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Found 49 results

  1. Hi guys, In H19.5 I tried to use the Vellum Grain, but it doesn't show the grains as a sand sprite (as usual). How can I fix it? Thanks, for helping. Vellum Sprite.hip
  2. Hi guys, In a Vellum grain sim, I would like several chunks (clusters) to interact, but not stick to each other. As you can see in the image below they stick after the collision. How can I fix it? According to the documentation, there is an option in the Vellum Solver node called "Ignore Neighbors in Same Piece": https://www.sidefx.com/docs/houdini/nodes/dop/vellumsolver.html I tried to use this option, but it doesn't work. Thanks for helping. Vellum Grain_02.hip
  3. Hello, Someone could explain why in my basic setup, the grain have still the same size ? I try to have some random pscale. Thanks vellum-grain.hip
  4. vellum grain lowres to highres

    Hi everyone, Im trying to find a way to get the same sim result when I use a low and high number of grains. I have a deformed cube (my foam shape) that I want to break into 2 parts during the sim, and want to have tiny grains on the surface for the bubbles. When I convert my geo into vellum grain with a particle size of 0.05, and add a vellum glue constraint with a break threshold, I'm happy with the sim result, but once I'm lowering the particle size to 0.01 to get much more tiny grains, the simulation behaves completely differently, which is normal. I tried to use 2 sources, one lower vellum grain for the sim, and another one for the tiny grains only on the surface, and use a point deform node to constrain the tiny grains to the lower grains, but it's not working, especially when the grains split in 2 separated parts. And since the simulated foam mesh is a VDB converted to polygons, the topology change and there is no way to use a scatter node on the surface. So is there a way to get the same simulation with lower and higher number of grains? or any another idea I haven't think about to achieve this? Thanks
  5. hi, in houdini when ever i add grain and add some constraints between them (glue constraint ) i face problem that the grains rise up in Y axis infinetly. and to fix it i increase mass in those glue constraints by 8888888 mass which became too heavy on cloth, is there any solution or i missed up something. but when i take them in dop it works fine no issue.
  6. bring data from a dopnetwork to another

    I have a pile of sand simulated with grain. I want to use the initial state for the sand and afterward use rbd to interact with the sand but the problem is, when I use the initial state nothing work inside the dopnetwork anymore. I think there a way to bring the grain data to another dopnetwork or I must do something else?
  7. Hi guys, I would like to know if there a better way to do this kind of powder stuff with a lot of detail (like the picture) than grain simulation because it's really heavy.. Thank you.
  8. Hi everyone I dont know if is it possible in houdini vellum grain to increase the actual number of particles coming out of a vellum configire grain constraint? That way one can control how much grain is coming out the the vellum grain Thank you
  9. Deform Box of Points (cells)

    Hello friendly helpers, to make it short and maybe a bit more easy to understand what my question is - a few screenshots. I tried it self coded which works well with a grid. Deforming a box works fine with a ripple solver. When i put a box into the sin-wave wrangle - the box deforms completely to the x-achsis... I want to have a box of spheres, which behave like a sin wave over the whole box. The farest where i get my head is to have the spheres sitting on the x-achsis. But i need them as a box of spheres. It would also be nice if the spheres would collide between each other. I thought of doing this with vellum grains which worked actually pretty well, but in the end i got problems with forces. Is there any way to do this with vector force or velocity volumes? Or has my code the potential to fix it fast? ^^ Have a wonderful sunday btw
  10. Hi all, First post on here on Odforce, hope someone can help me out. I've been using noises in the material network before to pipe them into parameters however; I got an unexpected result today. I've included a screenshot of the graph (just simple aaflownoise -> fit(noise,-0.5,0.5,0.25,0.35); -> roughness parameter) but got an extremely long and grainy render that was also a lot too light (the lightest frame I included). The other two frames are with roughness just set to 0.3 on the principled shader itself (The darker one has all other settings in the project exactly the same, the lighter one I bumped up the env light a bit). Feel like I'm missing something here. What's going on? Thanks in advance!
  11. Vellum Cloth and Grain Interaction

    Hello all, I'm attempting to combine vellum cloth and grains on the sop level but a few things look strange. When I merge them before the solver (like I've done in the past with multiple pieces of cloth) it looks like the grains add little square boxes onto the cloth mesh. I'm guessing these are the grain constraints but I'm not sure. Also, when I run the sim the grains stay above the cloth, never actually colliding with it. I assume the two things are related but I haven't been able to sort it out. Does anyone have any ideas? Thanks in advance. Vellum_ClothandGrain_01.hiplc
  12. Texturing geo after sim

