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Found 141 results

  1. Bullet collision ignore

    the "collisionignore" point attribute works when it is ignoring static RBDs, however it doesn't seem to work when ignoring active RBDs.. is this a bug?
  2. Hi everyone, PROBLEM: no interraction between flip and Fracture object WHAT I DID: i create a flip tank, 1 cube shattered falling apart into the flip tank, and another cube falling straight into the tank. The problem is, when i make a cube fall as it is, the interaction are great, but from this cube are shattered and turn into dynamic piece, they are no more interaction. Anyone have any ideas ? I used houdini 13 (because of a lack of ressources) I linked the scene files, if u want to have a look. Thanks a bunch test.hip
  3. min_activation_impulse problem

    Hello all, I'm using Houdini 15 and the new point feature of min_activation_impulse together with active and activationignore. It's a simple bricks wall and a cone smashing bricks. The problem is Whatever value I put for min_activation_impulse, as in the scene is 500, the bricks react always. What am I missing? Thank you bricksWall4odforce.hipnc
  4. Hi! I was wondering why when having active RBD objects in a passive RBD container start to gain very aggregated velocities when the passive deforming RBD starts moving around. I was expecting to have pretty much a box with some objects in and the box moves around. But when the box moves around all RBD contents inside would just go crazy and pop out like popcorn. Tried multiple collision substep settings, played around with density ratios, bounciness, all kinda the same result. I'm using bullet rbd solver for that. Thanks! Nhat
  5. Recently I discover something interesting after smash my head against wall for a few days. Im creating a simulation using bullet and packed prims, and I need activate (using i@active variable ) the pieces in choreographed way over the frames But the thing make me crazy is that bullet change ptnum of each packed primitive over the time, and I think is about some priority list inside the algorithm of the solver. because after the simulation I need to atach some atributes for each simulated piece. Then I realize that I need to attach theses attributes before simulation or atach some sort of ptnum tracking for them. bullet activate order points_v001.hip
  6. Hi all, I have been learning to use bullet sim for the past few weeks and was trying to add thickness for my breaking teapot. I have unchecked "Create Inside Surface" at the Voronoi fracture node to remove the insides, but currently the surfaces are paper thin. I have tried all the extrude nodes, but my surface points seem to get wonky. I am also wondering if there is an effective way to auto freeze the small pieces from rolling around, I have tried some solutions from the forum but it haven't completely stopped it. I am guessing it is a drawback for using bullet sim or I shouldn't be cracking the geometry into really small pieces. I have attached a picture and file too Thank you! voronoi_v002.hipnc
  7. Shattering car windscreen effect

    Hi All! Relatively new Houdini user hear already stretching my very finite knowledge to breaking point! I'm attempting to create a shattering car windscreen effect whereby the glass bends and contorts overall but at the same time breaks apart into smaller shards. I have my deforming windscreen geometry that I've brought in as an Alembic import (The animated geo's from a Maya Ncloth sim). I also have a static version of my windscreen geometry that I've shattered into glass fragments. I was hoping there might be a way to set up a constraint network whereby the glass fragments stick to the deforming Alembic geometry (Which I've turned into a Static RBD) while at the same time allowing me to pick and chose when the glass fragments fall away from the deforming object. I'm able to glue all the glass fragments together but having these follow along with the deforming imported geometry is a little beyond me at the moment Any suggestions for the set-up would be massively Appreciated!! J.
  8. BulletSOP - Open source

