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Found 52 results

  1. 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?
  2. 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?
  3. 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"?
  4. 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.
  5. 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
  6. Wire constrained to two objects

    Hi! Having some problem here with wires eheh. I'm struggling for some time now to achieve something that first seemed so simple, but i'm really lost now! I'm animating an old style phone, with a cable quite rigid, and i just want to constrain one end to the phone (animated) and the other end to the base (fixed). I have it half working, but i can't figure out how to keep the cable semi-rigid... It just "break" were the wire points are constrained. And want the cable to "leave" the base nearly rigid, then deform, and be rigid again when joining the phone... Keeping the base and phone's orientations... (hope it makes sense, sorry for my english) I've search a lot, read and downloaded examples from tokeru wiki, tested all the constraints, but i must be missing something important... It works perfectly with gluetoanimation when one end is contrained and the other is free, but as soon as i try to make the base's end to be also constrained, it doesn't works... Does anyone have some kind of directions? (You can see in the attached video that the base is "breaking" while the other end seems good...) tel_cable.mp4
  7. Hi! Ok here is the thing, I understand almost everything about the file BUT there is a thing that is driving me crazy and is happening in the "SOP Solver" inside the DOP Network, there is a merging sop using the constraints from the previous frame and adding new ones that are created by the distance between the points of the wires, the weird thing is that there is no accumulation of constraints happening, what I expected from this merging is that the constraints number will increase over time but for some reason they are deleted and recalculated in the next frame. So I tried a few thing with the file and found that if I "by pass" the wrangle node that animates the "pin" constraints things go as I expected (constraints accumulate over time and the for that reason the sim slowdown) WHY!! Even if didn't bypass the node and only change the range in the fit operation calculated in the wrangle from (... 1,0) to (... 0,0) making it "0" all the time killing the animation the sim work as before and deletes the constraints (no accumulation) but if I delete the whole fit operation and replace it with a value of "0" directly the expected accumulation goes on (you can check this if you run the sim being inside the SOP Solver). So maybe someone can help me to understand why this is happening, I think the Accumulation of Constraints prims is the correct behavior (at least is what I expected) but the sim runs smoothly if the constraints dissapear so... WHY Here is the example File (I modified it a little bit: Geo name and a red sticky next to the node you want to bypass) HOUDINI NC 16.5 Wire_constraint_network_v02_modified.hipnc
  8. Wire Solver Wind

    Hello all, does anyone have any tips on applying nice looking ambient wind to wire objects? I have several wires constrained together in a way that is working well, but I'm having a hard time getting any good looking wind to give them ambient movement. I've tried the wind force several times, but can't seem to figure out how to get good results from it. Thanks!
  9. Saliva Effect with wire solver

    Hi, I am trying to create some kind of saliva effect from a creature's roar when it opens its mouth, something like this. I researched for quite a bit and understood that this can be done with the wire solver. However, I'm getting stuck at getting the constraints to work!! I created a line and made it wire object. Then, I use glue-wire-to-animation from the shelf tab to constrain the line to my model. I want to constrain the 2 end points of the line to the animated object. I can see the constrain but it is not moving with the animation. I'm not sure what I did wrong and how to fix this. I don't really understand constraint network since it's my first time working with it. Can someone please help? How do I constrain my wire object to an animated object? I also thought of scattering points of my model and use the add node to first create the saliva. But what I don't understand is then how do I define so that the points on attach from top to bottom rather than left to right. Any advice on this? Here is a reference video. What I would like to achieve is something very similar to this at 0.09s. https://www.markinglevfx.com/projects/6477328. Here's another one but the description was too brief that I still don't understand how does it go from wire to pop for dynamic and meshing. Thanks, Eunice
  10. Hi, ODfellows! This is my first post. I'm glad to in the company of experts. I'm hoping some kind soul can help stop my accelerating hair-loss. So... I'm trying to tie a basic shoelace style knot. I've made groups for the ends of my wire to make "aglets" (the bits on the end of shoelaces), but I'm having trouble guiding them around. Am I missing something obvious? Thanks! Slideshow Blob
  11. I'm pretty new to Houdini and I'm not sure whats the best way to approach this effect. Right now I have a thin cylinder I am using for the string and I converted it to organic tissue in the shelf. then I have a big soft body that I also converted to organic tissue, and placed it on a rotating platform. All of that works great and looks nice when it deforms. But I'm not sure how to attach the rope to the soft body so that it will begin to wrap around it. I tried using a SBD spring and that had no effect. Then I tried using the Stich cloth tool from the shelf. That worked great in "hard" mode, but the two soft bodies stopped colliding. Then I tried constraining the rope to a rigid body, and the constraining that to the bog soft body, it worked but the rigid body kept dragging everything around randomly. I attached my scene of what I have so far. Thanks! rope.hip
  12. Hi! How do I make instances of deformable geometry with deformer (wire, lattice, …) on the surface of the animated object? I want to do, for example "hair" with a custom geometry, or algae. They should be copied in the animated surface to have minimal memory usage.
  13. Plant Dynamics

