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Found 36 results

  1. Deform Groom curve stretching

    Hi Odforcers, Im working on a project where I have to tear up a lawn using bullet rbd's and hair to generate grass. Ive come into a problem, or maybe a bug where the grass in the deforming rbd patches becomes very long either when moving through space, or even at rest. I cant seem to find any other topic where this has happened before. Has anybody encountered this kind of problem with H16's hair and deform groom? Any incite would be appreciated. Id love to attach a screen shot however the content is under NDA. All I can say is imagine a bunch of curves spidering out from underneath a few selected skin patches. Cheers!
  2. Hi all, I am attempting to render out hair curves and only have them generate at the time of render. As I understand it, setting the hairgen node (created from a fresh scene from the shelf on a rubber toy object) render parameter to Hair Generation = "Generate Geometry in Mantra" is supposed to do just that. If I switch that parameter to "Use SOP Geometry", the hair renders out fine, but that defeats the purpose of not writing out the geometry beforehand and thus bloating the size of my IFDs. Otherwise none of the hair renders. Has anyone seen this happen or know what needs to be changed in the scene? Is this a bug? This is using HoudiniFX, v16.0.619 I cannot supply my scene file, nor screenshots, but this is happening in both my actual scene file and in a fresh launch of houdini with simple geometry as the only geo in the scene.
  3. Hello all, I wanted to share a Houdini OTL asset I've made and am testing out for the beta release: "https://www.psynema.com/houdini-procedural-hair-cards-game-meshes/" The link above is the documentation and download links (available on Orbolt) The asset takes Houdini's Hair system, then procedurally makes a low poly hair card for each hair clump, so your hair generate nodes will need a hairclump node within to initialize a clumpid attribute. Simply plug your hair generate node into the asset and the left output will give you a low poly hair card wig and the right output gives you a high poly mesh that's exportable. (Houdini's hair system is actually NOT geometry that's exportable to other software, so the asset takes care of converting it). MORE IMPORTANTLY - the asset procedurally creates a GROUP NAME for each hair card that MATCHES its high poly hair clump. That's important because Substance Designer can take that information and BAKE EACH HAIR CARD SEPARATELY without interference from other hairs belonging to other cards, something Houdini has yet to implement, a "match by mesh name" feature. Let me know what you all think as I'd like to build upon the asset. Thanks, Gary
  4. Hi All, I am not sure I am posting this in the correct Forum segment..if note please let me know. For the life of me I cannot find a way to replace/control the hair shapes from ribbon to cubes or hexagons and etc..... Trying to achieve in the images below using Hair and Fur as it is much faster than using the Copy stamp Sop. I have tried Polywire (super slow) and I was using the Hair shelve tools. So created a Geometry Node with object merge using the output of the Hairs ====> Polywire. Any suggestions would be great The below is the result achieved so far....super fast performance Cheers!
  5. Hi FX friends, In previous versions of Houdini the hair/fur tools gave you the ability to generate guard hairs and white hairs, however with the new toolset I can't seem to find how to generate these hairs. I've searched through all shelf tools, guide/hair generation SOP's, the Houdini 16 hair masterclass and the Houdini 16 documentation to no avail. Perhaps there's a new workflow using creative grouping of guide hairs and throwing them into a whitehair/guardhair attribute I'm not aware of? The new Hair shader seems ready and willing to pick up such attributes so I'm really scratching my head here. Any help and direction would be greatly appreciated! Thanks!
  6. Two questions about hair: 1) I'm trying to get a "helmet hair" look, i.e. a hairdo that has been "pushed" closer to the scalp. I can always modify the guide curves by manipulating them as SOP curves, but I'm wondering if there's an dedicated groom (either tool or process) that would push an existing hairdo closer to the scalp. Or should I perhaps start with guide hairs that are already near-tangent to the scalp and try to create the "helmet hair" look from there? 2) While working on the problem above, I often get hair penetrating the scalp. Is there any setting in the groom tools that would force hair to always stay outside of the scalp (without doing simulations)?
  7. Houdini 16 hair parting

