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Found 13 results

  1. Long story short, I have Prim_IDs written into a 32bit exr channel. I want to be able to delete geo primitives that do not show up in that EXR channel. I'm still a noob so any tips would be appreciated no matter how high level. Is it even possible to index all the render-present Prim_Ids and then translate them into an index that SOPs or VEX can operate on? Note: I had built a pretty cool set up that did traces from points on each primitive back back to the camera, but in order to avoid false positives and negatives without an absurd number of traces I thought the raster solution would be worth it.
  2. I have two separate stacks of geo made using copySOP's, i am trying to get them to interact with each other. They do interact with each other but the constrains only effect one model, i can switch them in the merge but its only ever one that holds together, the other falls apart instantly no matter what the glue strength is. Ive put photos below and attached the scene file with the model that needs referencing in. New to Houdini so any help or advise would be greatly appreciated! Thanks PlateSimulationTest001.hipnc plate.obj
  3. I Have stacks of plates and bowls that i made with a copy node on one original model of each type of plate or bowl rather than importing each model multiple times. I want each object to be able to fall and smash independently which i am struggling to work out. When i make the stack a RBD Glued Object it either all moves and smashes the exact same way like they are being read as one whole piece rather than individual plates/bowls or they move individually but the glue errors saying "making objects from different solvers mutual affectors" so they cant smash. Sorry if this is a basic question i am new to Houdini, any help would be greatly appreciated!
  4. Hey guys, working on a destruction shot which will involve a dragon thats being animated currently landing and somewhat destroying the building i have - Did tests with dropping spheres etc to get the constraints as i wished, then brought in a very rough 'previs' level peice of animation of the dragon i did - and as you will see from what i provide it doesnt collide correctly - i have tried increasing substeps - my collision volume matches my mesh almost perfectly, so really unsure what the issue maybe? Any help would be great (alembic and hip file below) and the youtube video link is to the latest flipbook i have showing the issue (please excuse my terrible dragon previs animation) Destruction_v2_t1.hip dragon_previs.abc
  5. hi everyone got a little problem here - i've setup a ragdoll system for my crowd... i've animated a door in maya that opens up and that was exported from maya via alembic. the prob is as the characters run towards the door they sort of collide around a bounding box and i cant figure out why? has anyone encountered this? Its really pickling my head - they are clearly hitting a bounding box of the opening doors I'm afraid i cant send a scene either anyone any ideas? thanks ant
  6. Hello! I'm encountering a little problem with Pyro Fx. When I export a geo file from any fire, the attributes of heat, temperature and fuel look good in the viewport but when I render them, I get a particles cube. It seems that those attributes are not exported in my bgeo files (I tried with Vdb files and got the same result). Is it a bug or is there a step that I missed in the export? Thank you!
  7. Hi everyone, I have a little problem with a mesh (splatter snow), where in some areas, it just doesn't render the proper shader and it's just black (black particles). Any ideas of what that could be? It is no the shader, because even if I render a frame with emission to 1 the rdr still shows black spots. Cheers amigos.
  8. Hi, Im working on a desert scene with a dust cloud blowing over some nice sand dunes geo. No matter what I do the pyro keeps clipping straight through the geo. The weird thing is this did happen with particles. Heres some of the things I've tried: Selecting the geo and making it a Static Object, Selecting the geo and making it a Terrain Object, Ticking the Use Deforming Geometry box, Ticking the Create Active Object box, Unticking the 'Use Volume Based Collision Detection' in the Collisions/RBD Solver tab. Changing Offset Surface from 0 to 1, 2 or 3. Im guessing there are some nodes that I will need to work with and connect up in order to produce a better collision but I do not know where to start. Any help appreciated, Thankyou Charlie
  9. Hey guys, I assume that the best workflow could be: 1st - Write the particles simulation to disk 2nd - Read the simulation files to generate the mesh (+ cache the geo file) Now, what is the best way to save the particles simulation? Should I do it inside the "particle_fluid" node using a "ROP Output Driver" or a "Flie" node? Should it be connected to the "import_particle" node? Something like this: and how should I read those particle files back? Please let me know if there's a better workflow on it. Thank you, Alvaro
  10. Hi, I'm trying to scatter points onto a surface provided from maya and imported as alembic geometry. To get the result I need, I have to convert the outside geo into a curve and then use a polywire to outline the geometry. Afterwards I need to scatter points into the polywire. However using the rest at frame 1 and then attribute interpolating the points onto the surface I still get twitchy points. Is there another way to do this where the points are static and moving with the polywire? Is there something I missed. I am not using a rest node, I am simply freezing the points on frame one. Thanks in advance.
  11. Hi there, First time poster and fairly recent Houdini convert (half a year). I have a problem that I'm not sure how to tackle. I have a piece of geometry that I would like to wrap in string. Not necessarily overlapping and places where you can see the original geo (so not covered 100%). First I thought I should go the POP route but I can't figure out a way to crawl the object so the lines are somewhat neat. Painting where the lines will go is tedious and not really what I'm looking for. The POPs way would also mean I need to run the sim to get the object covered. I'm not sure if I have a lot of time to finish this look so I would love the quickest way to generate this on say 10 objects. Second I thought of using some sort of DOPs and attract the curves to the geo. This seems even messier and harder to control than the first route. Also I want to stay away from having to do this via a texture map to generate a displacement. I know I could do it fairly easily via a displacement map but at the same time I think this method would be the least accurate and not as procedural. If I can't do it procedurally I might as well hop back on C4D or Modo for the job and do it that way. I want to use the right tool for the job, you know? Any help would be super appreciated. I've fallen in love with Houdini and I am trying to use it in every project I do!
  12. Hi Odforce, I am currently working on a shot that requires identical Mattes from a software to another. I use Houdini 12.5. Apparently Houdini has no direct implentation of Ptex. I searched and I found a way on the net by modifying the Mantra custom shader. It seems to work in part. I get a deformation from displacement, but not as much as the Mesh from Mudbox. Plus, the displacement creates little ''holes'' around the displaced areas. One of you has ever used Ptex with Houdini? What is the appropriate workflow for Ptex in Houdini? https://copy.com/mSjQbJCfMpLf Thank you very much for your help.
  13. Hi everyone! I'm a beginner in Houdini and I'm having a difficult time trying to attach tentacles of a jellyfish to its head. I have the head made from revolving two curves and converting them to polygons. I then tried to group selected points and copying the tentacle polygon to the aforementioned points. Is there another way that I can attach these tentacles so that they are attached to the head? Previously, I just had the tentacles revolve around a circle, but they only appeared to be attached to the head. I'm planning on exporting the finished polygon into Maya later on as well so I can't have any intercepting polys. This is what I want, but in Houdini: Thank you!