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Found 236 results

  1. Happy Monday, I'm trying to figure out a way to have each line on copy to points grow as the carve animation brings in that point number for the specific copy... I was trying to transfer the attribute with color but then blending was not working very well. Any ideas or thoughts would be super helpful! Thanks in advance. growHelp01.hiplc
  2. Animating a Spring Constraint

    I'm trying to get these two objects to move towards each other after they hit the ground. Blend solvers are being used to allow the objects to transition between their keyframed positions and dynamic states and I need to add an attractive force which is what the spring constraint is supposed to be for. If I plug it in and doing nothing to it outside of hooking up the constrained object and the goal object it works fine. However, I want to control the timing of it so it can work it into an animation. When I tried to keyframe the spring strength or activation parameters the constraint would stop working or not work properly. Result from keyframing the activation parameter. The objects do not pull towards each other, the constraint just keeps them in place. Node network Does anyone know why this is happening? Thanks in advance!
  3. About "3D Animation"

    https://youtu.be/KvpnsLfyB_U
  4. FFF: Subject 071, Teaser

    Thrilled to show a teaser of my future Houdini tutorial. Key topics: - Proceduralism: geometry and animation - Pyro: explosion with love - Karma XPU: pain and joy *99.9% done with Karma XPU Release on gumroad soon.
  5. Hello, I am triggering animation using a mask attribute, converting the mask to a group, and using a copy stamp to offset when animation is triggered. Using this workflow here by the awesome Matt Estela: https://www.sidefx.com/forum/topic/42799/ Everything works and seems great. What I am wondering, is if theres is a more up to date away of going about this that doesn't involve a copy stamp? Or doesn't involve converting my mask to a group? Ive attached a hip for anyone interested. Thanks you bunch of brainiacs! Trigger_Anim_mask.hiplc
  6. I have a dataset that contains animated volumetric smoke density. The dataset is stored as NPZ files (numpy array save file). How can I load the density of a saved smoke simulation as an animated volume to render it ? For context about the float data in the volumes. This is what simulation number 70 snapshot 150 looks like in matplotlib with a viridis color map, but the data in each voxel are simple float64 values. The other snapshops and simulations look similar. This is how you load a single npz file, if you want to try it with the dataset. It just generates a generic numpy float array. So you could just make a tiny numpy array filled with random data yourself for the purpose of testing like this np.random.rand(3,3,3). import numpy as np def npz_to_nparray(filepath): """ loads npz file from location :param filepath: string to file location :return: numpy array """ data = np.load(filepath) data = data[data.files[0]] # normal strange operations to get the the actual array inside data = np.transpose(data, (3, 1, 0, 2)) # turning the inner array layer outside and rightside up return data[0] I have tried: -I can load the npz files in python and in Houdini's python shell as a numpy array. I dont know how to put the data into a Houdini volume or which file format Houdini needs to import it. -I tried to translate the npz files to vdb with the pyopenvdb libary for python. But after multiple days of trying I am unable to import pyopenvdb. I build pyopenvdb library on windows with vcpkg and cmake, but I cannot import the build package. I setup an ubuntu VM and tried importing pyopenvdb there, but I can not import it. tl;dr: How to import animated smoke voxel data that is currently stored as a 4D python array?
  7. Quick Rig Pose Question

    I’ve been attempting to use the motion effects CHOPs for rotation parameters inside a rig pose sop, but every so often the channel reference breaks somehow. This forces me to redo my motion effect. I’m not very familiar with CHOPs, my question is what would be the best way to go about baking the motion effect’s animation to keyframes so I wouldn’t have to bother with chop references breaking? Thanks.
  8. Hello Peeps, does anyone know how to recreate this setup ? I'm really curious to learn
  9. Hey I'm used to Maya, however I'm falling in love with Houdini and I'm trying to slowly integrate it more in my workflow. Currently I'm trying to integrate some fluid-simulations made in Houdini and export it to a maya scene where all the actors and props move at 12 fps (with the camera (and houdini) being 25 fps) Now I'm stuck with a smooth 25 fps animation of the simulation and I have really no idea how you could 'posterize' it or you know let it ignore every second frame. Not sure if this is the right thread, hope I make sense, sorry in advance!
  10. Universal Wipe

    From 04:00 there is a showcase of this tool. a Is there an asset that you can buy that does that? It seems like a really basic tool and I can't believe everyone is supposed to build it for themselves. I searched tool like that here and on orbolt asset store but I can't find something that would match it. The closest thing I found to do that is MOPs Shape Falloff but you have to manually animate it. Is there a version of it where it's automatically animated.
  11. Hi everyone, today we released our diploma short film "Sanity’s Prison". It is an abstract animation film about the conflict between raw urges and morality. The 3D was done completely in Houdini. You're all invited to take a look: Project of the Months: Sanity's Prison by Aleksej Skrypnik
  12. "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!
  13. 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
  14. 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
  15. 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!
  16. 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
  17. 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
  18. 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
  19. 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!
  20. 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
  21. 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
  22. 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.
  23. 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.
  24. 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
  25. 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
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