    BulletSOP is implementation of Bullet library (bulletphysics.org) inside SideFx Houdini (sidefx.com). It's a plugin for creating incredibly large rigid body simulations on average PC. The Tool is very powerful, flexible and speed is very impressive as well as memory footprint. The plugin is free and without limits! So you can create truly stunning massive simulations. BulletSOP is compiled for Houdini production builds. It includes many example scenes (beginner -> professional) which are probably the best learning resources. Official repository on Github. Main features: - Bullet RBD Solver - Support for multiple Broadphases, Constraints Solvers - Loading data from previous frame - Geometry decomposition (Tetrahedra, Voxels) - Static/Animation body - Convex Hull - Compound Hull - Deform static Hull - Primitive Hulls - Constraints (auto-generating, spring, 6DoF) - Collisions Groups - Object Forces - Point Radius Forces - Delete Duplicity data - Instancing - Emitting system - Includes many example scenes for studying - Support for Windows(64bit), Linux(64bit) and OSX(64bit) Links: Houdini: www.sidefx.com LinkedIn: www.linkedin....Houdini-4796605 More author's videos: vimeo.com/user3251535 Create freely, simulate quickly and enjoy fully! Best wishes, Milan Suk
  9. The Hero vs the Villain! Personal project. Wanted to do some massive house destruction, also had an idea about these two characters. Maybe you can recognize one of them xD Modeling: Maya. Destruction dynamics: Houdini. Rendering: Houdini, Mantra. Compositing: Nuke. More info in the video description
  10. Hey everyone! I am in the RnD Process of having a bottle filled with water crash to the floor. I have set up the Bottle with Bullet and constraints. Which works fine. Also the FLIP Fluid without Bullet works fine too obviously. Now if I merge the whole stuff the first few frames mostly work well. But the moment the bottle crashes to the floor the Bullet Sim kinda gets horribly explosive. I tried different flip collision method, yet they do not pick up the very thin bottle geometry. Any ideas on how to make this work properly? Or should I just sim both things one after the other? Assuming the water would not have an massive effect on the behaviour of the Glass? Thanks so much for any help in Advance! Hipnc attached. WaterInBottle_003.hipnc
  11. I am new to the packed primative RBD in H14 and have found some examples of sops level activation, but how do i make an rbd packed primative active based on a hit or force value? For example a sphere hitting a cut up box suspended in the air? Here is a basic scene. I have attempted to use the sop solver but i just don't get it. Thanks.
  12. Shattering an animated object in houdini 14

    hi guys, I've been working on a shot of my own where a aircraft crashes on the Ground ( reference - airplane crashing scene from KNOWING) . I am aware of the prefracturing process of vornoi and till now I usually worked on static objects so this one is already animated in maya. I got the plain obj seq in Houdini just figuring out how to shatter while the animation still goes on. Found a very less articles about it . Have a very faint idea that its something related to dynamic constraints! can anyone enlighten me about it or any tutorial link for it? Thanks already!
  13. I have a RBD sim, with 1 packed object which contains 9 elements. I am trying to disable the gravity only on certain elements, within the packed object. In order to achieve this, I would like to control the gravity node with a dop group. I created a point attribute "falling" which I control in a sop solver, within the dop network. Then I created a DOP Group that creates a group based on the following expression: point($DOPNET+":"+$OBJID+"/Geometry",$OBJ,"falling",0) Now, this seems to work but ...not quite. I see elements that start fluctuating at a certain moment, but this moment doesn't match the moment when the "falling" attribute is triggered to 0. To start, I'd like to understand if I am using the above expression correctly. I am quite confused with the global variables $OBJID , $OBJ used with Packed Objects. Could anyone shed some light on this? I am on H13.0.547
  14. FLIP with Bullet Interaction

    I'm trying to create a effect where I have objects inside of liquid. The FLIP simulation alone looks nice but after adding around 50 Bullet sphere's to the sim the result is lot worse. Feedback scale is set to one and reseeding is turned off. Overall the interaction between Bullet and FLIP seems to be working fine but it feels that the liquid is losing some of the volume. Point count doesn't change tho. I tried both packed prims and usual geometry for Bullet and I am using usual geometry at the moment because I got better results with it. Any thoughts on how to keep the volume of the liquid same? Oh and Houdini I'm running is 14.0.201.13. Cheers!
  15. BulletSOP 2.0.15

