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Found 77 results

  1. 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
  2. Hi, Anyone knows a good way to deform groom using sim curves? as guidegroom deform doesn`t seem to work for me and pointdeform has some other issues. Do I really have to sim low res curves and then apply hairgen for full res? Problem is that i have my groom done already and want to sim approx 10% of curves and only the long ones and deform my groom by those curves. Obviously I can`t acces Furtility, so is there any other good way using Houdini to do it? Thanks Here is the simple example of what I`m talking about: groomDeform.hip
  3. Hair initial state

    Hi everyone, im new to houdini but have a question as i really cant seem to find the answer anywhere. I was wondering how you would keep a groom once you have added simulation to it? As in how do you stop the groom from just flopping down with gravity? Is there a way that the simulation will try keep the groom ? hope this makes sense. Thanks in advance.
  4. Our company (Synthesis AI) is interested in working with freelance "Houdini Grooming Artists" for an ongoing project. Candidates should show their skills through work samples from previously completed projects (demo reel, still renders). Please let me know if you or anyone in your network is interested: ali@synthesis.ai Regards -Ali
  5. Hi, How could I measure vector distance to another surface like you see here. Not just closest point distance, but distance following the vector. I would like to use this as length point attribute in hairgen to control the shape of groom with geo. Cheers Janis Vector_length.hip
  6. Hair Guide Transfer Issues

    Hey guys, I'm still fairly new to Houdini and I am trying to make a hair sim for a character on a short film I'm on. I have created my groom on a static mesh of the character and I want to transfer it to the animated mesh. I've imported an alembic cache from Maya, matched topologies with the static mesh, cached that matched mesh out, then brought it back in. I want to transfer the guides to this newly cached mesh, but when I use the guide transfer node, it creates multiple instances of my groom and scatters them around the space. I have also tried the vellum constraint option "attach to geometry" with only the root points selected, hoping the rest of the curves will follow but only the root points moved. Not only that, but they didn't spread across the mesh to their correct position. At this point, I'm not really sure what to do anymore. Any recommendations are welcome. I can attach the file too but I'm not sure if that would be much use since you would need the cache files too.
  7. Vellum - Breaking / Shedding Hair

    Hello everyone, I've a project where i want to simulate some hair with vellum. The hair should break and fall to the ground over time but i can't get it to work properly. As you can see in my simple example, the breaking is working for the guide hair just fine but resulting in a misbehavior when it comes to hairgeneration itself. The vellum sim is somehow not correctly transferred, resulting in the hair just dissolving... I tried a vellum hair sim without the breaking before and it is just working fine, so i really don't know where the error comes from. I attached a simple example of what i tried; any help is much appreciated Test_Vellum_Groom_simple_hair_drop.hiplc
  8. Animated noise on guides or hair

    I just got into fur and hair in 17.5 and I'm wondering how would I go about having guides or hair animated with some noise on direction or bend with each guide as seed. I'm not looking to simulate hair as I have many characters with the same fur and simulating would be too much. Ideally I would like to have each character with a different seed offset on the noise (I have a for loop and deforming the original guides on sop level using groomfetch etc) but maybe that's me getting ahead of myself. The guide process nodes don't seem to have an option for animating with noise so please let me know if you know if and how that would be possible. Thank you.
  9. Hey guys, Could anyone explain me why hair and fur shelftool creates two additional objects (guide groom and hair generate objects) instead of putting everything inside the original geo object? I was able to recreate everything in the original geo object, and everything works fine. Such workflow seems for me more, at least visually, obvious for me. I have to admit that i m not big fan of shelftool, and i prefer to make everything by myself in network panel. However as i m still learning houdini, i use shelftool sometimes to understand the workflow, so i can recreate in future in the network panel from scratch. So my question is what is the idea behind creating separate objects? Do i miss something by creating everything from scratch and putting all nodes in the original geo object, like some additional settings on the object level itself? I could not find the answer to this question, so maybe you could shed light on this subject. Thanks in advance
  10. I have used this setup on a number of projects and thought I would share. Basically, it is a simple setup that uses the wire deformer and hair system to animate geometry. I used to do this all the time back in Maya using Shave and a haircut, and was surprised that there isn't a more straightforward method to do this kind of effect in Houdini. This is especially useful when you need to add flowers or other kinds of detailed grass to an existing grassy field that has wind blowing through it. grass_example.hip
  11. Hi! I'm trying to figure out how to add a glittery effect to houdini mantra hair. Would I have to build that into the hair shader? If so could anyone giv eme a quick rundown on how to start doing that? The effect I'm going for is like you dipped your hair in glitter water. So the end result is a very sparkly hair. Also I would like to adjust the color of the glitter. Edit: Also I'm generally finding it hard to find a good explanation for how to start adjusting/bulding your own materials.
  12. Hey guys, I have a question about rendering and baking AOVs with Mantra. From the extra image planes I managed to render out LPE planes such as beauty, direct diffuse, indirect diffuse, direct glossy reflections, and glossy transmission for a hair groom. They turn out great. The problem is when I try to bake those same image planes from the hair groom onto cards. The LPE image planes come out black. If I try render any of the other image planes like root to tip color, hairID, transparency, diffuse unlit color or any other custom passes, those come out great, but all the LPE passes don't render. I suspect this has to do with the absence of a single camera point, so specular reflections, transmission, and other camera dependent BSDF functions don't produce anything. Is there a way around this? Is there a way I can feed a fake camera/eye point in space to the hair shader and then bake that lighting on a card? In a way to create a static fake incidence angle that references a camera I am not actually rendering through? I am also experiencing problems setting up ambient occlusion to be baked from the hair onto cards, a tip on that would be most wellcome. I am using the bake texture ROP. any feedback would be most appreciated, cheers
  13. Vellum Hair Stiffness Falloff

