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Found 176 results

  1. Vellum Pin to Target with gravity

    Hey gang, I've run into a problem I can't get my head around. I have a Vellum cloth sim with a Pin to target constraint. I want the cloth sim to follow the target while also being effected by gravity and can't resolve making both the target cloth sim and gravity occur at the same time. Any insight would be MASSIVE help! Thanks. Hip is attached. Vel_pin_target_gravity.hiplc
  2. Vellum cloth

    Hello everyone. I'm experimenting with vellum cloth. But the character has tremors in his arm. What could be the reason for this? Thank you for your help in advance. Subs 5 Cons Iterations 500 test_vellum.mov
  3. Greetings! I'm trying to attach a vellum sim to a pop sim... The idea is that I first do a pop advection sim then attach vellum cloth to that so they collide and interact with each other... It's almost there, with one slight issue. It seems that vellum is calculating the particle point for every frame and I need it to calculate only the newer emitted (birthed) points... Is there a way to tell it to do so or is there a cleaner setup to achieve what I want? Attached is a simple test scene of where I'm at. Any help, guidance, or advice would be greatly appreciated! vellumParticleTest01.hiplc THANKS
  4. Hi! Im trying to update the stiffnes of my pin to target constraint inside of a vellum contraint property , but when it updates it doesnt updates with the paint attibute im using to scale by the stiffness. Is there a way to do this inside the vex option on the vellum constraint property?
  5. vellum cloth self-intersection

    Hi guys! Justa quick question. Im trying to achieve this kind of effect: Very thin plastic plane (has to be thin besause of tiny wrinkles) on animated skeleton. BUT unfortunately it doesnt work quite well, bcs there are so many self-intersections, and also intersections between the dancing skeleton and plastic plane itself eventhough I set the substep to 10.... :/ can anyone help me to solve this issue, please? THX so much Here u go the hip. dance.hip
  6. Hi All, Struggling with my Vellum sim. Have a relatively simple sim that is some fabric suspended on wires. Hair constraint handles the wires, applied to wire Group, pinned to static elements Cloth constraint handles the fabric, applied to mesh Group, no pinned geo Glue constraint applied to all geo Edge length scale parameter on my geo is quite small / shouldn't cause issues Any advice on why my sim kinda works but doesn't keep points at the end of the wire and mesh in the same position? Thanks
  7. OpenCL Exception: clEnqueueNDRangeKernel (-52). This is probably due to incorrect number of kernel parametrs. I'm getting this error on each iteration when I try to use a Vellum on a sphere. I'm just trying to make a basic balloon, and am using the Vellum Configure Balloon preset from the tab menu. Essentially following the Entagma tutorial for the initial setups then deviating once I get it inflating how I want. At least, that is the goal. As it stands, that error just keeps looping until my Houdini crashes when I try to simulate. I have already choked down my cache size and have the latest nVidia drivers for my GeForce 1080. I can't find much info online and none of them have resolutions.
  8. Rendering cloth on both sides

    Hi guys. I have a quastion 1) how to render cloth on both side? Do i need to use something like polyextrude? 2) Im rendering cloth on extremely high angles of the normals and thats why cloth become white. How to fix this?
  9. Hello. This is my first time asking I think it's a long stretch because of the orange part, but I don't know how to solve it plz help me
  10. Hello, I would like my drapped cloth to be a bit more pulled towards the bottom when I am simulating and not have it fly upwards too much. see screenshot. I just want the shape to stay a bit more consistent. I know that the arms are pulling the cloth up at some point, but I am sure I can cheat my way out of this!!! I created a @massgradient with a wrangle using the bounding box of my cloth. This feed into my vellumcloth>vellumDrape>DOPnet. So this attribute should be 1 at the bottom and near 0 at the top. How can I multiply mass by this attribute in the DOP? Is this even how I should do this? I tried using a Pop Property inside DOP, setting mass to 10, and in the VEXpression, typing @mass*=@massgradient; But this doesn't seem to do anything, and when I bump the mass to 100, it gets really weird and doesn't do what I would imagine. Any Ideas? If the cloth had a lower resolution, I wouldn't have this problem, but I want to keep this wrinkled look. Thank you very much
  11. Dynamics Tendrils Anemone

    Hi Houdini Magiciens Anyone know how i can do that ? I know how made tendril /anemone with hair but i don't find the way to made collisions like in this vidéo. It seems like cloth. Thanks a lot for your help !
  12. Membrane tearing

    Hi gang ! Here is my latest vellum file, I played around with noises and constraints. My goal was to emulate a membrane tearing, much like a burning film: You can download the hipfile and play around with it tearing_share.hip
  13. Vellum Cloth Stitching Has Jagged Edges