    BulletSOP is implementation of Bullet library (bulletphysics.org) inside SideFx Houdini (sidefx.com). It's a plugin for creating incredibly large rigid body simulations on average PC. The Tool is very powerful, flexible and speed is very impressive as well as memory footprint. The plugin is free and without limits! So you can create truly stunning massive simulations. BulletSOP is compiled for Houdini production builds. It includes many example scenes (beginner -> professional) which are probably the best learning resources. Main features: - Bullet RBD Solver - Support for multiple Broadphases, Constraints Solvers - Loading data from previous frame - Geometry decomposition (Tetrahedra, Voxels) - Static/Animation body - Convex Hull - Compound Hull - Deform static Hull - Primitive Hulls - Constraints (auto-generating, spring, 6DoF) - Collisions Groups - Object Forces - Point Radius Forces - Delete Duplicity data - Instancing - Emitting system - Includes many example scenes for studying - Support for Windows(64bit), Linux(64bit) and OSX(64bit) Links: Houdini: www.sidefx.com LinkedIn: www.linkedin....Houdini-4796605 More author's videos: vimeo.com/user3251535 Create freely, simulate quickly and enjoy fully! Best wishes, Milan Suk Download BulletSOP v2.0.15 for Windows, Linux: http://bit.do/BulletSOP_v2_0_15
  16. Alright so i have been through plenty of posts on using constraint networks in case of packed RBD objects, but i still can't quite find a way to achieve this simple task - Two packed rbd objects (pre-fractured) - one has animation and is set to be a deforming static object, and the other is an active object. I need to pin few of the pieces of the active object to the deforming one. Glue and hard constraints work well for scenarios where the static object isn't deforming. But on deforming geometry, the objects stay constrained to their location and do not move with the animated points. I've also tried cone constraint which seems to make the active object follow the animation but is somewhat unstable, the pieces try to stick but wobble all the way. Not sure what would be the correct way to do this. Any insights on this if any of you guys have tried would be of great help!! GluePinTest.hipnc
  17. POP forces and Bullet sim

    Hi everyone. I've come across a little hurdle, that I'm sure must have a simple solution, but I can't quite figure it out. I've created a simple scene to illustrate what I'm after (see attached). Basically I'm using the POP Attract force to drive the animation of my RBD objects (I'm using the Bullet solver), and I'm getting the result that I'm after. My predicament now is that I want to vary the effect of the force on a per object level. So in reference to the example scene I've attached, have the torus objects be less effected by the attract force than the teapot objects. Like I said, I'm sure there must be a simple solution for this, and I'm hoping one of you clever people can point me in the right direction. cheers! bulletAttract.hip
  18. Wrecking Ball Constraint Question

    Hi! I've setup a simple scene with a wrecking ball with a chain hitting a brick wall. I've two constraints network a hard constraint that takes cares of most things and then a glue network that keeps the ball together (it's made up from two pieces). The brick just sits on each other and contains no constraints. Everything seems to work fine from the exception that the hard constraints starts to stretch (ie the chain starts to stretch) when the mass of the ball becomes too high. The only way I found to get around this is to increase the density of the chain to 10 times the ball. But it just doesn't look alright. Is there another constraint I should use instead of the hard constraint or is there a way I can increase the strength of the hard constraint without increasing the mass of the chain? Thanks! / John WreckingBall_Constraints_V01_01.hipnc
  19. Hello I have a fractured geometry and I want to glue lets say every 3 nearby pieces into one to create more interesting pieces. I also want to do that in a procedural way, so that I will be able to plug any fractured geometry and it would still work. I don't have an example file because I have no idea how to approach this.. Any ideas? Thanks.
  20. Hello everyone I have got a sphere activating fractured geometry by going through it. I am using a foreach node with a centroid expression inside to add point to each piece which is then activated by the sphere via attribute transfer. Then I am using a point expression on a activevalue in the DOP to activate the pieces by the colour that the sphere transfers to the points. I want to know how to make the pieces that activate stay activated forever without deactivating once the sphere is gone. Any ideas? Thanks. activate_pieces.hipnc
  21. BulletSOP 2.0.14

