rather simple but seems very complicated to me. Long story short, my crowds have glitches for some reason and they don't loop. With Mixamo animation I feel like they are skipping a frame or something but I can see that the motion is not fluid, like they get stuck one frame. I have prepared a scene for you, a scene with a situation where the glitch is very obvious. If you open the scene and check out the "Crowds" node, above frame 200 everyone just loses their walk cycle and starts again from another point. In the same scene, I added my broken Mocapbiped 2 which literally snaps at one point and is not a loop. I just added it to the scene from the shelf and it's not looped. Isn't it suppose to loop? I feel like it should loop, and I messed something up. Why would you have a run cycle that's not looped. I feel like I messed something up but everytime I try to start a new crowd setup, tried all the tutorial and for me it's acting up. With a mixamo walk cycle, I see the agent being looped correctly but when I start making my crowd it skips a frame. It's been bugging me for a while and I think you magicians can have a better guess than I do. It's also annoying because the problem is not consistent. In the attached scene it heavily glitches, but with mixamo fbx it's barely visible but it's there. My guess is that the framerate is not synced with the animation's framerate. Somewhere I have to set up my agent's animation, but I don't see a control for this anywhere. I'm not necessarily a noob, I've been using it since h15, and the most simple problems humbles me every day. Also I have no one near me using Houdini... Thanks in advance. Crowd Setup Not Looping.hiplc
  3. Hi Odforce, So I have made an animation from this organic looking structure and would like to import it into the Unreal Engine 4.25 . I found out that fbx does not support vertex animation. Apparently animation created in houdini for example with noise is vertex animation. Therefore I had it exported it as an alembic but the file was insanely large ( ~700mb). Other forums about alembic mentions alembic in houdini saves everything. I have tried to exclude anything except from the attributes, P, N and still around the same file save. With this journey I stumbled about VAT. Vertex Animation Textures and couldn't find a fitting tutorial that would cover this SOP with the same setting layout. The questions are: 1: how do I use VAT to export animations out of houdini and import them into UE4. 2: Are there other ways to export animations and import them into UE4? Screenshot and file are below Thanks in advance. Organic roof growth.hip
  4. Hello, I'm a beginner and I'm working on a growing plant using a Lsystem. I made an animation that I exported to alembic for each leaf unfolding, but I don't know how to restart it at each Lsystem generation, so the leaf unfolds from the beginning every time. Only the first one unfolds as I wanted, logically. In the attached files you can see my node trees, the first one for the leaf animation, and the second one for the whole plant. I made a screenshot of how the animation is supposed to look on each leaf and how it currently looks. Thank you in advance for your help!
  5. Hey guys, new to kinefx. I added a skeleton to the upper part of a body geometry, corrected some of the bad deformations and especially straightened the fingers, works great. However, I don't get how I can set this pose as the new rest pose in order to export it properly or even re-target an animation using that pose. What am I missing here? Thanks, Christian
  6. Hi, I wonder if it is possible to trigger an animation on an event. Let's say I have a sphere, I simulate it falling on the ground just using a Dopnet and a ground plane as a static object. And let's say I want to play an animation each time the sphere touch the ground, like waves on some water. How can I do it ? I've heard of RBD Impact Analysis, but I can't find how to use the generated points for something like it ? Can someone help me ? And can I have an example file ? I link an example of wave that I want to trigger when the sphere touch the ground Sound_Wave_v001.hip
  7. Hi, I have some geo with point animation (such as animating the surface with a point VOP, or alternatively using a mountain SOP). I want to be able to export this to an FBX (or other format) for playback in Unity. When I export FBX, the animation will import fine back into Houdini, but Unity is not showing any animation, and from my research thus far it seems that I cannot export point animation to Unity, only object level stuff which seems quite limiting. (See Olivers post here: https://www.sidefx.com/forum/topic/76189/) Does anybody know what the best way is to do this? Thanks
  8. Flame attachment and render problem

    Hello community, I am doing a SpaceX starship rocket landing on an extended ocean (flip sim integrated), right now I am working on the rocket exhaust which should interact with the flip simulation. 1. I have created the pyro simulation of the exhaust flame and now I want to add this pyro flame sim to the rocket model where the exhaust should be. 2. I have done a point expression for the pyro cache, it has worked out. BUT now, when I want to render it, the flame is staying on the grid and isn't on the rocket. I hope you understand a bit about my idea. Here is a screenshot with the problem. here is the hip file with the 3d modell https://drive.google.com/drive/folders/1Q_c7VAu4qidMzSdMLl7IBvPs3VeqTlMi?usp=sharing I would really appreciate help, because I have set a deadline for my own and I want to reach it!
