Jump to content

Search the Community

Showing results for tags 'wire'.



More search options

  • Search By Tags

    Type tags separated by commas.
  • Search By Author

Content Type


Forums

  • General
    • Lounge/General chat
    • Education
    • Jobs
    • Marketplace
  • Houdini
    • General Houdini Questions
    • Effects
    • Modeling
    • Animation & Rigging
    • Lighting & Rendering
    • Compositing
    • Games
    • Tools (HDA's etc.)
  • Coders Corner
    • HDK : Houdini Development Kit
    • Scripting
    • Shaders
  • Art and Challenges
    • Finished Work
    • Work in Progress
    • VFX Challenge
    • Effects Challenge Archive
  • Systems and Other Applications
    • Other 3d Packages
    • Operating Systems
    • Hardware
    • Pipeline
  • od|force
    • Feedback, Suggestions, Bugs

Found 88 results

  1. Can anyone help me with this file? I would like the wiresolver to properly read the constrained rotation of a static deformed object. you will see in my file its setup and working for a constraint with and rbd object but when I use a static deformed object my rotation calculation is thrown out the window. I've been stuck on this for more then a few days now and still missing the mark. wiresolve.hip
  2. Hi, I'm starting learning houdini and really excited. I'm in still learning phase and searching ideas to do. So here is my problem. I have idea for connect two cables with a cable supported collision and simulation result. question 1: can i generate simulation result on parameter change. (i don't need whole simulation frames just need simulation result) question 2: i need generate cable(between two cables ) "according to grid collision" and "affected with gravity". so i'm newbie and just created with "add" sop and seems really bad. wires.hipnc file attached for review. I need advice and/or guidance. Thanks in advance. wires.hipnc
  3. wires to follow rotation of RBD pin

    Hello! Does anyone have any pointers on how to get my Wire solver object that is pinned to my RBD object to follow the rotation of the RBD object. I have attached the scene file for reference. I'm really stuck on this one. constraints_simple2.hip
  4. Hello everyone ! In order to model a ceiling mobile (such as the ones in a baby's bedroom), I dived in the depth of wire objects, and I feel like it is much less intuitive than the usual DOP workflow. What I want to do is to tie certain objects (in my case, that would be origami birds modelled with the help of the amazing entagma tutorial from last week) to wires, which are tied to a static wooden part. The part where I'm having issues is when it comes to tying together the solid objects (which come as a RBD packed object) to the wires. I've tried several methods, all of which have failed me for now. 1. I tried using the SBD pin constraint from the Wire shelf. It kind of works, but I still find it very hard to control, and it is impossible to simulate the physical behaviour of the whole system (I have to simulate the RBD packed objects separately, and tie the wires afterwards). 2. I tried the more classical RBD approach, using constraint networks. This is the approach I would prefer, since it allows me to simulate the full system. I have set up the constraints using a Connect Adjacent Pieces SOP, which I modified a bit to add the anchor_id attribute on the constraint points. All of my pieces, whether it be the RBD packed object or the wires, come as separate objects with their own unique names matching the name specified in the constraint points. However, when I play the simulation, the constraints do not tie the objects to the wires, and the wires go wild while the RBD packed objects fall due to gravity. 3. I've started looking at Vellum and other cloth simulations, but I'm very new to it and it doesn't seem to integrate very well to RBD workflow which I'm used to. I've attached a hda with my project file, where I've replaced the bird objects with polygon spheres for simplicity. (It still doesn't work when I play it on my computer) If anyone has the time to take a look at it and tell me what I'm doing wrong or put me on another track, I'd be super grateful ! All the best, Nolan Constraint_Wires.hdanc
  5. Rotation in Wirecaptures

    Hi, the wire capture and wire deform are not taking the rotation of the points to rotate the geometry, attaching the sample scene file below, Basically, I'm rotating the curve and deforming the geometry using wire capture and deformer but it's just moving leaving the rotation Thank You wirecapture rotation.hip
  6. Hello, I'm struggling one more time with the rest position. It's something I really have problem to assimilate. So I have my vellum hair simulation. Then I applied a wire to create thickness to my rope. I then applied some UVflatten/layout. And then the UV doesn't stick to my rope. I assume I should use rest for that. But it's an eternal misunderstanding between us. Any help ? Thanks
  7. Proceedual Concrete Rebar

    Hello, I have question. I couldn't understand how to weld the line inside fracture geometry... It often goes through objects. Is there anyway for to do that..? Or anything tips to reach his flow for me? Thank you Concrete_Rebar.hipnc
  8. Wire constraint network Question