    Hi, I'm working on some hair simulation for a groom setup using the grooming tools. I've been trying to get a stiffness falloff working so that the hairs are very stiff at the root, but become less so at the tip of the hairs, but haven't been able to get anything that works yet. Ideally I'd like to be able to put a ramp gradient along the guide curves that can then be multiplied against the bend and stretch stiffness values. Is this an approach that could work? Or should I be trying to adjust the constraints instead? I've attached a sample scene using a sphere with a gradient multiplier along the curves that I'm trying to get to work. any insights would be very appreciated! furStiffness.hip
  14. Hair Gen issue

    Hey there, I'm trying to simulate hair, that works so far. But if I try to use the hairgen they always disappear after a few frames. The strange thing is that they only disappear if I'm caching the Simulation and load it from disk. If I'm not loading from disk everything works just fine. Hope somebody can help
  15. Adrian Meyer's Cell Split Hair

    Has anyone done Adrian Meyer's cell Replication tut & been sucessful adding the hair? I've tried a few ways but can only get the hair to work on one side of the split. https://vimeo.com/329020210 Thanks guys
  16. houdini feather tool test

    a feather tool developped by me. 4ba291d06056c28ade186ba4186a5de2.mp4
  17. Vellum tangled office blinds

    Hi there, This is a bit out there but I'm trying to remake this effect produced in cinema4d using Vellum: The blinds were simulated then looped and baked to an alembic, then I attached the strings to the edges simulated them, making them loop using a pose morph tag. I was wondering if there is a way to do this in Vellum all at once having the strings effect the movement of the blinds, with the whole thing being a seamless loop. Basic starting point for vellum would be a simple flag I know, but does anyone know any tutorials that would cover attaching multiple cloths together with vellum hairs? Many thanks, H
  18. Wiggling Fur

    Hi all, I created a vellum fur simulation for my chimpanzee that simulates the guides perfectly. But when I render, the actual fur, especially the longer hairs, are wiggling like crazy. It is especially noticeable thanks to the white hairs I have. As far as I know, I have no wind forces activated. I've looked around and tried many different renders with different sim parameters but the same always happens. If anyone could take a look I'd be grateful. I'm attaching the project with some renders so you can see the problem. I deleted things like textures and sim cache to keep the file size smaller, creating the cache is quite quick anyway. If anyone has any questions about the setup just let me know. Thanks in advance ~Tomas
  19. 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?
  20. Hi everyone, my name is Tomás and I'm new to the forum. I'm creating a fur sim for a chimpanzee using the Guide Simulate node with the Vellum solver. The chimpanzee will later be animated. The sim works fine but I can't find a way to make it keep its wild messy look. The guides do keep their shape (bend, guideinit, etc) because I increased the constraint iterations and the bend stiffness. But I can't find a way to make the hairs keep their direction. In other words, once the gravity affects the guides they all go too down. So I want a way to keep the original shape of the hair a bit more. I could tone down gravity or the mass of the guides but that would make it look as if it's underwater or something once I animate the chimpanzee. Increasing the constraint iterations to a ridiculous value would maybe fix this but at a high cost to sim time, same for stubsteps. Increasing Bend Stiffness to billions and billions doesn't seem to help either. Obviously, I don't want the hair to be hard as rock. I want it to behave this way because it's light, strong and covered in dust and sweat, if that makes sense. It's also important to note I committed the noobie mistake of not resizing my mesh after exporting from Maya which works with different centimeters instead of meters. Meaning my monkey was more than 100 meters tall. I believe I already fixed this by going to preferences>Hip file options but I did this after creating the simulation so I'm not entirely sure if everything was resized correctly. Attached are 5 images: the guides at frame 1, the guides at frame 73 (3 seconds into the sim), a render of the fur at frame 1 (the way I like it), a render of the fur at frame 73 (the way I dislike it) and a reference image for the sort of hair I'm aiming for. I also added the project folder. ApeODForce.zip Thanks in advance!
  21. 1) Is there a way to only affect the tip of your guide curves when using the groom brush? It’s easy to grab the center of the guide curve which ends up bending them in an odd way that’s counter to the direction I’m attempting to brush the curves in. If I make my brush small enough and position my camera strategically I can of course just graze the very top of the curve but it becomes difficult when there’s a lot of guide hairs. Additionally, If I use the curve advect tool I notice that all of the guide curves that have been advected have a concave bend to them similar to if I had used the screen brush on the center of the curve instead of the tip as I mentioned above. 2) Is there a way to pop hairs out that have flipped through the other side of the surface? If I do a simple fur setup on a grid it’s very easy for this to happen with a few strokes of the screen brush. 3) Are there recommended ways to optimize the viewport when grooming? It seems really sluggish even with a modest amount of guide hairs once you start adding a few guide process nodes. My hair generate node is off of course. 4) After I place a guide groom node and use the plant guides tool to create a few custom guides the guide groom density no longer has an effect if a raise or lower the value. If I disable the planted guides, it works again. Actually I’m realizing now that even doing a groom with the screen brush seems to lock that initial guide count into place. Is this the intended behavior? 5) When using the Hair Clump node it seems like mixing the blend value to 0 doesn’t actually turn the effect off entirely. With default settings and blend set to 0 I still see very obvious clumping. It’s not until I set the fractal clumping iterations to 0 does it act as if I disabled the node entirely. With fractal clumping set to 0 and the blend set back to 1 though, the settings in the general tab (clump size, crossover rate, etc) do absolutely nothing. 6) Is there a trick to setting the influence radius and decay values in relation to both the guide curve and hair generation density? It seems heavily dependent upon how many guide curves I have of course but I’m finding that’s easy for me to end up with a look that’s too clump-y without actually having a clump node in my setup. If I raise the influence radius higher to move away from the clump-y look it starts to lose any variation I may have added to length, bend and frizz. If I come up with something that's look pretty promising with a low hair generation density I'm usually surprised at how different feeling it looks once I start to really crank the density values. Cheers!
  22. Fur and snow (+hip)

