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Found 123 results

  1. Hi everyone! I've been stuck on a particular problem today. I've been using a simple voronoi in Houdini to fracture a rock, but I'd somehow like to bake a layered texture or vertex map so you can see the lines emanating from the shell of the model. I've attached a picture of some agate so you can get a better understanding. This is so I can export the alembic into C4D and apply different textures to these 'ridges' using the vertex map, or just a baked texture outright. I'd only need a couple of bands at the outer edges, not going all the way to the center I initially tried converting the rock before the fracture to a volume and baking a ridged texture using the depth from this, but I just can't seem to figure it out. I also tried copying the rock a couple of times, sizing it down a little, then used these copies to bake the vertex colour, but it still wouldn't budge! I'd be very helpful for any tips as it'd be great to get a procedural solution to this problem
  2. Hi everyone ! I'm having issues with the voronoi fracture on concave geometry. I'm trying to fracture a pillar which was created in C4D. To do so, I create a VDB and scatter points in it, then I use the Voronoi Fracture SOP on the base geometry. It works quite well overall, however on some curved concave areas the voronoi fracture fills the area, which I would like to avoid. I attached images to the post; on the second picture the darker parts of the fracture fill the hollow space. Does anyone know how to fix this issue ? Thanks ! PS I have not attached the .hip file since it's based on a heavy alembic file, but I can do so if necessary.
  3. how to create voronoi morph

    So I stumbled across this effect and i'm really curious as to how it was created. Any ideas? Thanks. https://www.youtube.com/watch?v=Exkbj37yu14
  4. Voronoi interior detail

    Hello Everyone! I would like to add an interior detail for fractured pieces but I cannot seem to find the option in the voronoi fracture sop even though Houdini knowledge base says exactly this: "you can enable the Add Interior Detail checkbox on the Interior Detail tab of the Voronoi Fracture SOP node. This gives you access to parameters to bricker the flat planes and add some noise." (Link: https://www.sidefx.com/docs/houdini/dyno/voronoifracture.html) I also tried using RBD material fracture as an alternative as I can link it to an RBD interior detail but it messes up my geometry and distorts the etched logo so voronoi fracture sop is the cleanest reuslt I was looking for. thank you very much in advance! voronoi.hip logo-galler.ai
  5. Hello After my voronoid fracture (with Manhattan approximation) , i will like to give each cell a different ramp attribute to drive and build my displacement. Like in substance. I have trouble to implement this in vex directly, and i want to use the lab ramp. I unlocked the had, but once again ,i failed to drive the circle prim arc value with my attribute generated before, unique per piece. i definevely have trouble with that, to drive my local variable with a attribute @.. I could do in a transform by using : point(opinputpath(".",0), $PT, "fRotationAngle", 0) but not in the subnetwork of the lab gradient tool... it doesn't recognize my attribute... it's what i wrote below Any idea for a fix, or in a brute force vex approach please guys? cheers, vincent* @konstantin magnus
  6. Dual mesh to Voronoi mesh

    Is there a way I can change a dual mesh into a Voronoi mesh? Here's a link to a dual mesh video. Houdini Quicktip 004 Quick Dual mesh - YouTube
  7. I have 2 pralines that collide and break to pieces. They are prefractured with Voronoi fracture, then put into an RBD Sim. I'm exporting them as an alembic and rendering them in C4D. They are polyreduced with displacement at rendertime and this is where I'm running into an issue. The displacement is revealing the edges of all the prefractured pieces before they break and also in the chunks that never actually break apart because of the constraints. I tried merging all overlapping points both with fuse and clean after caching the rbd sim and removing manifold polys with the polydoctor node, but that won't remove most of them, probably because some pieces have already moved a tiny bit apart before the collision. The issue seems to be the manifold polys though, because when I go in and delete them by hand in C4D the gaps between pieces are not visible anymore. Is there some way of merging all pieces that havent breaked apart yet and clean up the geometry of the cached geo at every frame , so I can apply a proper displacement map?
  8. I have 2 pralines that collide and breake to pieces. They are prefractured with Voronoi frature then put into an RBD Sim. I'm exporting them as an alembic and rendering them in C4D. They are polyreduced with Displacement at rendertime and this is where I'm running into an issue. The displacement is revealing the edges of all the prefractured pieces before they break and also in the chunks that never actually break apart because of the constraints. I tried merging all overlapping points both with fuse and clean after caching the rbd sim and removing manifold polys with the polydoctor node, but that won't remove most of them, probably because the pieces have already moved a tiny bit apart. The issue seems to be the manifold polys though, because when I go in and delete them by hand in C4D the gaps between pieces are not visible anymore. Is there some way of merging all pieces that havent breaked apart yet and clean up the geometry at every frame of the cached geo, so I can apply a proper displacement map?
  9. Hi, Probably a fairly simple answer to this one... I've scattered my source points onto a grid and fractured an identical grid using a voronoi fracture. I have a Point VOP which I've created which animates those source points. What Id like to do is have each of the fractured voronoi pieces follow the animation of it's associated fracture source point. Hip is attached. How would I go about this? Thanks for the help Voronoi_Points.hiplc EDIT: I achieved what I needed using the Assemble SOP, and applying my Point Vop directly to the packed geo. Though I am still curious to know, without an assemble SOP, how you would assign a group of @name:piece* primitives to a follow the fracture points?
  10. Controlling fracture pieces

