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Found 371 results

  1. I am really puzzled by this. It is a regular flag setup, with the top edge points attached to the collision geometry with some attach to geometry constraints. Whenever my collision geometry moves quickly, the constraints gets stretched even when I set them to be really stiff. Any idea? Thank you
  2. Free video tutorial can be watched at any of these websites: Fendra Fx Vimeo Side Fx Project file can be purchased at Gumroad here: https://gumroad.com/davidtorno?sort=newest
  3. Hi I have a basic scene in which I have animated the rest length of vellum objects using a SOP solver. I then switch from the wrangle back to the 'dop geometry' at a certain frame. What I would really like to do is switch to the 'dop_geometry' when the restlength reaches a certain length. However I'm not sure how to reference this in an expression on the switch. Any help would be very much appreciated. Thanks Restlength_Switch.hipl
  4. Hi, Long time lurker, first time posting. I'm working on something I can't solve without some help. It's an animated piece of vellum cloth (fairly dense) exported as an alembic and I now want to add dynamic sequins (attached with thread/wires) to it. I've tried with wires, copy to points, and following several scales tutorials but nothing is working well enough, so far. I've attached a screenshot of what I have so far and where I want to take it. If anyone has any points, an example .hip, or a tutorial of the sort, I'd love to hear/see them. Also, if anyone wants the alembic, you can find it here: https://we.tl/t-RUyzqkaG08 Thanks! //Tobi
  5. Vellum grains Expanding Issue

    Hi all , I have a sandbox filled with vellum grains. I have the grains settle and then after a few frames part of the grains start to expand slightly. Has anyone experienced this issue of know what could be causing this? Thanks so much!
  6. vellum sin force

    How to add sine force field to vellum? thanks!
  7. Hi - I was creating a simple vellum DOPS network from the shelf tool, and wanted to eliminate the extra SOPS import and do all my work in DOPS using dynamic vellum constraints. However, I noticed when I was doing this that gravity was not working. I am using Set Uniform to Mass = 1.0. However, when looking in the DOPS spreadsheet, it was still zero. I was able to fix it by adding a Geometry Wrangle But this seems like I shouldn't need to do this? Is this a bug or am I misunderstanding how the Mass option works? Thanks for your help, Doug vellum-mass.hiplc
  8. I'm trying to create a 'swarm' of paper following a path, I'm using vellum to simulate it with pin to target constraints, however when I lower the constraint stiffness to get more organic movement, the animation starts to bounce, can anyone advise me on why this is happening? I have no other forces acting on the geo This is the guide animation I'm using as a target - And this is the bouncy sim - Scene file too - paper_swarm_demo_01.hip Thanks Olly
  9. Free video tutorial can be watched at any of these websites: Fendra Fx Vimeo Side Fx Project file can be purchased at Gumroad here: https://gumroad.com/davidtorno?sort=newest
  10. Hello, Noob question here, I have a vellum plane being affected by a popwind force, I don't like the current look of the simulation, how would I change the 'seed' of it to change the results? Thanks!
  11. 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?
  12. Pin to hair with fixed rotation

    Hi, i'm currently in the process of wrapping my head around vellum. I thought i made good progress when this small problem arose. How can i attach something to the tipp of hair without it dangling around during the simulation. Instead of the ball dangling down it should stay oriented tangential to the last segment of the hair (like an antenna). I tried different constraints (weld, stitch, glue) as well as multiple constraint points instead of a single one. What would be the propper way to do this? weld-to-hair.hiplc
  13. Free video tutorial can be watched at any of these websites: Fendra Fx Vimeo Side Fx Project file can be purchased at Gumroad here: https://gumroad.com/davidtorno?sort=newest
  14. Hello guys, I have a vellum DopNet with different vellum sources. I have 1 Vellum object and 2 Vellum sources feeding in the solver. How can I extract the geometry of only one of the 2 vellum sources in a DopImport Sop later one? Cheers
  15. Hello, i need a little help : I have a moving object with a scatter on it to create hair from these points. Theses hairs are stick with "pin points" and "match animation". And I would like to have hair collision with the object. But if I put this object on the collision input, there is a kind of artefact to these roots points. So what could be the solution to avoid this problem that is probably coming from pining AND colliding at the same time. I'd like to keep the pin system (no "attach to geometry"). Any idear ? Thanks
  16. RBD & Vellum Hair interaction

    Hello, I am quite new to Houdini and I've been struggling the last days to get an RBD sim to interact with Vellum Hair wires. The vellum Hairs detect the RBD, but not the other way around. I would love the RBD object to lay on the wires once on the floor, but now the rbd just pushes the wires aside. Also there's some flickering at the hair roots, if any suggestions here very much welcome. Thanks! vellum rbd interact.hiplc
  17. 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
  18. 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
  19. Hello guys, I created a haircut for my character and looked online at how I could get my guides animated. I ended up with the workflow below. My problem now is that I would like to maintain the shape of the haircut. As of now, the guides are all falling under the effect of gravity and end up being straight. Can my problem be solved with the Guide Simulate parameters? Should I create some additional attributes? Thank you!
  20. Hi everyone ! I was wondering if it was possible, on a geometry deformed (by a point deform SOP) to simulate only parts of the geometry that were masked with vellum ? (if needed, I uploaded a scene with the mask I want to simulate). Thanks a lot for the answers ! Vellum_on_mask.hipnc
  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. Vellum Group by creation frame

    I have a vellum sim in a dopnet set to continuous and activation set to $FF%20==1. Which creates a vellum cloth on every 20th frame. How can I set a group to each emitted cloth so i can separate them post sim? thanks in advance for any help.
  23. Hi all, First post, looking forward to engaging more. I'm trying to get an effect with vellum similar to a snake digesting a large meal -- (like egg-eating snakes). Essentially just want to get the mesh to shrink over an object, but need control over the deformation and would eventually animate the object 'moving through the digestive system'. I've tried shrinking the vellum object (swallower) and scaling the interior object but with both ways the mesh not colliding with the object deforms way too much. Anyone have any ideas or quick tips on how to achieve this? Getting a basic shrinkwrap effect is simple, but this one is giving me trouble.
  24. 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
  25. Hello As a Houdini noob i would appreciate any comments or hints on this: How can i apply a force for every balloon pulling against the direction of its string? I'm sorry for the messy setup, i'm still learning a lot. (i wasn't even capable of going the "for each" route to setup the initial state of the geometry...) BalloonTree.hipnc
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