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Found 101 results

  1. Hi I've been working on a personal project to learn some grooming simulation with houdini, but I can't make it work on my animated wolf. The wires just broke when they have to be simulating properly, I've tried a lot of things but nothing seems to work for me. If you know any solution please reply, I will be waiting for any type of information, thanks. hairtest_problem.hipnc lobito.abc
  2. Bake Texture of Hair on a Geometry

    I'm having a hard time getting the "Hair Generate" node of my geometry to be projected in its UV when using the "Bake Texture" node. The error presented is that there was no normals and UV map for OUT_GROOM when I tried with the settings of the image (geometry and hair are inside subnet1). I already tried on a "Geometry" node to use the "Object Merge" to bring the geometry and the hair together, and this works so that at least I can project something on the UV. Still, that way I can't apply a material like the "Hair Shader" to the "Object Merge" of the hair, the hair always stays white. No surface base color is showing.
  3. Vellum hair thickness problem

    Hi, I'm trying to make some thick tubes with vellum hair. Later with redshift i'll render the splines as tubes. So far everything works, but when i specify the thickness of the hair, i realize that the actual collisions are not as thick as i want. If i activate the visualization, they look as they should in the first frame, but as soon i start the simualtion the thickness collision shrinks down, so when i render the splines with my desired thickness, there are intersections. Can you help me with this one? Thanks! They look properly in the first frame They look like this after simulation has started
  4. Hi, I have some issues with Vellum Hair. With the Attach to Geometry constraint I can't found with wich attribut vellum activates the breaking. I would like to break my constraint when my points turn red. I don't want to deactivate the constraint on each point simultanitly. I have try to use a Vex Expression in the Vellum Constraint Property but I can't control the Breakthreshold attribut per points. Do you know any way to do this ? Thanks Hair_vellum_TO_DEBUG.hip
  5. Vellum hair issue on moving geo

    Hey magicians, I'm having some issues adding vellum hair to a moving geo. I tried using hair generate, and a for each loop to pin point 0, but for any reason the hairs go crazy. Simulated mesh also has static points (used point deform), so not sure what is causing this. I also tried scattering points on the animated mesh, but hairgen doesn't work when I select "per point", is this a bug in 18.0.416? I have normals on the points, but nothing appear. I believe I solved similar before using hairgen on scattered points. I also selected "match animation", when is not selected, hairs fall correctly, but when I try to make follow the moving points, constraints seems to go crazy: Any thoughts? Thanks!
  6. 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
  7. I want to use different texture maps one for the tip and another for the Base for my Houdini Hair using Marschner Hair shader and rendering it with Renderman. Could someone like to share how can I do this so that I also have control of fall off?
  8. Hello, I have a rigged character in H 18 and my Groom is not following the characters animation. This only occurs once I have placed a guidegroom modifier in the Groom node. If I bypass the guidegroom the animation works and the hair deforms properly. Of course, without the guidegroom the hair simply stands up and looks incorrect. I have attached a sample file highlighting the problem. How can I fix this? Test_Rig_hair_NoShaders.hiplc
  9. Old school Afro

    Hi, I am new to houdini For some weeks now I have been attempting to use the grooming tools in Houdini. Can someone guide me on how to create an old school afro hair? The hair tool does not seem to create the curls and I cannot get variation as well. I am new with not a lot of knowledge any help would be deeply appreciated.
  10. Howdy folks! I've recently started looking into Vellum and I am currently trying to create interaction/collision between Vellum grains and Vellum Hair however it does not seem to come as easy as interaction between grains and cloth. I've used the same setup that worked with my grains and cloth example to make this setup however as mentioned above so far I've had no luck in making it work. I am sure that there is something very basic that I am missing here but I can't seem to find it. Any ideas? Screenshots of the setup(Sorry for less than optimal/clean node layout): Scene file as well as base model too if you'd rather dig into it. Vellum_Hair_Grain_Test.zip
  11. Hi. I try mixing hair and rbd destruction, but vellum "match animation" makes bad jittering. Here one point of each hair segment set to "Pin points". Disable "match animation" solve this jittering so this moving is caused by that. Every stiffness value and substep can't remove this. "Attach to geometry" makes more bad result. Can anyone solve this problem? Cheers! hair.hiplc
  12. We have shot a new scene for our short film. Unfortunately the hair of our lead actress was longer than we were led to believe. So for continuity we would like to explore the option of trimming it in VFX. She is in a clean close-up throughout with no one behind her and the camera is locked. We would like the hair at the sides to only come down to just before her chin. So about 2 inches trimmed at both sides during this close-up. It is a 30 second conversation. In the two attachments you can see her shorter hair in the scene right before the new one. Her longer hair is the new scene. It is fixed in position so it doesn’t move, which should make it easier to trim. If you have the experience of doing this, please send references and a quote. James Hughes CEO of Sunset Aperture
  13. Dynamic wool...

