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Found 52 results

  1. Glue constraint flicker

    Hi, I hope somebody can help me with a glue constraint problem. I have created an animated glue constraint. During the simulation, the constraint keeps flickering on and off between some pieces. Thus far I have tried moving the color transfer and delete from SOPs to DOPs, delete the broken constraints in a sopsolver and change the "overwrite with SOP" in constraintnetwork. Nothing seems to help and I have a feeling it is something really small I have overlooked. I have added a scene file. Thank you in advance. destTest.hiplc
  2. Hey there, I'm working on a project for my master degree and i'm having an issue with glue constraint in my DOP network. It was working well until I deleted all the geometry and imported a new version of it from Maya. The ball should go through the wall and destroy the tower partially (just the active points), but it just bounces off. Could someone please explain me how to solve this issue? It's really urgent. Attached you can find my Houdini scene. Thanks in advance! Tower_16_more_windows.hipnc
  3. [SOLVED] In/Active Constraints

    I'm trying to shoot a cannonball through a small castle. The cannonball animates and blasts through the walls, but the constraints look like they're being ignored (or they aren't hooked up properly), so the entire structure collapses the moment the sim begins. The clusters are being ignored as well, but I can't figure out why. Many thanks for you even reading this. v17.5 rookDestruction_chazS.hipnc
  4. Glue bullet

    Hello good people! Freshly new in Houdini and I am trying to tackle the basics here. I am trying to break apart a box using voronoi fracture (works) and the add a glue constraint relationship in the dop network (I have failed here utterly). I have spent about two days trying out just about everything I can find or think of and to no avail. I am using an attribute wrangle to add a constraint name to the connected pieces. My constraint network however tells me that the required data is not found or is the wrong type. I am using bullet as my rigid body solver and I have hit a complete brick wall - I just can not get it to work. I am attaching the .hip file, and I would be immensely grateful if someone could help me understand what I am doing wrong. It seems so simple yet I am completely stuck with this issue. Glue issue.hip
  5. Multiple Constraints on One Object

    I was wondering if anyone has had experience having multiple constraints on the same object and breaking them apart separately. the effect I'm aiming for is to have a some large rocks be ripped of a section of rubble and while in the air start to break apart into smaller pieces. I've tried setting up my constraints based on the groups created from the Voronoi fracture and sub fracture nodes, however this causes problem when trying to disable the constraints in different areas. Any ideas? ConstraintsHelp.hipnc NewRubble.abc
  6. Glue RBD on Vellum

    Hey guys, is there way to do this? I have to rip an envelope and it have that wax sealing it. It rips just where the wax is. The wax doesn't break but it have to influence the vellum in some way. Anyway, just a simple test with RBD and Vellum interacting would be awesome. Thx
  7. Hello, I'm relatively new to Houdini. Just playing around with Vellum, which is amazing, and can't quite figure out how to get an object to stick to another. In the demo video you see the rubber toy stick to a spider web- this is the basic gist of what I'm trying to do. Is it the Glue constraint I should be using? Any help much appreciated!
  8. Hi all, Is it possible to constrain packed RBD objects to the static deforming or animated obj? In TP its work by default without any problems, but in houdini I cant find solution. Thanks!
  9. Glue constraints, help please!

    Hey magicians, I'm getting crazy with rbd. I was requested to break a statue having "hits" like this gifs from independence day. I follow a tutorial from Applied Houdini, made constraints and stuff, but I can't get the parameters to work right, I got some better control results with voronoi fracture, but with booleans I'm having a hard time. I'm new to fracturing, I tried messing with the connect adjacent pieces, as well as glue amount. Anyone can give me some tips or direction to achieve this? Thanks!
  10. RBD glue constraint problems