    Hi everyone! The past week I worked on a personal project for learn something about hairs - vellum. It's my first project ever with hairs so I guess is nothing special but several people asked to see the hip file so here it is. Final result: Hip file (I had to recreate it but it should be pretty much the same): groom_clumping_03.hipnc https://andreasbabo93.wixsite.com/sbabovfx/example-files (new version, there was an error on the other one)
  23. H17 Fur query

    Hi, Beginner query around hair & fur. Whilst I jumped in a had a quick look at the fur tools, I've got a little confused with SideFX help example referring to the 'Fur' node, which doesn't appear to be part of the workflow (especially from the shelf tools). This link suggests even in H17 it creates a 'Fur' node, which it doesn't for me, instead clump etc are their own node. http://www.sidefx.com/docs/houdini/fur/hairstyle_rasta.html Can anyone confirm the 'Fur' node is not used in preference for the Hair Generate? Thanks.
  24. Rotate clumps?

    Hi ! I'm trying to rotate clumps using vex, I'm new into Houdini closest I could get is using this vex code from konstantin magnus on "how to rotate faces along Normal?" topic, but the clump rotates on the wrong axis =( I want achieve the results in this video at 17:32 (Hair FX in Houdini - GDC 2017 Talk) where Saber Jlassi does some really great twists on the clumps. https://vimeo.com/sabervfx/hairfx#t=1054s Here is the file scene ! ClumpStudies.hipnc
  25. Character FX TDs - Trixter

    TRIXTER Munich is currently looking to hire experienced Character FX TDs. Booking time: From As soon As Possible. Duration of the contract will depend on the project. Location: Munich Description: Under the supervision of the CG Supervisor, the Creature FX TD is responsible for providing a wide variety of dynamic simulations and rigs for photo-realistic creatures; including clothing, fur, hair, muscle and skin. Responsibilities: · Creation of fur, feathers and grooming for photo-realistic creatures · Develop simulation setups for photo-realistic creatures; including clothing, fur, hair, muscle and skin. · Involvement in the development of departmental tools and techniques · Regularly communicating with Production and Leads regarding schedules and deadlines · To be able to work with the visual effects supervisor, and the lead CG artist to determine the best creative approaches and techniques for all the different steps in a 3D production pipeline. · Be able to deliver work within established project targets and the high quality standards of the company. Requirements: · Minimum 5 years of experience in a CFX/FX role in a VFX studio · Previous experience on CG creature projects · Excellent knowledge of Maya · Excellent knowledge of Houdini · Experience in the following dynamic simulation: cloth, hair/fur, feathers, skin and muscle · Programming experience with Python, PySide, PyQt, VEX · Programming experience with C++ for Maya and Houdini plug-ins, an asset · Knowledge of 3D-related mathematics, an asset · Experience in creating rig simulations · Rigging skills and experience · Self-driven, good communicator, and a great-team player · Excellent organizational and communication skills · Work ethic focused on the dynamism and collaboration · Ability to perform multiple tasks set priorities and problem solving · Good communication, organizational, time management and interpersonal skills. · English language skills If your experience matches above description we are looking forward to hearing from you! Please send your CV and demo reel by email to jobs@trixter.de.
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