    So, I am very new to Houdini, by that I mean a few days new. I came from a blender background. I had a very specific effect/set of effects that i wanted to achieve when deciding to learn Houdini (Seen in the video). Despite only having been using Houdini I have developed a effect that is good, but not for all instances. I have created a very similar ground fracture using the following node system: This works for ground simulations, but it is not satisfactory for the fracture simulations found on the statues. Essentially I just want to be able to affect the fracture pieces encompassed in a bounding object, but keep all the other pieces in place (see 0:06 in the video). Quick capture of my current simulation below. https://gyazo.com/e96f7a80027bc63dd3c6832c19b0e14f
  11. Hey guys, When I use the Voronoi Fracture sop on geo multiple times I'm finding that the new breaks are applied to the original geo, and not the fractured geo. That is the new cracks do not stop when they reach an existing crack, but instead continue through it. See attached for what I mean. Any help would be greatly appreciated!
  12. Hi all! There's 1 week left to register for my Mastering Destruction 8-week class on CGMA! In supplemental videos and live sessions we'll be focusing on some of the awesome new features in Houdini 18, and exploring anything else you might be interested in, such as vehicle destruction. For those that haven't seen me post before, I'm an FX Lead at DNEG, and previously worked at ILM / Blue Sky / Tippett. Destruction is my specialty, with some highlights including Pacific Rim 2, Transformers, Jurassic World, and Marvel projects. I've also done presentations for SideFX at FMX/SIGGRAPH/etc, which are available on their Vimeo page. If you have any questions, feel free to ask or drop me a message! https://www.cgmasteracademy.com/courses/25-mastering-destruction-in-houdini https://vimeo.com/keithkamholz/cgma-destruction
  13. Hi, I search a lot of tutorials and topics but i didn't find any satisfactory answer. I think it's something very simple but I don't understand that it fails. I am trying to create a fractured mesh with "voronoi" or with "rbd material fracture" and then I want to add a limit to the thickness. Many of the examples or questions logically end up saying that best options is extrude but in my case it is a fairly complex mesh and destroy it, then it's not a valid option. Then something as simple as create a fracture and then making the inner boolean and it does not work, only very very small pieces are separated (I have tried it both in explodeview and in rbd and it does the same). Here a file with a very simple example of sphere, sorry for english and thanks in advance. boolean_in.hipnc
  14. Hi, I am using the rbd tools in H17. I'm, confused by the name prefix attribute on the voronoi fracture. If it is not set to "piece" then my glue constraints do not work. I would assume that the prefix attribute could be anything? Certainly the subsequent geometry and constraints points / prims are labelled appropriately. Ultimately I would like to constrain multiple objects with multiple fractures. I can achieve this by offsetting the piece 'index' with each fracture, but this is clumsy. Surely it could be achieved using the primitive name prefix attribute? I have attached a scene file containing a single object with / without name prefix as "piece" and a multiple fracture setup. Any help is gladly received! jhealy_fx_rbdOdforceQuery_v001.hip
  15. Good evening everyone! One problem PolyBevel does not work. Can someone tell me? I can’t get a smooth bevel around the edge. See here that I uploaded a GIF video and also a HIP project. polybevel_voronoi.hip
  16. Good day! One problem is that smooth wire shaded does not see as wireframe. I use the Houdini FX 17. how to enable to see smooth wire shaded? See here that I uploaded the GIF video.
  17. Hi, I want to select the outer pieces and delete them, I tried to use the delete node and set the Group to ‘outside’ but this only deletes the outer faces rather than the whole piece. To do this, I tried to create a group of outer pieces selecting manually the primitives (faces). If I do it manually it'll work. for that just need to drop a group node and start selecting primitives from outside. In this way, it'll take forever to select outer pieces of a large scale model. I did not find any other sufficient way to do this! also I found this file from sidefx which works exactly what I want but did not get how it is working! Deleting Outside Pieces.hip
  18. I want to use scatter points to create voronoi regions on a mesh similar to the clump map shown in the screen shot. No fracturing. Has anyone done that?
  19. Hi; I tried to fracture a baked animated character (Alembic), using voronoi fracture SOP. I want to use it in a vellum sim, later. I used "attribute interpolate" SOP to fix scattered points on mesh based on UV. The problem is fractured pieces (and primitive numbers ) are changing over time. How could I fix this? Thanks for helping.
  20. I want to make Voronoi like the picture. Can I have some help please?
  21. Hey guys, Pretty new to Houdini after many years of Maya. I'm importing an alembic and want to push the path attribute all the way to the end to retain the original hierarchy. When I add a voronoi fracture only the inside group seems to maintain the path attribute. The outside group and my original group that I defined before for the object I'm shattering have empty path attributes. How can I copy the correct path attribute back onto the fractured pieces? (If I have multiple prims/ want to maintain the original prims path attr) Thanks guys!
  22. I'm trying to make a plane of simple rolling hills using voronoi. I don't want realistic terrain, just basic smooth curved circular overlapping mounds with phong material. I think what I need to do is generate flattened spheres that extend outwords from the center of each cell, but I haven't been able to locate the right node to do that. I've tried grid -> voronoi fracture -> smooth -> extrude but it can't get anything that looks rounded. What am I doing wrong here? Why does everything I attempt look so "rocky" like broken glass? First image is what I have, others are examples of my intended look (more or less).
  23. Remesh using scatter points

