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Found 113 results

  1. Hi, apologies if this has been asked before but I couldn't find an answer. I've done a crowd simulation in Houdini but now need to export to alembic so I can bring it into C4D as a necessity due to my company's pipeline. I've unpacked the agent primitives and had to run through a polyreduce node to create a sensible alembic, but I've lost all the UVs along the way. I'm pretty new to Houdini, please could I have some guidance on how I can export the alembic with the original UVs please? Many thanks!
  2. Hi everyone, I'm a bit confused right now because I have a weird issue on my Houdini when I work on Alembic. I have some huge (not that huge, but still) models in Alembic format and I want to do VFX stuff on it. But I can't have a proper feedback on my viewport when I do some operations on it. As you can see on the gif capture, the color does not appear in the viewport, but if I save the scene, and open it again, the color appears. I checked my graphic cards driver (I have a GTX 970), and everything's on date, and I'm on Houdini 16.0.621. Is there a solution ? Thanks in advance, Gael. EDIT : Even if I launch Houdini as Administrator, the bug still appears. I need help :<
  3. I've unpacked the geo and converted it, When I try to selected and delete or group the polys I get the error "Attempt to access and object that no longer exists in Houdini" is there a way to delete individual polygons or groups? Thanks
  4. hey all, I'm trying to cache out some geos using alembic rop output driver to let them go to maya, it works but I'm having issues customizing the name of geos to get them right in maya for instance, in a situation like the image attached, I'd like to have an alembic that contains 3 mesh, each of them with the name "box" "sphere" and "torus" , instead I have a single mesh with the name of the geometry node cheers!
  5. Hi, during the work with my maya alembic reader, I discovered a problem with alembic files written by houdini. Obviously Houdini exports an additional point geometry together with my mesh. If I load the alembic in Maya, I get a mesh shape and a particle shape. In houdini I can see two packed objects in the alembic sop. This only happens in certain situations. e.g. if I create a box and deform it, only one packed object is created in the alebic export. Only if I export my flip mesh an additional packed point geometry is exported and I get a warning in the exporter: "Renaming node to /geo1/file3_1 to resolve collision". Does anyone know what's going on here? It seems not to be a new phenomenon, it happens the same way with H16.
  6. Arnesen Cubes in Houdini

    Christian Arnesen did an awesome piece of animation with MASH, and I wanted to replicate it in Houdini: Here is the breakdown of 3 techniques for doing so, using Alembic caches, Copy Stamping, and VEX (file is attached below or at the link): Hope it's helpful! arnesen_cubes_in_houdini.zip
  7. Hi All, In Houdini 16.5 Alembic rop export, the build hierarchy from attribute behave differently now. In the past, I need to pass a proper hierarchy naming ie: /group1/geo1/geo1Shape and all the transforms will be stored in geo1 and loaded as expected in Maya. Now when I do exactly that, this is the hierarchy I got in Maya: /group1/geo1/geo1_instance1/geo1Shape Where all the transforms are stored in geo1_instance1. In a way it's good to catch any shape nodes that is not exported with its parent transform in path attribute. Is there any way to make the old way work? How do I control the "_instance" naming part in path attribute? I would like to output the hierarchy EXACTLY like how I set it up in the first place. Thanks
  8. Hello, problem how can I use the imported vertex color of cached particles in Houdini with a cloner in Cinema 4D? Story I simulated and cached simple particles in Houdini and imported in Cinema4D by alembic format. They have colors according some rules created in Houdini, in the end, it's just plain Cd. If I select particle when importing, I see no particles in viewport, so I switched to polygons. When I use a cloner to clone a sphere for every vertex, I expect the sphere to have the same color of vertex, like you normally have with a copy node, instead the sphere has no color if not the one of the shader. I know, I already asked in an other forum about this problem more about Cinema 4D than Houdini, with no success, it seems to me it's not straightforward like in Houdini, of course, with all the respect to Cinema 4D, fantastic program, and its community, but I was wondering if someone had the same problem and found a solution. Thank you in advance.
  9. Hi all, I want to import a particle simulation from houdini to Maya without using the Houdini engine and render in Redshift. I made a way around it stamping spheres into particles and exporting them as Alembic, but the file is too damn heavy. Do you have any suggestion? Thanks in advance.
