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Found 43 results

  1. 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
  2. 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.
  3. 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
  4. 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!
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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..
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. I have one packed primitive object which consists of several pieces of geo merged together. At sop level (before it is set to become a packed primitive) I have created a core group and an outer group. I would like the core group (the red group) to remained glued only to itself and the outer group(the green group) to be spring constrained to the inner group and itself. The trick is how can I do this without manually blasting the undesired glue connections or using the delete by color method? The reason being that I have very complex geo which is very close together. I have a simple test set up .hip attached. The real which geo I am actually working on it extremely full and chaotic. Thanks! packed_relationship_04.hip
  18. Impact Glue interaction

    I am struggling to architect what I have in mind and it may be quite simple but... somehow I just don't get how to connect the dots. Attached is a file with a fractured sphere (thin shell) and a small obstacle inside moving fast, I want to break/weaken the glue constraint based on the impact data (may be after a certain force of impact. At the moment the sphere gets moved around by the obstacle, instead the sphere should break on contact with the bullet, but not against the floor. Thanks in advance. PS. All the elements inside the attached scene are using the shelf tools, specially confusing is the ImpactAnalysis. impact_glue_interaction.hip
  19. Hi everyone, I made this setup to mix constraints between conetwist and glue, depending on angle value, i set the constraint_name in a sop solver plugged in the constraint network node, it works quite well but the resulting object is floating in the space... is anobody here can check my file and tell me what's going on!!!? apparently its not a subsanple or CFM, ERP issue ( i checked all this parameters and, nothing...) thx by advance, Best regards H TEST_PACKED_CONST_METAL_V002.hip
  20. hey guys i'm back with more questions. so i did some googling, checked out some scenes and read a few threads and i think i have an idea of how to control the glue strength in my network... so i've applied colour.. used it to fracture the object and now i want that to control glue strength. i want to get it so the red areas break easily and the black is much harder to break - but i've been fiddling with numerous ways to do it and i cant seem to get it working in my scene (attached) i have applied colour which breaks it in the red areas and i'm using that in an attribute create to try and multiply glue strength. But its like it has no effect. 1.20am over here in uk so i may have it all wrong or missed something - can anyone take a quick look and see what clanger i've dropped please? thanks! ant glass_ball.hip
  21. Hey, I spent a while prepping and adding to a model house for a destruction project but I'm having a lot of trouble gluing everything together. I can get the components of the house to glue together no problem (e.g. the windows, the walls, the bricks etc). But what I really want to learn is how to glue each of the fractured components to eachother. What I mean is that my house just falls apart, the bricks dont stay attached to the wall, the glass windows don't stay in their frames the roof shingles dont stay on the roof. I'm really hitting a wall here (no pun intended). Can anyone lend me a hand in figuring out how to approach this? The picture is my destruction model. Each component (roof, walls, etc) has its own constraint network but they arent glued to eachother so when I sim the pieces just pop off.
  22. Constraint to deforming static objects!

    Hello people, Is it possible to stick constraints to deforming static objects because it follows the active rbd object motion but not the static ones. i have tried using override with sop and other methods but none of them seem to work. I have created constraints on first frame of the timeline and now the mesh is deforming so i want the constraints to remain attached to it while detaching as the object becomes active and then it should follow active rbd movement. Regards,
  23. Hey guys, Im working on a scene where I have multiple objects that require glue setups - Pretty much a living room: Tables, chairs, television, ornaments etc. I have about 50 items that need to fracture into pieces or sub-components. Right now I'm importing each piece into DOPS separately RBD packed objects (50 or so), and then I am using the glue adjacent shelf button on each of those nodes one by one. This is making a lot of nodes in the scene view and is making my DOPS tree pretty dense and tall - I'm just wondering if this is the most efficiency way to do this. Ultimately, if there is a way to group/tag sets of points which belong to the same object and just have one glue setup that would be ideal. Any suggestions or ideas?
  24. hi.this is my first time post here.i am tring rebuild but when i add a extra packedobject.I give it a glue constrain,but in the viewpot it seems like my glue constraint fly away at initial time.Any advice? explorsion01_v007.hip
  25. Cliff destruction

    Hi guys! I need help with a RBD simulation. I'm trying to simulate the destruction of a cliff portion, keeping intact the rest of the of the cliff. Right now i have three problems: The bottom of the cliff isn't flat, this leads to an unwanted initial movement (same thing with a costum collider who should follow the bottom's shape a little better), how i can avoid that?. The second problem it's the glue network, how can i say to houdini which costraint is stronger and which one is weaker? Last one (i swear ) there is a way to change the extrusion depth generated by the voronoi? Thanks in advance for any kind of help rnd.hip CliffUv.obj Collider.obj
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