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Found 24 results

  1. How Does Vellum Physical Parameters Works ?

    Hi everyone, I'm trying to simulate paper using vellum and I can't get the friction and drag right. I kind of got the result I wanted, though I still don't understand those values. By "those values", I mean static and dynamic friction and normal and tangent drag. I'm a really visual person and there's no example or graph that show's how this works on the Houdini documentation, so I thought that maybe one of you would be able to explain it to me ? Thank you.
  2. Glue RBD on Vellum

    Hey guys, is there way to do this? I have to rip an envelope and it have that wax sealing it. It rips just where the wax is. The wax doesn't break but it have to influence the vellum in some way. Anyway, just a simple test with RBD and Vellum interacting would be awesome. Thx
  3. Vellum loop?

    Hey magicians, I was requested to create some cloth in motion assets, I'm working with vellum, but having troubles to loop it as client requested. So far I used a blend shapes with first and end frame at the end, but the loop is quite noticeable since it reverses the blend at the end to start again. Here's a sample of the asset I need to loop: Here's another idea I had, I'm going to test it now: 1) Having the initial frame with cloth shape 2) Group the edges of that 3) Pin constraint the edges to vellum 4) Animate the edges having first and last frame in same state Any tips to loop vellum? Thanks!
  4. Hi friends, i'm trying to wrap a piece of cloth around a gun geometry using vellum, i've tried to use the weapon part as Collider and a cylinder in the other side of the piece of cloth and animate the cylinder around the weapon, but in a moment the cloth detach from cylinder, have an easy way to do that with precision and quality? Thanks! Felipe Marceu
  5. Vellum grain (particles awake by collider)

    Hello, guys! I'm new in houdini. There is a simple question: how to activate particles using a moving collision object in vellum solver? When I activate the Enable Auto Sleep (inside the Vellum Solver), the collision disappears. I tried to add a popcollisiondetect in vellumsolver/dopnet/forces, and somehow connect Cd from there with the attribute doautosleep (from Sleeping) but nothing happened. http://prntscr.com/lqbfyr And one more question: why the popcollisiondetect invert my colliders in the space (blue spheres)? http://prntscr.com/lqbi76 I would be grateful for any advice
  6. Vellum cloth floating?

    Hey magicians, I'm trying to achieve a similar vellum sim like this, haven't installed H17 yet since I use Marvelous for cloth but this one will be hard on MD, any thoughts on how to approach this with vellum? Here's the reference: Thanks!
  7. Greetings all, I'm working on a shot where I have a spinning falling cloth. In order to control it I have the center of the Vellum cloth attach to an animated object. It was working fine for a while, but somewhere when I iterated my .hip file up, the constraints started to be generated off center. I tried to match the settings from the previous correct one and even copied the properly functioning nodes over, but it was still misbehaving. I attached a photo of what it should look like vs what's going wrong. Even stranger is that in the attached .hips, there's a rogue switch node that if I delete it, the constraints won't form at all. It happens in both the correct and wrong versions. The switch node isn't even connected to anything in the stream of data as far as I can discern. The .hips are reduced from the larger shot I'm working on and the switch is a leftover from removing the collision geo after a certain point. For the moment I'm going to back step to the working .hip, but I was wondering if I'm missing a setting or this is just a bug. I have a hunch this might be an issue with using Vellum in a SOP context, but I'm not certain. Using Houdini Apprentice 17.0.352 on Windows 10. Thanks! haveahapyday_vellumConstraintIssue-correct.hipnc haveahapyday_vellumConstraintIssue-wrong.hipnc
  8. wacky waving inflatable man

    hey! I didn't have the chance to look into h17 and vellum yet, and I'm looking into a way of simming the wacky waving inflatable man, like the one in the ref. any idea or advice? is it achievable with vellum? I've seen objects inflating/deflating but this has some complex dynamic I'm not sure about
  9. Mass in General

    Hi people, I'm trying out Vellum in Houdini and I was wondering how mass works. I noticed that the mass is a point attribute. That said, if I want to know the total mass of the object, do I need calculate the sum of all the points ? Thank you.
  10. Greetings! I'm working on a shot where I'm using a sphere to push a cloth through a hole in another object. Up to a point, the sphere acting as a collision object works great. However, the cloth slips off the sphere halfway through the sim. I was hoping I could animate an "Attach to Geometry" Vellum constraint to ensure the cloth sticks to the sphere after a certain period of time. I can't seem to figure out how to animate any constraint properties though. I'm doing it at the sop level using Houdini Apprentice 17.0.352, if that makes a difference. I tried making a simple scene with a grid and sphere through vellum constraints. The idea was to let the grid fall to the ground and animate the stiffness value on an "Attach to Geometry" to pick it back off the ground, but it doesn't work. I also tried the "Attach Frame" setting on the "Attach to Geometry" constraint, but that doesn't seem to do the trick either. Are Vellum properties set at the beginning of the sim and unable to be changed? Or is there some secret sauce I need to add? Do I need to do this in a DOP network or change values upstream in a wrangle? I can't seem to find anything but beginner Vellum materials online at the moment. Thanks! haveahapyday_vellum_animatedPropertiesTest.hipnc haveahapyday_vellum_clothHole.hipnc EDIT: Solved! Check Noobini's responses in this thread.
  11. Hello everyone, I am doing some balloons within vellum. For the upwards movement I am using inverse gravity. For the constraints I am using both cloth and strut constraints. Added some wind for realistic animation... So far everything is going fine, but this whole setup left me with a couple of questions: -When using double constraints, what does vellum assume to be the leading properties when both nodes have overlapping constraints and parameters like bend, stretch, mass, drag? -Is there any way to control mass via attributes on the original meshes? Or is there any other way around ?
  12. Hey, I'm trying to get this stick to points constraint to update every frame so I can have this cloth sort of peel down over time. Thought setting 'create constraints' to 'each frame' would make it work but doesn't work. Also tested using a value instead of an attribute which also doesn't work. Any pointers greatly appreciated. Attribute_Val_Cd.hipnc
  13. vellum hair break [SOLVED]