  10. Hey there, I put together this dynamic fracturing following a tutorial. When I append a rop to export .abc, just the glue constraints splines get transferred, but not the geometry. Maybe the groups are not transferring correctly through the hierarchy? Can't figure out what I am missing. #n00b Thanks in advance. Here's the animated .abc I am using and attached is the .hip. breakdance.hip
  11. Hello, I was wondering if anyone could share the correct workflow for face sets in alembic. Currently I'm importing an alembic from C4D that contains polygon selection sets which are passed through the alembic. When I export the alembic back to C4D, after passing through my rig node tree, the sets are lost. Can anyone shed some light on this?
  12. Hello all, I'm trying to get Motion blur from a flip fluid sim that I Export from houdini and I Import in Cinema 4d. After researching I came to the conclusion that I could probably achieve that with the subframe cache workflow. Can someone please clarify this workflow to me ? thanx, Ioannis.
  13. Hello all, Newbie calling for help here. Now, more angry and with less hair... I am trying to export out an alembic file that will have my packed fracture in a grouped hierarchy rather then a solid piece of geometry. My end product would be an alembic that I can auto assign bones(via script) to each piece of geo inside of maya. From there I would like to export out as an FBX. My geometry setup in houdini does have an Assemble node with Create Groups, Create name Attribute and create Packed Geometry selected. In my fracture voronoi I have an attribute created called piece. Also in my voronoi tab under groups Ive selected create groups with named prefix, interior and exterior groups. I dont know if Im setting up my tree wrong in my fractured Object (Door) or if my settings to render out with a ROP Alembic are jacked. So my question is 2 fold, Am I setting up my packed fracture correctly to give me individual pieces come alembic time. AND are there special settings/ and or combination of settings of both. Ive read the manual, rumbled through sites and still no bueno. I've included my scene for further diagnoses. ANY help would be greatly appreciated. I've also tried incorporating Laidlaw's RBD/FBX export into my hip and couldn't get it to work. On that note any FBX workflow that can be recomended. I tried the game tab RBD to FBX export but I'm confused as to what node to export I should select in my file. Everything Ive tried so far just throws an error Again I appreciate ur help! DoorExplode_OD_v005.hip
  14. Export Multiple FBX Using Python

    Hey, so I have a situation where i have exported a load of rbd simulations to alembic and i now, after re-importing them back in as alembic archives, I want to export them out from Houdini as FBX. Now, i can do this fine on an individual level, but it takes a while to export each one and then I have to come back and export the next one when thats finished, usually an hour later or something. What i I would prefer to do is to create a python script to automatically export the next one so i can leave them all going over night or something but I dont have any idea how to do this. Can someone please help me out or point me in the right direction? Thanks
  15. Hi, I created a few assets in Maya PaintFX, and exported them as an alembic cache, the have animation of 100 frames. I would like to repeat those animations and loop them (or maybe even reverse loop them) or overlap the animation, as you would do in Maya. Houdini does not have animation options in alembic file, so how would you loop said animation? Thanks!
  16. Hey, guys! I'm a bit flummoxed as I've been exporting Alembic files from Houdini to use in 3D Studio Max for a while with no issues. But I've been struggling with a particular file all afternoon that's causing Max to crash. I've dealt with alembic files at least twice as large as the one in Max without any issue, so I doubt it's a size issue. I pulled the file back into Houdini and had no issues with the file in Houdini. I've tried both Ogawa and HDF5 formats. I've tried it on a couple different computers with the same results of Max crashing. It crashes when it gets about half way through both playback of the alembic as well as trying to export a Vray proxy mesh. Now, the effect in question does rely heavily on a boolean opperation from houdini to basically dissolve away a mesh, so could this have something to do with it? Any ideas?