    Hi all- Building a procedural constraint network for wires by connecting the interior points in a grid. It works fine for some grid dimensions, but not others, where the sim blows up. shown below a 5x5 and a 6x6 grid. A 15x15 grid will work fine, but a 6x6 one won't. Curious! I'm building zero-length constraints from the interior points and setting the anchor points as follows: int wirepts[] = nearpoints(1,@P,.0001); foreach (int wpt; wirepts) { if(wpt != wirepts[0]) { int pt1 = addpoint(0,v@P); int pt2 = addpoint(0,v@P); setpointattrib(0,"anchor_id",pt1,wirepts[0]); setpointattrib(0,"anchor_id",pt2,wpt); int newprim = addprim(0,"polyline",pt1,pt2); setprimattrib(0,"constraint_name",newprim, "WireGlue"); setprimattrib(0,"constraint_type",newprim, "position"); } } setpointgroup(0,"delete",@ptnum,1,"set"); I delete the original points later - I'm not using the first of the nearpoints to avoid a prim with the same anchor points, I thought that might be the problem, but it didn't seem to matter. Does anybody know the reason why this happens? Am I missing something? Thanks - I'm including a sample file. wireGridConstraints.hiplc
  9. Hi there, I made a scene for simulating a piece of rope with the help of Vellum objects. Although it looks great, I noticed that when I use a polywire sop there is a lot of twist motion that makes the rope behavior unnatural. I posted the scene here so if anyone is kind enough to look at it and give me some suggestion for fixing the rope yaw rotation. thanks in advanced. RopeSimulation.hip
  10. Vellum wire not wrapping right

    I am trying to play with the new Chain SOP and thought it might be cool to do some sims inspired by the example used in the release teaser and I am having some trouble getting Vellum to behave in an expected way. I have a single curve being attached to a cylinder that is spinning on it's axis. The wire should fall under gravity and wrap around the cylinder, but instead it wraps part way around, then holds its stiffness and just gets whipped around. I have had it setup such that the rotation stops after 1.25 rotations and tries to let the rest of the wire drop down, but it just stands there, mostly erect, hanging off the cylinder. Defying all gravity. I have messed around at length with the bend stiffness, going so far as to set it to 0. I have messed around with all of the bend settings. The wire is also stretching by A LOT more than I want it to, but I have gotten some success with the stretch stiffness parameters seeming to work out correctly. What am I missing?
  11. Vellum Frame

    Hey all, I need help with something I think should be relatively easy but cannot figure it out. I want to drop a picture frame in with strings attached using vellum. I have set up the wires but cannot figure out the correct approach to attach to the frame. I have a attached the beginning of my set up maybe someone can help me out or give me some advice! Thanks! vellum_frame_jl_01.hiplc
  12. Vellum hair issue...

    Hello; I would like to spawn some falling wires that fall on a sphere, so I tried to use vellum hair, but the result is not stable as you can see in the image below. So, how can I fix it? Thanks for helping. FallingWires_01.hip
  13. Hopefully this will be simple, but I'm having a hard time finding a solution. I have a simulated vellum string that's pinned to an animated point at one end, while the other end dangles freely. I want to "ignite" the string by having it disappear progressively starting at the free end (I think I already figured this out; All I have to do is animate the First U in the Carve node). However, I'd also like to have a particle emitter travel along the string at the same rate that it disappears, spitting out sparks to enhance the burning effect. How could one achieve this? In case my explanation wasn't clear enough, I drew this picture: And I included my .hip file. LitFuse.hipnc
  14. Heya, For a project i'm trying to build a balloon simulation. For that i need a simulated wire holding down the ballon (rbd or soft body object). I tried looking into multi sovers but i can't get both objects to connect. I heard something about wire glue constraints but most tutorials i found don't try to simulate both together so they can interact. Thank you for your help. BB_0224_Balloon_Sim_00_AS.hipnc
  15. My wire simulation issue...