    Hi everyone, I hope you are all well during these times. I have a quick question to ask about texturing a re-meshed grain simulation. The UVs of the mesh change and thus throwing the texture UV space all over the place. Is there a way for to remesh the grain simulation so that the topology allows the texture to stick to the geometry? I can provide the file if it helps. Thank you very much, your time is appreciated.
  13. 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
  14. Hi; After simulating a "Vellum Grains", how can I create a surface (volume) from it? Thanks for helping.
  15. Hello! I'm doing a school project, and I have to create something like a slime mesh. The main problem I have, is that I get a lot of flickering when I try to mesh the vellum grain using the particle fluid surface node. The same thing happens when I'm trying to mesh flip particles. Does anyone know how to get rid of this flickering? I've been searching a lot but can't find an answer. Thanks!! StickyFluid.mp4 bloodRND.mp4
  16. @pscale for vellum grain?

    Does anyone know if it's possible to use @pscale for vellum grain? I mean to create it on "Grain Source" and pass it to a "Vellum Configure Grain". To a "grain size" probably? Thanks. BK
  17. Vellum Grains

    Hi, I have been trying to understand the operation of vellum grains for a few days, I wanted to make a falling sack with sand as on the sideFX side, but when breaking the material it explodes. Maybe anyone will be able to help me? https://www.sidefx.com/docs/houdini/videos/VellumGrains.mp4 adds a file can help something vell_with_grain_v3.hipnc
  18. Hello Dear Houdini Community, I have been trying for hours to solve this problem. I have a simple simulation with grains, the basic idea is when the particles touch the surface more often they stick to it. they do not do that, they all disappear to one point in the scene, actually always 0, Y value, 0. Can someone look at it? Sincerely, Tim grain_test_collision_stuck.hip
  19. Houdini grain solver

    Hi, I'm trying a stage on Houdini. A castle made of sand is moving upwards. After 25 frames the castle falls down and collapses. my question is that I want the castle moving upwards at one side and falling down at the other at the same time. Thanks for your help. testGrain.mov
  20. Hi I was trying to create an effect of cloth pieces sticking to an animated object on contact. However, it seemed to release and re-attach every substep. Sometimes, they "creep" on the collision surface. These are the goals I tried to achieve 1. Dynamically attach to deforming collision on contact 2. Dynamically delete the paper if they fell under y 0. (done, thank to Toadstorm's post 3. Make the attached points static (pin to animation?) if possible, to reduce calculation cost. Here I attached the hip I'm working on. test_vellum.hip
  21. Vellum grain (particles awake by collider)

    Hello, guys! I'm new in houdini. There is a simple question: how to activate particles using a moving collision object in vellum solver? When I activate the Enable Auto Sleep (inside the Vellum Solver), the collision disappears. I tried to add a popcollisiondetect in vellumsolver/dopnet/forces, and somehow connect Cd from there with the attribute doautosleep (from Sleeping) but nothing happened. http://prntscr.com/lqbfyr And one more question: why the popcollisiondetect invert my colliders in the space (blue spheres)? http://prntscr.com/lqbi76 I would be grateful for any advice
  22. pyro explosion using grain

    hi, am working on an explosion shot (desert explosion). i have seen some grain adverted pyro examples . can anybody give some tips doing it ?
  23. When would you use FEM over Grain? The last couple of weeks I have been working with Grains, and got a good understanding of how it works. It seems that you can do pretty much everything with this tool in case of cloth and simulation of object that will deform. I haven't been using that much time on FEM, and from my perspective it looks like a tool that has a lot of overlaps with the grain tool. It could be nice to get an understanding of where the FEM and Grain tool differs and where to use which, from people that has good experience with both tools.
  24. Pop Collision Ignore + Grain Solver

    hey guys, is there a way to make the Pop Collision Ignore node work with the grain solver? I really need to avoid the collision of one granular solid object, it works fine with normal particles but not with the grain solver. grains_avoid.collision_1.01.hiplc
  25. I've been stuck on this for a couple of days now and would love to hear you guys' input. I have close up shot were a character's feet is pushing through snow up to his ankles. I decided to try grains for this (it's my first time really using it) and to get the snow together I used the constraints set outside in the grain source. Mostly the sim is working as intended but I'm getting a lot of unwanted fast movement from some particles (as if they're trying to keep the constraint but not really keeping it, so they pop in and out, and that results on a flickering on the meshing. Did anyone come around this problem before? I am up for any solution at this point, even trying another method.
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