    Hello, Does anyone know how to use a guidepartition sop in the new hair tools? It seems to do pretty much nothing visually by itself. I managed to use the partdir attribute to set a direction of the guides with the guideprocess sop, transfering this attrubite to the skin at first. But maybe there's a right way of using the guidepartition? Thanks.
  8. Hello,I have 2 questions about the hair:1. When I paint the density attribute the hair guides are reacting based on the vertices, i.e. when I hit only a vertex guides disappear (or appear). It means that with low polygon count I can't avoid stepped guides boundary. But with more subdivisions it is practically impossible to work due to long cooktime after each brush stroke… How can I deal with the guides between the vertices without increasing subdivision? Attachment below describes it.2. To delete hair guides (for example, for hairline or beardline on the head) I use Length Adjust shelf tool with Target Length value of 0.001 (complete 0 is impossible), but this still leaves hairs roots as dots when rendered. Is there a cleaner way to delete the hair neatly along the boundary?
  9. Styling Hair generate

    Hi, I have a haircut that is quite precise, so i am using a guide groom on the hair generate to cut a straight line on my characters fringe. How do i have this work with the animated result? Thanks
  10. Simulating Fur/Hair

    Hi all, I have a question about simulating hair in Houdini. In maya, they have settings that can be mapped to the different positions along the hair strand. You control it via a ramp. For instance, stiffness curve. You can adjust the ramp so that the root is stiff, but the end tips of the hair is loose. Is there a way of controlling attributes like this in houdini? I want the roots to be stiff and only the tips to be loose. Thanks
  11. Hair Collisions

    Hi guys, I have a hair sim that im trying to do, i've got everything setup and working with the exception of collisions with other objects. The hair will collide with the skin surface, but im trying to add collisions with his clothing. I've created an external dopnet and merged in a static object (his coat). I've verified that the collision guide is accurate but i can't get it to collide with the hair wire object. Collide Independent and Collide Codependent are enabled on the wire object. Any help would be gratefully appreciated Thanks
  12. I'm having trouble with mantra rending hair with houdini16. I keep getting an error message. [17:06:10] mantra: Unable to resolve geometry op:/obj/geo1_deform/OUT_GROOM. Please ensure the object is included for rendering. You can turn off vm_renderable if needed. Invalid detail specified Invalid detail specified Invalid detail specified I don't know how to turn off vm_renderable or what is causing mantra to fail here. Is this a bug? any help much appreciated B
  13. Hi all, new to this forum, I'm posting something I tried to get help in other forums with no much luck. Maybe here someone has some info about it. Thanks in advance.I'm starting to use Houdini migrating from Maya. Along with a ton of questions and things to learn, I'm looking for help on how to pass the skin UVs into a fur system, using the Arnold Hair shader. There is a UV tab with U Parameter and V Parameter to call, but I couldn't figure out what to get there. I've seen a few tutorials doing so in Mantra which look straight forward, but not in Arnold for me.Thanks
  14. Animal Logic (Sydney) are looking for experienced Houdini Character Fx Artist and TD's Applicants can apply here: http://www.animallogic.com/Careers/Jobs (Sydney -> Senior Character FX TDs – Peter Rabbit) We are seeking High Mid + Senior Character Fx positions Basic Details/Requirements: Artists will be Responsible for the generation of shot-based, skin, hair, feathers and cloth within Houdini. Production experience in television commercials, film or animated features A very good understanding of Houdini, ideally specialised in the following sub disciplines Cloth solvers (Houdini's own solver or Carbon cloth plugin) Wire/Hair solvers (DOP and SOP workflows) Vex/Python scripting Skin deformation techniques Creation of Digital assets thanks for looking Miles
  15. H16 - Hair Dynamics fields

    Hi, Is it possible in H16 to use an external field to affect the Hair Guide dynamics? Like for example a Vortex Force. Tks Cheers!
  16. Houdini FX artist specializing with hair and curves generations is needed for on-site contractor work in the Silicon Valley / Los Angeles area. Must have the ability to work within a VRay/Maya pipeline and create, rig and control intricate patterns like below: https://vimeo.com/59736707 Please send demo reel and examples to: joelangmuir@gmail.com and I will forward to my manager and recruiting.
  17. Looking for some help on setting up a Wrangle that would curl a curve by rotating the last point in the curve around a point centered on the previous point, and doing that all the way down the chain so you get nice curls happening. Been trying to work this out but I'm missing some knowledge here when it comes to looping through points per primitive, and also I'm not sure how to rotate a point with the rotation origin starting on another point. Basic idea is that given an @N and an @up vector on the curve, it will rotate each point about the previous point's @P using cross(@N, @up) as a rotation axis, by some user defined degrees/rads number. The code would have to (far as I'm thinking so far) loop through all prims, and then loop through all points in each prim, rotating each one around the previous point.
  18. Hi guys, I need to export some hair as alembic but it's not as easy as it looks like. I think it need to be converted to geometry first. Do you guys have any idea on how to proceed?
  19. Any tutorials on animal fur?