    Hi, im trying to create a reptile scale tecnique, using points scattered along curves on a mesh where i'd like the scales, and i came across this amazing work by psop creating a chameleon.(https://cghow.com/making-of-jbl-chameleon/) Does anyone know how you can go from the first mesh which is the classic quad meshed character, to a remeshed version based on connecting all the scattered points on the mesh? i've tried everything i can think of... 1.triangulate2d, then restoring positions, but its not good for complex mesh shapes. 2.tetrahedralize, not so hot as cant tell it to only grab points from the surface of the mesh, it goes mad connecting innards of the mesh like a lattice. 3. i then tried "point iso cloud" which is great for laser scan reconstruction, and uses my custom scatter points to make the mesh BUT does not result in a mesh that uses my scatter points as the actual mesh points. 4. is there any mileage going down the vex route, creating a UV, then instead of searching for nearpoints in 3d space (where you could grab near points that arent actually connected on the same part of the surface of the character), and instead search distance on the UV positions of the points? 5.voronoi fracture the mesh using needed scale position points(scatter), then trying "compute dual" on the divide SOP. this feels quite close, i just need the mesh thats constructed by connecting the scatter points making lots of triangles; once ive got a mesh with the points of the connected triangles at the centre of my desired scale positions i can then compute the dual and HURRAH! ive been smashing my head against a wall for days now, id really appreciate some brain power as i think ive burnt all mine out!! cheers J Atomic14
  24. In the the following paper, there's an image of an elephant figurine decorated with mosaic tiles. The voronoi diagram of the points created the tile shapes. What do I do to copy this method in Houdini? Dart_Throwing_on_Surfaces.pdf
  25. Controlled Multiple Fracture

    Hey, I've been trying to figure out how to control a fracture of copied packed objects but I feel very stuck. Each object should have their own inital frame to start fracturing on and they should be able to overlap for example A from F1-30, B from F10-40. The fracture should also be from top to bottom. Would love so much if anyone could help me in the right direction! Thanks! fractureMultiple_controlled.hiplc
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