    Hi Guys, I have been working on a cloth simulation in vellum where im making a pattern using a curve and then using those curves to dictate where the cloth will be split up into separate pieces using an edge fracture. Im then trying to have all of these pieces stitch together to make one whole connected piece of cloth that is made up of all of those pieces that were cut out. I intend to texture all of the separate pieces individually so currently i am using the piece attribute created from the edge fracture and then have converted that to groups to later be used in c4d to texture. The problem i am running into is that the edge fracture is making all of my intended seams jagged. I feel like the edge fracture probably isnt the right way to go about doing this as it seems that its more geared towards RBD and destruction but havent been able to find a solution. I would also be curious what the best way of stitching all of the pieces together would be? I am using a vellum stitch constraint at the moment but also struggled to be able to get the seams of the pieces I had cut out to stitch to its respective piece. Below is the render as it currently is, you can see all of those jagged edges. Im still quite new to houdini so any advice or knowledge you guys have would be greatly appreciated. I have attached my scene file below if anyone wanted to have a look. PS. This is my first post on the forum so if this is in the wrong spot please let me know. Cloth_Experiment_01_v08.hiplc
  14. Hey there, I'm currently trying to get a trampoline effect in Houdini. My current set up is using a grid as the trampoline, and I have a sphere falling onto the trampoline with a mass of 15 all in a vellum cloth set-up. Solver has 10 substeps. I get a small initial bounce, then it loses all bounce after that. I've tried increasing substeps, messing with the trampoline cloth stiffness and bend, lowering the rest length, etc. I can't seem to get a stronger bounce than what I have now. I'd love to maintain the first bounces "bounciness" with all the following bounces. Any help would be very appreciated! Scene file attached and test vid attached. Trampoline_v001.hiplc Trampoline_v003.mp4
  15. Hi, I have a vellum cloth sim in which I need to have a cloth stick to a geometry as a starting position for my simulation. My simulation is basically a stick that falls off of a product but so far I am having trouble getting it to start as if it were sticking on the surface (which is not flat). Any tips on how to achieve that are more than welcome. Thanks.
  16. Vellum Collision Problems

    Hello! I am trying to deepen my understansing of vellum by building the solver netowork myself. I have hit is very enfuriating sustuation were my character litterally walks out of her pants. When I use the sop based solver this dosn't happen. I am sure I am missing something but it seems most things I have tried are giving me the same result. I am using an almebic cache for the collider, and cloth geometry brought in from Marvelios Designer. I am using an collision source node to generate a vdb for collisions, and using a staticObject set to “Use Volume Collision” and “Volume Sample” for division Method. Here is what I am getting
  17. Curling peel

    hey guys, how are you? i'd love to know a way to do this technique, I already know how to do the tear, but I can't curly every piece like that. anyone know how to do this? https://vimeo.com/396578224
  18. Houdini Instructor

    short contract (3 months) Houdini Instructor. *must have work visa or legal right to work in Italy (work visa will not be provided)* - 4-7 experience specialized in high quality FX, demonstrated through a showreel - Well versed in the operation of Houdini and can easily relay the fundamentals on how to use and create in Houdini - excellent communication skills with both students and colleagues - rounded understanding of VFX industry and VFX pipeline - pro-active learner and problem solver - strong organizational and time management skills - previous teaching experience is preferred
  19. sliced ribbon cloth effect .

    Hi , is there any guide or starting point to achieve this kind of effect in houdini like this tyflow example ? https://www.instagram.com/p/Bm8nHNfApwE/?utm_source=ig_web_copy_link the confusing part for me not the sim itself , it's how he slice the geo in a continues sliced way ? any input is really appreciated ?
  20. Vellum Cloth and Grain Interaction

    Hello all, I'm attempting to combine vellum cloth and grains on the sop level but a few things look strange. When I merge them before the solver (like I've done in the past with multiple pieces of cloth) it looks like the grains add little square boxes onto the cloth mesh. I'm guessing these are the grain constraints but I'm not sure. Also, when I run the sim the grains stay above the cloth, never actually colliding with it. I assume the two things are related but I haven't been able to sort it out. Does anyone have any ideas? Thanks in advance. Vellum_ClothandGrain_01.hiplc
  21. Hi all, I'm going crazy trying to figure out what I thought was a simple and common problem to solve. I'm creating a walk-cycle of a man covered in flapping rectangles of paper. I'm scattering 1500 points over a mocap biped in a t-pose, interpolating the points on the animated version of the biped, creating a planar patch, defining pins, copying the planar patches to points, and then doing a cloth simulation with vellum (with biped and self collision). This all works just as suspected - awesome. The problem is, when I copy the planar patches to points they intersect with each other and they intersect with the biped on the first frame and stay like that as a result. I've tried a for each point loop with intersection analysis to remove planar patches that intersect but it would calculate on each frame (as opposed to only the first frame as I'd like) and was a big mess. I'm a novice and don't know what to do having spent a whole day trying to research/experiment. Please advise me on how to resolve this - would really appreciate it.
  22. Vellum Cloth Collision

    Hi everybody. I have a cloth rack with hangers and clothes on it. The rack moves along the path. I simulated and cached the hangers moving with the rack. Then I modeled and draped the clothes on a static hanger and copied the draped clothes to each hanger to simulate the clothes on the moving hangers. I thought instead of using static deformed object it is better to use RBD fractured object (making it inactive) with point position, translating the transform of the hangers, so it would not load the collision geometry every frame. To help the vellum follow the animation of the hangers I also soft pinned with match animation those parts of clothes that "touch" the hangers. The problem is, after a couple of frames, the clothes start to penetrate the hangers. Increasing the substeps (tested with 10 and 20 substeps), collision passes, polish, post collision passes doesn't solve the problem. So generally I have 2 questions, first is: which collision type is used in vellum simulations: Bullet or Volume? And second: any thoughts on how can i solve my problem? Loading hangers through static deformed objects also dramatically increases calculation time.. Or is it the only option for vellum? Thanks in advance!
  23. Vellum Cloth with various materials

    Like the bag simulation in the Houdini 17 o'clock video, I try to make the clothes have the effect of other materials such as iron and leather. No matter how hard I look at the parts where iron and clothing are simulated, there is no example of this, so is there any part that I can refer to?
  24. Natural Wind Movement on Vellum Cloth

    Hello all, I'm looking to create a wind force that flows through vellum cloth in one direction. I feel like I'm getting close with offset on a pop force but it seems like the wind is moving the cloth uniformly all at once and I can't figure out how to fix that. I've attached a reference of the flowing cloth I'm trying to create and a hip of where I'm at. Any help would be greatly appreciated! videoplayback2.mp4 Simple_FlagWind_01.hiplc
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