    Hi there! I'm tasked to do a simulation of a guy, walking through some plants. So I need to make some motion on the plants, as they're waving in the wind, but also collide with the character. My initial though was either Soft Body or Wire sim, however I can't get it to play. If anybody got any good suggestions, please let me know! Unfortunately I cannot share anything. Cheers, Jonas
  14. Hi! I'm wondering how to control the width of the wire captures envelope, per point preferably. I've read the documentation but I don't really understand it: Does this mean that we cant use any type of attributes to drive the capture radius? I would have hoped it would be as easy as with the poly wire sop, where we just create a width attrib and point to that in the sop, but that does not seem to work for me. Regards, Martin
  15. Hi .. I am trying to follow along with a tutorial that goes over wire constraints and pins. I cant get it to work properly. If anyone has any brilliant ideas ... let me know. here is a hip ... wires_3.hip
  16. Hi .. I am trying to follow along with a tutorial that goes over wire constraints and pins. I cant get it to work properly. If anyone has any brilliant ideas ... let me know. here is a hip ... wires_3.hip
  17. https://www.hossamfx.org/trees-rigging-in-houdini/ Hello Everyone : this tutorial is about creating and animating trees in Houdini FX in Procedural way . you will learn how to create your own tree model and how to animate it in different weather like windy day, normal wind ........etc. also you will see how to simulate a growing process : what i mean in growing is : you can select at which age of tree you want to start growing to final complete model , so you can start growing from zero or you can grow from winter tree to a beautiful spring tree with leaves and young branches . i will show you firstly how to create a tree model in SpeedTree software for about 1 hour and then move to Houdini and create python code to define the hierarchy of branches and build a procedural wire dynamic network with some math concepts of course . Houdini rigging tools and chops techniques in our list also to add more option and realistic to animation . in the link you can find more description about this tutorial . More info Here: https://www.hossamfx.org/trees-rigging-in-houdini/
  18. Spark + hip file

    Download : https://www.dropbox.com/s/amy4f2smp8qt2m4/Spark - H16.rar?dl=0
  19. Hey guys, Im playing with the Wire solver and I managed to get a series of wires from one plane to another to dangle (mostly using the shelf tools). What I would like to do is to start with just a couple of wires and over time increase the number. As you can see in my scene file the number of wires is determined by the scatter nodes... but if I animate the points count there the simulation breaks. Any idea ? thanks! mj_wires.hip
  20. 2D dynamics

    What's the best way to simulate dynamics with just 2D shapes? Is it possible to use any of the existing solvers to simulate rigid bodies, but also flexible curve/polygonal shapes that respect line to line collisions ? I've tried using the wire and the grain solver (with rest length on a network of lines that connect the points), but the collisions only happen on the point level, resulting in penetrations between shapes. Is there anything else I should look into, or a working example I can take a look? thanks a lot georgios
  21. Hey. I have a problem with overwriting values from wire object in SOP Solver. If klinear parameter (Linear Spring Constant) is set to 300 in wire object and then I'm writing inside sopsolver in point wrangle @klinear = 300; just for test, then my simulation looks different, less stabile (?). Why is that happening? This is the same value so it should be the same sim. I was trying to put sopsolver before and after the wire solver and there was the same situation.
  22. Hi everyone, I am still working on a shot where trees bend due to a rocket exhaust. I have tried FEM but I think it will not do what I want (too 'chunky'). I would like to try the Wire solver. What I want is the trunk of the tree to bend very slightly, the branches to bend a bit more and the twigs to bend a twitch a lot - bend angle proportional to branch thickness, basically. How can I vary the wire deformer strength or bend angle along the length of the L-System branches? I suspect this is a VERY simple thing for a Houdini TD to do, but I am not sure how to approach it. Please help! I enclose a simple setup where I have a L-system, converted into a Wire sim, with a hard pin constraint on the base of the trunk and I made a Wind force pushing on it. Many thanks l-system_wire_test_02.hip
  23. Hi! I have a strange issue. When I write many files at the same time, some of them breaks. It can be 200-300 files simultaneously size of about 10 Mb, or 70-80 files of 100 Mb - I have the same result: files exists, but 5-10% raise read error in Houdini. They have a normal size or less than normal on the storage. I tried this on the old storage and on the newest storage (with perfect access time, speed, caching etc) - the same result. Houdini 16 behaves just like Houdini 15.5. When I starting write this files, we have write errors on the storage from other software like Nuke or just write files from the OS. Another picture is not observed: when we write hundreds exrs from nuke - there is no file breaks on the storage. This occurs for many months, and I think the reason is in the method of writing files from Houdini. Is there a technology to change the method of writing geometry from Houdini (flags, variables)?
  24. Spaghetti like effect?

    Hey magicians, I just saw a great animation by Diego Diapolo and there were some effects that blow my mind, I wonder how can they be achieved, is this wire solver? or can be made within pops?, also the green thing, is fem? any tips will be very appreciated here are some gifs: http://i.imgur.com/ResVXoy.gifv http://i.imgur.com/h92G1CR.gifv http://i.imgur.com/HGn8i0U.gifv And here is the entire animation (great one): Thanks in advance Cheers!
  25. Wires on Particles?

    Hi everyone, I'm trying to use the points created by a particle sim, and copy lines to them, then solve them as wires. However, so far I can get nothing to work at all. Nothing ever shows up the in viewport, I don't know why. I have tried using one dop network to create the particles, and another to solve the wires, but this doesn't work. I suspect it's something to do with the fact that the newly created geometry needs to be imported into the DOP network, but I do not know how to do this. Any advice would really be appreciated. Wires_on_Particles.hipnc
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