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Found 45 results

  1. 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
  2. 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!
  3. 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
  4. 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
  5. 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
  6. 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.
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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/
  12. Spark + hip file

    Download : https://www.dropbox.com/s/amy4f2smp8qt2m4/Spark - H16.rar?dl=0
  13. 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
  14. 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.
  15. 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
  16. 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)?
  17. 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!
  18. 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
  19. Hey guys quick question: Does anyone know how to get a 'straight' wire from a wire sim when my input object is not straight? Example from the attached image: PIN1 constraints a straight line and PIN2 constraints a bent line, when the sim runs you can see that the input geo shape affects the solved geo. I would like the curved input to behave like the straight one. Thanks!
  20. I am trying to create a simple scene where balloons are tied together to an object using wires.(like in the movie “UP”).. Im having balloons as packed RBD object and the parent point(where balloons are tied) as a separate rbd object. and having wires also into the DOPnetwork as wire object.. Initially I dint simulate the wires but used the wire lines as a constriant network from SOP and made a spring constraint between balloons and parent using the wires as a constraint net, And It worked Perfectly. Now I am turning the wires into wire object and trying to constraint the top of the wire to the balloons and bottom to the parent object, I am having matching @anchor_ids on wires and balloons.. But It doesnt work properly. If someone can explain how to constraint wires with rbd , It will be very helpfull for me.. And if someone already have a scene file for related to this please share it , Thanks a lot in advance..
  21. Hey there, I am currently trying to simulate a (single) falling fir-branch like the ones you can see in this image: I would like to use a wire solver for that, but I am having a hard time to make the needles stick to the branch. How would you go about that? Desired setup: * branch as wire obejct (soft body behavior when colliding) * needles as wire object attached to the branch (soft body behaviour as well) * gravity in place, falling fir-branch, colliding with a ground plane. I tried the "Attach wires to surface" shelftool, but that attaches the selected wire points only to existing points on the branch-geo (which is low res, with just a few points). I would like the needles to be independent of the branch geo so that I can have a rather lowres branch geo (tube, less subdivs), and lots of needles. I would like to attach them like it is possible with folicles in maya, having them stick wherever they are on the surface, not having them stick to one of the input points on the fir branche geo. Using the point attribute "pintoanimation" or "gluetoanimation" also does not work. Doing so, the needles jitter around as soon as they are not in line with a points of the underlying branch geo. Do you guys know any solution for that? Thanks in advance for your time and help! Cheers, Philipp
  22. Unfold Cloth Letters

    Hey guys, I am trying to have a folded letter or object and then unfold it and tangle a bit. I included my scene and i also have a folded position of the letter. I want to achieve an unrolling cloth effect similar to this tutorial for Cinema 4D but using the letter in my scene Thanks in advance, Valentino DENIM_JULY_V01.hip
  23. I am trying to figure out how to spawn new wire geometry within DOPs as it simulates. I create the full wire shape at sop level and I then I animate the deletion of its points backwards, from a couple of points to the full set. Of course just by importing this changing geometry, the wiresolver won't re-import it on on every frame. I looked into combining a SOP solver and tried various approaches, but none worked so far. Deleting points in the sop solver didn't work. Then I tried deleting the primitive, adding or even copy (to aquire all the wire attributes) one point at a time and connecting them all with a new line primitive. But that didn't work either. Any ideas? thank you
  24. Wire constraints to cloth object

    Hi guys I'm not able to figure out how to attach one of my wire object ends to a cloth object. I tried different constraints but none of them accept cloth object as goal object. So can you please look at this file and give me some advice. Thank you sail.hipnc
  25. Hi all, Am trying to tweak a scene file that was passed to me from here (apologies, I don't know/can't find original poster, so can't credit). It's a wire sim where points are activated based on their Y position - And I'm trying to tweak it to be based on color. I've worked a nice way to animate my colour across the points in a way I like, but my question is: How do i get my point color attrib to update per frame in the dopnet? And how do i associate it to the gluetoanimation value? Been really trying to get this going today, but to no avail... Any help or tips gratefully received! activate_sim_based_on_color.hip