    BulletSOP is implementation of Bullet library (bulletphysics.org) inside SideFx Houdini (sidefx.com). It's a plugin for creating incredibly large rigid body simulations on average PC. The Tool is very powerful, flexible and speed is very impressive as well as memory footprint. The plugin is free and without limits! So you can create truly stunning massive simulations. BulletSOP is compiled for Houdini production builds. It includes many example scenes (beginner -> professional) which are probably the best learning resources. Main features: - Bullet RBD Solver - Support for multiple Broadphases, Constraints Solvers - Loading data from previous frame - Geometry decomposition (Tetrahedra, Voxels) - Static/Animation body - Convex Hull - Compound Hull - Deform static Hull - Primitive Hulls - Constraints (auto-generating, spring, 6DoF) - Collisions Groups - Object Forces - Point Radius Forces - Delete Duplicity data - Instancing - Emitting system - Includes many example scenes for studying - Support for Windows(64bit), Linux(64bit) and OSX(64bit) Links: Houdini: www.sidefx.com LinkedIn: www.linkedin....Houdini-4796605 More author's videos: vimeo.com/user3251535 Create freely, simulate quickly and enjoy fully! Best wishes, Milan Suk Download BulletSOP v2.0.14 for Windows, Linux and OSX: http://bit.do/BulletSOP_v2_0_14
  22. Hey everyone! I am trying to create a hailstorm effect with raining huge blocks of ice (hail). I set up a simple simulation where there is a grid and each frame a random point is selected and a hail is copied onto it, then with a sop solver it gets merged in. It all works, but after a few pieces, the simulation slows down drastically. They are packed and the DOP uses autofreeze, but still it's slow... Please somebody with experience look at it and tell me why? Thanks! Jegeso_001.hip
  23. Bullet Geometry Collision

    Hello fellows! I have a problem with Bullet Geometry Collision. Last few days i tried to fixed it. Now I don't have any idea why this error was happened.
  24. Hi Guys, I really need help with this. What I have is a complex Truck rig coming in from animation. Its got multiple moving parts and some parts need to break apart as it gets hit and collides with objects. I have managed to fracture the object and transfer the animation back onto the frags via a nice matrix transform setup I found on Odforce. The trouble I'm having is how to bring animated frags (packed primitives) into Dops and how to control them becoming active either on collision or at specific frames. The other thing I cant figure out is how to get the active pieces to be still glued or constrained to the other animating non active pieces. Presently I'm trying to achieve this with Packed Prims as I have alot of pieces and its lighter in Dops but I have tried doing it the old fashioned way with Deforming RBD Fracture objects, but I still have the problem of Controlling when objects become active and then constraining them to the non active animated pieces. The best way I could think to illustrate this is when the windscreen shatters its still constrained to the non active window frame so that it continues along with the moving truck. I have attached a super simple truck file that's been cleaned up off my tests, as none of them are working anyway. I would really appreciate any help anyone can give me on this, Its driving me crazy not being able to figure this out. Cheers.
  25. Hi guys, I am studying Peter Quint classes 'DOPs Force 1,2,3' When I tested it after watching, I found Bullet and Packed object doesn't work correctly, I don't know why. Whenever I take small force to geometries by an Uniform Force DOP, some objects or whole objects don't move anymore after 50 frame. Interestingly, all them work fine to the 50 frame. I think this is a complicated problem because I can make them work correctly by using RBD or giving high value of force or setting low density of mass or not using Uniform Force DOP(Gravity DOP works correctly). I want to use Bullet and Packed geometries. What's the problem and how can I solve this? I attatched my Houdini file. Thanks! test.hip
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