    Hi, So I have a complex problem that I can't get to the bottom of. I have created trails using volume curl fields. I want it to look like a ball of synthetic down/woollen filling. Now I want this to be dynamic so if it laded on the floor it would have volume but if I use vellum hair it just falls flat because it is just a bunch of curves. Any ideas ? Thanks Andy
  14. Hey Guys! I'm trying to find a way to interact Vellum Grains with curves using Vellum Hair/Cloth. Attached you can find a test scene where you can see an simple example. In this example there is a switch node with three different setups: 1) Hair 2) Grains 3) Cloth My goal is to have both interacting with other, in a mutual setup. But only grains seems to work... But not as I expect, cause I'd like to have a stiffer line behaviour. I know hair can give us this, but how to make them interact? Thanks a lot! Cheers. grains_interaction_test.hiplc
  15. Instance on hair

    I would like to recreate this effect in Houdini that is easy to do in C4D: https://vimeo.com/59735927 [vimeo.com] Is there a way of instancing objects on hair and allowing soft body dynamics? If so, can one randomize the quaternary rotation around the hair?
  16. Hello, I've been having an issue with rendering fur in H18. As you can see in the attached image, the fur is glitching out and is transformed to the origin. There is no issue with the hair in the viewport but the problem comes up in the bucket as well as ipr render. I've tried turning off individual nodes in the hair generate node but no luck. If I create a new hair generate node the problem is fixed and If I revert to a much older saved file the problem is fixed but I'm hoping there is a simpler fix. Any ideas? Thanks.
  17. Hi everyone, I'm trying to bake to texture a bunch of curves running along a surface. I'm wondering if someone can suggest a more effective solution than the rough one I've already figured it out. I basically made a color attribute transfer form the curves to a very high subdivided mesh, but the results I get are not clean at all and because of the very high subdivision level the system is prone to crashing. (Then I obviously proceeded with a bake texture rop). Am I on the right way? How to get smoother and less jagged lines? I attach a hip file (I turned down the subdivision to 3, I ran at 6) and some screenshot. Cheers curves to texture.hip
  18. Helloooo just trying to make it so my hair doesn't have to fall into place every time i start the sim. Thanks!
  19. Baking Hair Textures to Cards

    Hi all I'm trying to bake hair textures to cards I've generated. The built in Houdini baker requires a camera which I don't think is ideal. Saber mentions a technique in this video (at around the 30min mark) where he uses Mantra to sample at every normal to capture the data, but he doesn't show how. Can anyone offer any ideas on how to implement this? Thanks so much!
  20. Hello guys, I am doing a new test with vellum hair. I am trying to sim a sort of object going through some vines and I would like to have a opening like curtain effect but I cannot make the hair react like I would. Feels like they are stretching always no matter what is the value of stretch.. Am I considering something in the wrong way? Any suggestion help would be great thanks test_vines.mov tree_test_v002.hipnc
  21. Hello guys, I am trying to recreate a helicopter landing scene on grass. I am new to Houdini and I was trying to use hair and a radial force to create the effect but not really having much good results. Could someone give me some tips on how to achieve the result? Thanks Luca
  22. Hi I'm trying in this setup with the Guide Deform SOP but as you can see it really is not working. Please help! Hair Fallout.hiplc
  23. Hello Guys! Noob question... I have a character with modeled/sculpted hair, and I want to make it dynamic. The thing is. I´m using a spline for each hair chunk, and the vellum solver to make that spline dynamic. I like the motion I´m getting on the splines, but when I use the wire capture/wire deform combo, The mesh gets flattened. It follows the motion, but it looses all the volume/shape. Is there a way to keep the hair´s shape?? or am I trying to solve this the wrong way?? I hope the images below can show the issue. Thanks in advance! EM
  24. Hi, I was following this tutorial but at around 5:20 he started using green guides to select and move individual guides, which I dont get. Im using 17.5.425. Does anyone know what's the issue or if it is a bug? Thank you
  25. Hair self collisions vellum

    Hi I need to sim groom that needs to be quite stiff, but hair should self collide and layers should stay on top of each other. I can`t seem to make it work. Here`s simple example scene that I`m working on to test it. Any tips of how to make it work are welcome Thanks Janis selfcolision.hip
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