    Hi, I have seen this lion fur in vimeo and would really like to know how to do something similar,how to achieve that level. There is a tutorial from cmiVFX with a lion as well but you will see the huge difference in result, I need something of this level: Thank you
  20. Hi, "Paint length" and "paint bend" for FUR is not on the shelf in Houdini 15.5 (Hair shelf, Grooming shelf). Is there a new way of doing paint length, especially shortening the length with the paint? And how do I paint the bend for the fur in Houdini 15.5? Thank you
  21. Houdini hair problem

    Hi everyone I just recently started playing around with Houdini hair after finishing a very difficult job done with Yeti. I am trying to assess houdini hair as a possible new solution for hair and fur. But I have one small issue that I cant find any solutions for it: Basically after setting up the fur for the model (I am using the Add Fur tool from the shelf) everything is fine and I can use the different attributes like length and bend to adjust the overall look, But as soon as I groom the fur using one of the shelf tools like "length adjust" or "cut hair" I cant tweak the overall attributes like length or bend etc anymore and it seems like after grooming the hair using any of these tools I lose the ability to adjust the overall attributes. I was wondering if this is probably a bug in hair tool? I have attached my test scene as well. I would appreciate any helps. Thanks in advance! Sina fur_pipe_test_01_v01_t05.hip
  22. Hello my Houdini Folks, I hope you guys are doing well and creating A class Sims. I am tasked with creating Houdini fur for a talking animal, We are replacing the mouth with the animated one on the live action puppet. So basically my task is to match the groom with the plate. We first were looking at the Xgen Approach given its in Maya and we can render from Maya itself. But because Xgen is a pain and very buggy i transferred the task to be done in Houdini and rendered out in Mantra. I have the groom which looks if not the same, close to the puppet. But now the issue is to transfer the same fur over multiple shots with different camera info for continuity sake. I exported the camera and animating geo in Houdini. But with each shot, the geo is at different location in space because each shot is tracked separately. For transferring the fur over accurately, the geo needs to be in close proximity, with slight change in positions. I tried the recache strokes and transfer based on UV approach. But still, to get the groom match accurately it has to have same position as the fur geo we are transferring from. Did anyone in the community have worked with Houdini fur and transported the fur over multiple shots with different camera and geo positions? Any input will be appreciated. Thanks Harsh
  23. Hair and Beard Character WIP

    Wanted to start learning more about the Hair and Grooming tools inside Houdini 15 this week. I really like the controls that Houdini has when painting density, frizz, clumping and width maps. I learned a lot from @abvfx and his vimeo videos https://abvfx.wordpress.com/. A problem that I have yet to solve is creating different size clumping on the head hair. I want to have smaller clumps on the side and back of the hair. Then have larger clumps for the top of the hair. I tried painting different clumping density values to vary the clumping. There is probably a way in the Clump Tab within the Fur Node that I am missing. The head hair, beard and eyebrows are separate Fur Nodes which gave me better control over the hair. I am not sure how much of a performance hit this will give me when I animate the character. The model came from one of our character artists, Aaron Gutierrez.
  24. Our new GridMarkets Houdini artist feature profiles Charles Trippe, FX Lead at Zero VFX. He shares his thoughts on a hair simulation system he developed, which can be seen in action in commercials and films such as Kia: Evolved, and the upcoming Ghostbusters movie. We hope you enjoy the feature! Patricia and the GridMarkets team
  25. wool

    I want to create a ball of yarn, this is what I tried; create a sphere, apply fur but I can't figure out how to get the thickness and get it to wrap around with layers upon layers, if I recall, Houdini has strands could that be another option ? If so how do you access strands, there was no nodes called strands ?
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