  9. Hey All, I'm looking to create a stroke on effect with multiple lines offset in time. I found a thread here that showed a technique for offsetting animated points in a foreach loop but I wasn't able to get it working with my current set up. I believe it's because the point number is changing due to the carve sop but admittedly I don't have very much experience building something like this. Attached is a file, I'd really appreciate any help or advice. Thanks! Line_StrokeOn_v01.hiplc
  10. Free video tutorial can be watched at any of these websites: Fendra Fx Vimeo SideFx Project file can be purchased at Gumroad here: https://gumroad.com/davidtorno?sort=newest
  11. Hi, I'm having this issue where (I think) the hairgen is scattering along the density attribute I made with an attribute paint, causing each strand to move randomly on a deforming mesh imported with an alembic file. Any solution for this? *(SOLVED) - it seems that with an obj sequence, the guide deform works correctly and doesn't make the any unnecessary scattering towards the hairgen density area, but i'm forced to use a guide sim for the simulation, if anyone find a way to bring the guide deform into a vellum dop i'll appreciate it.
  12. Hi there! I want to do a procedural animation where I randomly change the transformation every second or so. For example at frame 1 posX is 0, stands still and at frame 50 it moves to a random pos within 10 frames, pauses for 50 frames and moves to next random pos within 10 frames, pauses for 50 frames, moves to next random pos and so on. Unfortunately my knowledge of CHOPs is rather limited and I couldn't figure out how to do it with expressions based on @Time. Any ideas? Cheers, J.
  13. Hi everyone, I'm trying to transfer my guides from a geometry to another one which is located somewhere else in the world space and it works with the guide transfer through uv's matching. The Vellum Sop works fine during the few frames where the second mesh stays still in t-pose, but once it starts the animation, every guide created from the hairgen starts flipping around. I tried to reimport the mesh as an fbx, alembic cache, obj sequence, but nothing actually worked at all, so I decided to make a sphere and made the same process and it worked fine. I don't actually know if it's a problem related to the skin of the rig or I should try another method, maybe through the dop network. Tried on a different file with only this mesh imported and even without the guide transfer it has the same problem. Might need some help for this one, because is causing me headaches. I'll leave the hip file with the alembic mesh if anyone wants to try and solve this for me. Thank you in advance. alem_10_fenrir.abc pr_fr_v005.hip
  14. Hi everyone, I have a plant (leaf and stem) merged as one piece of geo with some dynamic animation. I'd like to animate the leaf separately and still be able to keep the current animation. Is there anyway you guys can think of that I could do this in a procedural way? any suggestions would be much appreciated. Even if you have suggestion on how I could do it differently from scratch that would be appreciated too. See attached file. Thanks in advance. philodendron_model_03_for_forum.hip
  15. Shape Key Question

    Hi there, I’m importing a rigged Character Creator 3 model into Houdini using the fbxcharacterimport node in Kinefx. The model has shape keys used to control facial expressions. In the geometry spreadsheet, these are showing up as primitive attributes. However, when I select the Rig Pose node, these each become detail attributes. My question is, how can I go about accessing these attributes, and using sliders on them to animate them in Kinefx? Or do I need to use chops in some way?
  16. I am working with animation layers, and get this color in my parameter all the time, what does this color mean?
  17. So I recently stumbled onto the Motion Path Handles Tool which allows you to visualize your animation curves in 3d space and also edit your keyframes in 3d space as well. I absolutely love this feature but from what i've read and experimented with it only seems you can get this Motion Path Handle UI tool at the OBJ level as it requires you to have the Pose mode selected on the left hand side of the Viewport. I was hoping someone could help me find a way to use this Motion Path Handle tool at the SOP level for a kineFX rig on say a rig pose node or something. If nothing like this exists at the SOPs level yet maybe we could brainstorm a way to either get something similar working at SOPs level, or how to procedurally import joints up to the OBJ level to be controlled with Nulls and therefor could use the Pose tool and the Motion Path Handle animation UI at OBJ level still. Motion Path Handles: https://www.sidefx.com/docs/houdini/basics/motionpath.html
  18. hi everyone, i want to animate a camera, for now lets say i have two keyframes. and i want to have an arc in the motion + independently change the velocity of movement (i,e. so it doesn't affect the arc). anyone has any tips, on how could i do that so i am have most control? many thanks in advance d.
  19. 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
  20. 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
  21. 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
  22. 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.
  23. 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
  24. 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
  25. 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
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