    Hi, exploring vellum i'm trying to break an hair geo by enabling the "break threshold" option in the "vellum constraint" SOP. I must be missing something on the constraint workflow of vellum because it has no effect at all on the sim :'( I'd be curious to know if any of you managed it ! Thanks vellum_hair_break.hipnc
  14. Vellum Grains problem

    Hey everyone I have a little problem with vellum I could use some help with. I need have a part of the "subject" bloat up and increase in volume to the point where it pops and liquids come out. Trouble is, I cant really get this to behave properly. Most of the time it will stretch the geo too far and not actually tear, even when the break tolerance is like .01. I don't know if I'm doing something wrong with grains or what but they seem finnicky. Also, is there a way to have an active area for the sim to run, like how in an rbd sim you can isolate out an area? I'm using a really hacky way of separating the active and non-active area with which I'm not too happy with.I'm still relatively new to houdini so I feel like I'm missing something obvious. For reference of the effect I'm going for, look up Thunder from Big trouble in little china. Bloat_building_v020.hiplc
  15. Hello all, I've seem to run into a weird problem on my most recent project. One of my objects doesn't render, with a material or without. Yes it's in my force objects, yes it's a polygon mesh(unless vellum does something weird that I didn't know about). I tried switching the shader from the generic to another material but it doesn't matter. It will render my other polygon object, the ripples, and even the smoke sim later on in the sequence. But it won't render the ball, nomatter what I do. I'm using 17 just incase in matters. This is literally the last step of my project and I can't wait to see it done, but this silly thing has to get fixed first. Thanks for your help.
  16. Vellum Cloth and String weld

    Hi guys, I'm playing around with vellum but something is bothering me: I want to attach a string to a cloth but I cannot do it if they are 2 different vellum objects in DOPs The example file will be much clearer than what I write but the question is: Does all the vellum objects need to be merged to build a constraint network, am I using the wrong method meaning I should create the constraints in another way ? Thanks for you help ! cloth_and_string_01.hipnc
  17. Vellum Balloon Pressure

    Hello there! After a few hours of playing with the Vellum Balloon object, I'm still trying to figure out how to recreate the effect hat was presented in the H17 Sneak Peek video (the one with the Rubber Toy inflating and being crushed). So far, I haven't been able to produce anything like that effect; playing with the pressure constraints doesn't really had the expected effect, and I'm quite surprised the solution isn't a little more straightforward. If any of you has any tips for achieving the Sneak Peek kind of inflating effect, I'll appreciate it. Thanks!
  18. Animated Mesh on Vellum

    Hey guys, is ti possible to put an animated mesh, with changing point count, on Vellum? This is what I need to simulate: Scene file is attached RnD_Embroidering_v202_odforce.hip
  19. Hi, I'm trying to recreate GuidedWrinkling example with Vellum system. I followed the Tetrahedral softbodies example described in Vellum basics docs Then, added Vellum Constraint at the beginning of the chain and set the type to 'Pin to Target'. So the chain looks like this: Tetrahedral | Point Deform SOP (animation) | Vellum Constraint (Pin to Target) | Vellum Constraint (Distance Along Edges) | Vellum Constraint (Tetrahedral) | Vellum Solver It kiiiiinda works but I'd like to match the behavior to the Hybrid object. The main parameters to recreate are: * Shell Shape Stiffness * Shell Bend Stiffness * Solid Volume Stiffness Should I be creating a separate Vellum Constraint for 'surface_triangles' group? ideas? thanks

    Anyone tried already combining those 2? like pouring water on hair or on cloth? I tried using multisolver to connect pop solver with emitter and pop fluid in vellum DOP, but doesn`t really want to work.

    Anyone builded a vortex force for vellum? or maybe had a idea how to? thanks Tim

    Anyone know how to solve this? I get this in the console : opencl exception cl create program with source
  23. Vellum animated constraints

    Has anyone had any luck breaking constraints in vellum with animated attributes? I have set up a simple scene the constraint breaks fine using a non animated attribute but if you go outside the dop and plug the BREAK null into the animated colour the constraint fails to break, I've tried breaking it with some simple vex and had a play around with the vellumconstraintproperty node to but not having much luck. on a side note has anyone been having a problems with the new visualizer tools in 17? should be able to click on a attribute in info tab and it will show the attribute in the view-port, seems to be throwing a error. Thanks. string_release.hip
  24. Hello, I'm relatively new to Houdini. Just playing around with Vellum, which is amazing, and can't quite figure out how to get an object to stick to another. In the demo video you see the rubber toy stick to a spider web- this is the basic gist of what I'm trying to do. Is it the Glue constraint I should be using? Any help much appreciated!