    Hello all, I'm trying to learn through RBD by doing a sim where a fence gets riddled with bullets. I have the basic sim in place and where I think it all should be but when I sim it just explodes anyway instead of holding together. Attached below is the scene file because I'm truly lost. Thanks! FenceBreak_01.hipnc
  11. Hey magicians, Been getting crazy with wire solvers. I think the issue is because I get the points changing over time and the constraints go crazy. I've been reading that I need to create a id attribute with $PT to hold the value, tried that with no luck. Animation works fine until the number changes Any tip will be super helpful, thanks in advance.
  12. Well, I went out into the RBD Constraint Forest Unprepared, and now I am lost in the woods. Any help would be appreciated. I'm trying to do something that should be fairly simple, and most likely is, but I don't have the combination to the Houdini lock to get the setup to work. In the example file I have an rbd box that has 10 faces per side that have been made into unique faces. They have glue constraints holding them together and are a rbdPacked object in my dopnet. There is a low rez smoke sim that pushes this rbd box into a collision sphere that is above it, and when the geometry collides with the sphere, some of the glue constraints start to break. All I wish to do is apply either a gravity force or a popForce to these rbd pieces that have lost their Glue constraint. I want the main chunk of the rbd box that still has a bunch of pieces glued together to keep on moving with no gravity or popforce. I might be trying to go about this the complete "wrong" way since I have very little experience with Glue constraints, But I see data in the geometry spreadsheet while in the dop net called ConstraintGeometry and this has a primitive group called "broken" which contains the glue constraints that have been broken due to collision. I would think I would want to try finding out which rbd piece that broken constraint belongs to and then use that to create an "applyGravity" group of rbd pieces so that I can do what I want to do. I just don't know how to do this in dops. Is this something that needs to be done in a sopSolver or geometry wrangle or....? I'm not to familiar with how to read data from the ConstraintGeometry and apply it to the Geometry data. When I middle click over my rbdsolver, it shows the main rbdpackedobj1 with Geometry and then CosntraintGeometry below it. They are like separate entities and I'm not sure the best way to get access to both in one node, if this is even the way to do it.? For example if I change a geometry wrangle to point to "ConstraintGeometry" instead of the default "Geometry", I can then read and manipulate data on the ConstraintGeometry, but then don't have access to the main rbd "Geometry" that I am use to normally working with. Like everything in Houdini, there are probably dozens of ways to go about this, I tried about 20 yesterday, without ever getting one to fully work. I ran out of search phrase ideas to try throwing at google after about the 6th hour of searching. Maybe using some of those copyData and applyData nodes would get the ConstraintGeometry data onto the Geometry stream so they can both be read in one wrangle or maybe that too is a completely wrong direction to take. I don't want to speculate any further since you could try things for a week and not get it to work if it just isn't the right approach. I love Houdini for its vastness and unbelievable tool set, but man, it can destroy you if you don't know how to do what you want to do, and can't articulate it well enough for a search string.! Thanks for any help. E rbd_constraints_v01.hip
  13. Sticky glue

    Hello everybody! I'm trying to get this sticky glue effect like in the picture below. Does anybody know who to set this up in Houdini? I do have some experience with Houdini, but I simply can't figure out how to build this one up ;-) Any help is very much appreciated!
  14. Glue Constraint Gravity

    I have been spending some time creating and destroying a building in Houdini but am currently hung up on a constraints problem. In my hip file I have my procedural building, I fracture it, and send the pieces to be constrained together. I haven't meticulously created the constraints yet, I just wanted to get everything in and working first. When I run the rbd sim a ball crashes through the building and blows the middle part of the building away but the top part of the building just sits there floating in the air. Not exactly sure what I'm doing wrong here, if anyone can point me in the right direction I would greatly appreciate it! The hip file has a top level control node to cache everything for you to quickly test skyscraper_destruction.hipnc
  15. Hi folks, I am following Steven Knipping's tutorial Rigids II and have some behaviour here which I do not understand and can't solve somehow... You'll see the issue in the attached gif (some of the cluster in the upper part of the hole) I have basically the same settings as in his videos, but it seems that somehow the constraints are going to stick together after they are broken. At least they should break because of the metaball force (which I am using) and the corresponding huge hole inside the building and everything should collapse and not stay like in the gif. First I thought the "Overwrite with SOP" parameter on the constraint network would be the issue (which I then changed to $SF==1), but it didn't help. I am using H16.5.323. Thanks for any ideas and suggestions Cheers Dominik
  16. FEM - Can one use with glue?