  17. So I have an odd problem I haven't been able to figure out yet. I have a Synology DS716+II NAS raid and using it as a shared drive so I can use HQueue to render jobs on other machines. That all works fine to render on the farm, however when I write alembic data to the NAS, I get an error everytime I try to read it back into Houdini or into maya. If I write the exact same alembic data to a local drive on my computer, then there are no read errors. And this seems to only happen with alembic and fbx data. I can write hip files and bgeo's all day to the network drive and everything reads fine, just alembic and fbx data that fails when trying to read it back from the Network drive. Does this make sense to anyone.? I would think if this was a firewall problem or permissions type thing, then no data should read or write to the NAS. The exact error I get when trying to read alembic data back into Houdini from the network drive is "Error evaluating alembic file". ANy help would be appreciated. Thanks E
  18. Hi everyone ! I need help for a project that I need to finish before next week, I have created a crack propagation (with VDB) on a simple geometry in Houdini, but unfortunately when I play the animation of the alembic exported file in Maya it makes crash the application… A workflow is described by Wayne Hollingsworth from gnomon here https://www.youtube.com/watch?v=RHLDS3SrZfs&t=3025s between 1:02:50 and 1:05:00 but once in Maya he uses Vray proxy import instead standard import to keep UVs. I share with you my houdini file (hiplc, h16), the alembic file size generated in houdini is under 100Mo As I am pretty new to houdini there are maybe some mistakes, if you see something wrong or if you have an idea to solve the problem, tell me thank you very much ! Alexandre calcification_v2.hiplc
  19. Hi everyone, Here's a weird one: I am trying to use the crowdsource to copy a simple agent animation on a point sim. It is basically a swarm test. Now the problem is that when I try to render my agents they render as boxes. So far I have done a couple days of research but I didn't seem to be able to find a solution or anybody with my same issue. The simple answer that I gave to myself was "use the copy sop with some timewarp stamping for each point" but the copy sop gets too heavy to quickly. Does anybody have an idea of what am I doing wrong? I have attached a zip file with the hip and the fbx of the bee animation. Thanks for your help! bees_test.zip
  20. Hello, I am a third year animation student starting vfx. I have a simple disintegration animation for my major project that I have done on a sphere and now I need to transfer it to a hand animation that I have done in Maya and cached into an Alembic. As the animation and FBX camera export start at frame 1671, I changed the simulation to start on that frame. However, the simulation has stopped working and I'm not sure if I have transferred the effect correctly. I have provided the files, thank you! shot16.abc shot16.fbx I have provided new files! I managed to get the sphere to swap with the hand but the effect doesn't work still? It doesn't become smoke and disintegrate infect_point_Scene16.hipnc
  21. Hi Is there any way to export and import a sting Attribute from Maya -> Houdini and Houdini -> Maya from a transformNode, (not from the shapeNode) via alembic ?
  22. Hey guys, I have a scene with one object copied into thousands of points (particles). Since I'm using packed primitives, the scene gets super fast on Houdini but it's impossible to export it out. Does anyone knows what would be the best way to send it to Maya? Is there a way to, maybe, export it as a placeholder (a box for example) and, inside of maya, replace the box with the original object, maintaining it's matrix (pos, rotation, scale..)? Thx, Alvaro
  23. Hi, Case: I import a car (alembic format) into Houdini. The car's door is closed and consists of many geometries. All these geometries are located under one specific transform node in the alembic hierarchy. This transform node's pivot is placed properly in order to just rotate the door open. But I can't for the life of me figure out how to just "grab" this transform in Houdini and rotate it in order to open the car's door. I have imported the alembic ("alembic" SOP). I'm choosing "Create primitives for Shape and Transform nodes" and "Primitive groups: Name group using Transform Node full path". I can now create a "transform" SOP directly after the "alembic" SOP and move around geometries. In the translate node's "Group" dropdown menu I can see all the transform nodes from the alembic. But when I select one and then translate it, nothing happens. It works fine to select a geometry instead and move that. But I need the transform which holds all the geometries. How can this be done? I can also select all individual geometries which are part of the door by defining the transform's Group: @path=="*door_left*". However, now I need to somehow fix the fact that the pivot is not where I intended it to be. I can see a red/green/blue axis marker in the scene view exactly where the pivot should be. Can I somehow snap the pivot to it? Any ideas? I need to move and rig a lot of stuff based on the alembic's transform nodes so this isn't just this single car door that I need to apply this to... PS. I don't want to use "alembic archive" and insert null nodes into the network (which can then be translated). First off the pivot will be off and second; these nulls will be deleted when I reload the alembic.
  24. Zero gravity FLIP Sim

    Basically I have a 'liquid metal sphere' that floats up in zero gravity and starts to peel off using a flip solver and reveals the solid metal sphere underneath as everything peels away with a paint like viscosity. I have it all working EXCEPT for when the FLIP sphere and collider move upwards (because of the animation i want it to look like zero gravity) it leaves a trail behind it kinda like where it starts the sim, ' I want to have it all move upowards and then the gravity starts to peel off the 'paint' from the collider sphere Thanks for any suggestions also attached an example file ZeroG_test.hiplc
  25. Hi! did anyone experience the same issue? I imported an Alembic file with different face IDs to Houdini. But when I export it back via Alembic just for testing the ID grouping is basically right, but they don't have the correct order/ID… , they are randomly distributed. I cannot see any pattern. It's neither alphabetically nor based on face count. My node tree consists of: Alembic Import Node –> ROP Alembic Output. On the left side you see the original mesh with correct Material ID order and on the right side the imported Mesh with the wrong material order. Does anyone has a solution for this? Thanks in advance!
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