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Found 72 results

  1. 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
  2. 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?
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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?
  9. 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.
  10. Hi, can't make work the "Wire Visualization" node in H17? Did anyone experience this? Bretislav
  11. Hi, can't make work the "Wire Visualization" node in H17? Did anyone experience this? Bretislav
  12. Ball(clew) of wire

    Hello, there is a task to make a similar ball of wire (the wire fills a limited volume, keeping in turns), ideally animated (show how it roll up) What i want to get: I achieve this result (far from optimal, using popinteract with popnet): As I understand it is necessary to move towards the simulation of the rope.
  13. Wire Solver for ropes

    Hello everyone. I was going to try Wire Solver for some tests similar to the ones that Ben Watts recently posted: https://www.instagram.com/p/Br1uOBqH8wm/ He said that he used Wire Solver for this and the result is amazing. So I started with a simple test: just a line with around 100 subdivisions which should fall to the floor. I used Wire Solver for that but can't get any remotely good results. The rope is self-intersecting and behaving strange. I used the shelf tool to create the setup and changed only the Elasticity parameters in the Material settings for the Wire Object. Set the Angular Spring Constraint to 0 and Damping to 0.001 and ticked on the Self Collide setting as they recommend in the Houdini help for wires or rope. I tried increasing the Substeps in the Wire Solver and in the DOP Network itself without any luck. The rope is still self intersecting. I also watched the M04 | Next Steps | Procedural Animation | Wire Solvers masterclass. But found nothing new ther. And of course I read help of the Houdini where they suggest increasing Substeps to get better results if there are self-intersections. Any help is greatly appreciated. Are there any resources to lean how to achieve the results similar to what Ben has in his test? Or any good tutorials on using Wire Solver for simulating ropes. I can't seem to find anything in Google.
  14. 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
  15. wire solver

    Hello, I have an issue with the wire solve, I have a point that is moving so I group that point, then I applied pin to wire pin to constraint, and or pinto animation, after that the first point goes directly to the center of my scene, does anybody know how Can I solve that ?
  16. Hi there, I am currently doing RnD on an effect that I am trying to achieve that involves cutting a long strip of geo (think of it as a strip of plastic) using another object (blade) I have approached this head-on while learning Houdini and I have learned tremendously just by making mistakes and troubleshooting on the go - I have learned so much and this is the best part of learning Houdini in my opinion. At the moment I have tweaked a basic Houdini wire solver and used a Wire Capture to drive geo using that wire deformation. My question : I would like to know how I can go about cutting this Geo driven by the Wire using another object? The hip file with my tests is attached. Some tips I have found so far is that 1) You cannot fracture a wire instead, use a ConvertLine node (This warps my geo) I would greatly appreciate any help and pointers! Thanks wire_constraint_example_v02.hipnc
  17. Wire solver - rotational constraint

    Hey guys ! This problem has been bugging me for some time now, so here I am ! So I've got a wire that needs to have one end keep its position and the other end to follow a geometry's animation. I specify the face and/or the point to follow. I have the "keep position" figured out, and half of the other figured. I currently have the "following" end correctly follow the geometry, but only in position. I need the wire to follow the orientation of the face of the moving geometry. I managed to do it following one of Houdini's example scene, but it's not applicable in my case. Or I could not figure out how to apply it to my case, so this test is provided with the scene below. See this for a quick glance at the problem. Thanks ! wire_rot_constraint.hip
  18. DOP Wire solver - differents width

    Hi ! First post here, I'm starting Houdini since a few weeks only... I'm wondering how to set different width (for repulsion) for each wire I've created. I've tried to create a random point attribute to drive the width into the wire object but it doesn't seems to work, I feel missing something. Help needed Thanks RANDOM_WIRES_0.1.hip
  19. Hey magicians, Been getting crazy with wire solvers. I think the issue is because I get the points changing over time and the constraints go crazy. I've been reading that I need to create a id attribute with $PT to hold the value, tried that with no luck. Animation works fine until the number changes Any tip will be super helpful, thanks in advance.
  20. Get, set, length of wire via VEX

    Trying to simulate a field of grass with wind. Using wires for each blade of grass. Problem is they elongate slightly when bending. How would you get, set the length of an individual wire via VEX?
  21. Wire tension

    Hello, I have been playing around with the wire solver for a while. But I still have a problem with the wire tension: I have two parts of a wire and a constraint. When I break the constraint the wire should snap back, like an elastic band with a lot of tension. @restlength has no effect and other workarounds don't give me a nice result... no snapping How would you do that? Is there any attribute?
  22. grab wire sim

    Hi all, I need grab wire sim rope in some frame. Wire constraints point to point, so position of the constraint points should be the same with rope's one in that frame. I try to use sop solver to import geometry, isolate needed points and then use position dop to update position of the constraint obj but its doesn't work. I need to do it inside DOP, because manual animation its a hell with sim objects. So I need to dynamically change position of the constraint obj, or create wire constraint, based on sim points of the rope in some frame inside DOP. Is it possible?
  23. Is it possible to use at point group from sop level, to constraint points in a dop (wire sim) with the "SBD Pin Constraint", instead of manually typing in all the points, that has to be "Constrained Points"?
  24. Wire capture weigth

    Hi all. I've a difficult wires with big and intersection elements. I can't to set working preferences and think that wires capture weigth should be controled by spline attrib but how can I set it? Sorry for English I'm from cold Russia.
  25. How to attach the rbd to wire?

    Hi guys! I had a misunderstanding about relationship of rbd - wire objects. I'm trying to attach rbd to the wire by hard constraint and this gives the result of a one-way rbd effect on the wire. Maybe if we need attach the wire to wall or to electric poles this is will work but what if there is a situation where we need mutual influence on each other, for example Christmas lights, rope ladder or necklace. What constraints we need to use for this? I found the example https://vimeo.com/31314814 but I did not understand how it can be used for several objects. I prepared the simple scene where one sphere should be hang on the wire. How can we do it? Thank you! rbd-wire_constraint.hipnc
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