    Hi guys, I've setup an Organic Mass FEM, with an active RBD producing the deformation. The RBD while deforming the FEM, pushes it out. I would like to have the base of FEM stuck to the ground. Is it possible to use something like Glue, if so, How? Any other ideas are totally welcome.. Thanks in advance Arun
  17. glue + RBD solver

    Hey! Houdini's manual states this about the glue adjacent tool: This tool only works with the Bullet Solver. You can change the type of solver in the Solver Engine dropdown menu on the Rigid Body Solver. So here's my question. Is there any glue tool that works with the RBD solver then? Thanks
  18. Hi, I'm pretty new at Houdini and am trying to find a way to get fractured objects from different glue networks to glue together. For instance, I want the wood of a window frame to have different glue strength than the glass in the widnow, so the glass shatters more easily than the wood. But I also want the edges of the glass to be glued to the frame. My attempts so far only manage to glue every piece of glass and wood together in a third network which is not what I want; I want only the glass pieces adjacent to the wood to glue together. Is there a way to do this procedurally? Thanks
  19. The effect I am trying to achieve is straightforward. Imagine a single piece of flat geometry(blade of grass, sheet of paper) that is fastened on one end only and being blown (affected) by turbulent wind causing it to bend dynamically. I'm going thru Peter Quints DOP's video and looking at the documentation for Wind Force. Does this seem like a job for Cloth Object + FEM Solver? Thanks in advance for any feedback..
  20. Hello, I'm trying to add some variance to the 'strength' attribute of 'glue adjacent pieces'. I tried using 'glue clusters, but I can't seem to get them to reliably affect the 'glue adjacent pieces' strength attribute- the nodes have changed in recent versions of Houdini and set ups from earlier versions don't really translate. Another method I would like to try is using an 'attribute from map' node to apply color from a bitmap, which would be used to multiply the strength attribute in 'glue adjacent pieces', but I'm having trouble setting that up as well. One question for either method is, is the 'glue adjacent pieces' strength attribute global, affecting each glue primitive the same way, or can it be manipulated to affect different glue primitives differently? I'm new at Houdini and would appreciate any info or a push in the right direction. Thanks
  21. Art Directed Wall Explosion

    Hey everyone, I'm trying to blow an object through a wall. I need a lot of control over the art direction. I have been doing my look dev in C4D where I can paint active vs passive objects. I can also have the active objects asleep until there is a collision detected. I have attached my working Houdini file. I haven't been able to figure out to paint active vs passive objects, so my workaround has been to alter the glue strength based on a color attribute that I created in the constraint network. This seems to work okay, but the wall get's knocked over when the collider goes through it. How can I pin this wall down to the ground? The tuts I've found all seem outdated for H16. Any help is most appreciated. Thanks! -Brian
  22. Art Directed Wall Explosion

    Hey everyone, I'm trying to blow an object through a wall. I need a lot of control over the art direction. I have been doing my look dev in C4D where I can paint active vs passive objects. I can also have the active objects asleep until there is a collision detected. I have attached my working Houdini file. I haven't been able to figure out to paint active vs passive objects, so my workaround has been to alter the glue strength based on a color attribute that I created in the constraint network. This seems to work okay, but the wall get's knocked over when the collider goes through it. How can I pin this wall down to the ground? The tuts I've found all seem outdated for H16. Any help is most appreciated. Thanks! -Brian WallExplo_Help.hiplc
  23. I have a load of RBD packed objects smashing on a Ground Plane, they're all intersecting by a consistent distance through the Ground Plane, the RBD packed objects are all convex hull rather than concave although changing between the two doesn't seem to make a difference. I've tried replacing the Ground Plane with a static box and trying different geo representations on it but that doesn't seem to work either. Any suggestions on how to fix this would be really appreciated! Thanks
  24. 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
  25. hi! I'm facing some kind of issue: I would like to fracture a geo, then create clusters from the voronoi pieces, then be able to break those cluster based on the strenght of their glue attribute. So far I only get this kind of result: A glue strenght of -1 should give me infinite strength right? so why are my pieces breaking appart inside the same cluster ? What am I missing ?? here's a simple hip if you'd like to correct me. Cheers ! voronoi_clusters.hipnc
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