    Hello; I have some lines in my simple " Wire " DOP, and I want them to act as soft elastic tubes. I don't know why they bend up, instead of bending down! So, how can I fix this? Thanks for helping. WireLines_01.hip
  16. I have a number of wires in a wire solver that I want to connect end to end after simulating for a while (snap together essentially by keying group_broken on), but they are currently joining with a pinched angle, instead of straight on. 1) Does anyone know what determines the angle of the constraint? -With some experimentation, it seems it's not determined by the geometry immediately prior to binding, but rather the relative angles of the wires of the initial geometry. I don't want to align the input geometry, but rather change this constraint angle internally. Image 1 is immediately prior to binding, and image 2 is the bad angled join. If I manually change the input point positions so they're aligned (image 3), then they join straight (image 4). Any suggestions are appreciated! Bonus question: With the wire solver, the restlength of the constraint doesn't seem to be respected, it's always 0. Is this a limitation or am I doing something wrong?
  17. Hi; I attached a grid to last point of my wire object using point wrangle. Now the grid follows that point's position, but how can I force it to follow rotation, too? Thanks for helping. Wire.hip
  18. Hi, I am a beginner level Houdini user and I am trying to accomplish an effect where I grow curves from source points on an object that are dynamic and respond to collisions/forces. An effect similar to this I found some really helpful things on cgwiki (here http://www.tokeru.com/cgwiki/index.php?title=HoudiniDops#Grow_trees_with_particles ) dealing with grains, but I can't figure out how to have my curves grow from my source points while remaining attached. Anyone know a way to accomplish this effect?
  19. Hello fellow magicians, I was wondering if some one could check out my simple constraint setup and see why it is not working? I was adapting my setup based on a wire tutorial by Entagma, and I don't know why but I couldn't get my constraints working. Here is the .hip file. Cheers, Diogo wire_debug.hip
  20. Hi all, Ive recently started looking in to using the wire capture and wire deform SOPs, all is going well however, when deforming on a simple bend i am having to compromise between mesh curvature and stretching Uvs. It seems that toggling between "Align Tangent only" and "Align Tangent with Att Normal" on the wire deform gives me these two different effects. My question is, is there a way to achieve a deformation that effectively smooths out the aligned tangent? (i thought maybe setting my normals as tangent u and smoothing them would help but it has no effect.) Aligned tangent only - Aligned with Att Normal - Thanks all! WireDefromIssue.hip
  21. Hi everyone, I'm working on a little project of mine and I'm using wire solver with SBD spring constraint. I have attribute set up on the points(before the sim), but when I try to feed the strength parameter the expression with that attribute, it acts as if the attribute was zero. The vexpression I use goes like: @theattributementioned * 1000 I've created basic example file of what i mean. The attr “mult” is what I want the strength to be ( for example “@mult * 1000”.) Any input on this would be great Thanks, Hubert wires.hiplc
  22. Hi everyone, Currently i'm running into an issue where my constraints aren't breaking. I spend a while on figuring out why it doesn't work and I still don't have a clue what i'm doing wrong. My setup at the moment is that I have one curve with 3 constraints 1 hard constraint to keep the wire in place. 1 spring constraint that is pulling the wire down (This is a placeholder for collisions later on. It's just there to apply a force for testing). 1 spring constraint without a strength to measure the angle between the tip and a point somewhere on the curve The thing is, when i put them all in one constraint network and break them based on the angle, nothing happens and i couldn't figure out why. But when i put the spring constraint that is pulling the curve, into another network the breaking works! Is there anybody who can explain why this is happening? Why wouldn't it break with all the constraints in 1 network? Is it because i pinned one of the points of that constraint to a wold position instead of a point on the simulation geometry? That's the only thing i can think if that is different than the other constraints. Thanks! break_constraint.hipnc
  23. Simple RBD hanging

    Hey everyone ! I'm miserably failing at making a simple dynamic set up : / I'm trying to hang a RBD object at the end of a rope. I can't get it to work with wire solver and bullet. I've only managed to attach the rbd at then end of the rope, but the attached rbd isn't affecting the rope. And with vellum it works, but I don't want a soft body object. I tried with vellum, thinking I could stiffen the softbody until it looks like a rigid object, but vellum bugs with I reach high stiffness value ! And anyway, I don't know how to replace that softbody by my final object : / If someone could help me back on the correct track, that would be great attched is a hip file with my 2 failing attempts.6ril_RBD-hang++.hipnc
  24. Vellum Hair Break

    I've managed to get the vellum hairs breaking quite nicely - but I wonder what the breakthreshold is compared against in order to determine that it has been reached. Any ideas?
  25. Hi, I like to do this... Create wires (kind of stems) attach the geo to the last point of curves (bloom) and during wire DOP collide the curves (wires) also with the blooms... How to do this? Sees to me like kind of cycles for counting this..? What should be the data flow? Thanks. B.
×