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Showing results for tags 'physics'.
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Hey all! I was hoping to get some help figuring out a way to update the stiffness value of a vellum constraint geometry across the frames of its simulation. I can write an attribute wrangle like the one pictured and it will update the starting frame and the simulation bakes from there and plays as though the values werent changing at all, much less becoming negative. I tried dropping into the vellum solver and seeing if I could figure out anything in there but nothing seemed to work. Im still pretty new to houdini so I expect it to take some time but I was hoping to eventually take whats done in these two awesome videos and merge them into a project where a genetic algorithm produces tensegrities that update their stiffness over simulated time in order to deform in ways that cause them to (hopefully) roll towards a target. Hip file of the simplest version of the problem is attached in case it helps! Thanks for reading!!! VellumConstraintsHelp.hipnc
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Hi guys, does anyone know how to set up the solaris physics simulation for layout to be able put geometry inside another geometry? I tried to compute again the simulation proxy but it doesn't work. They show in the Solaris that it's possible so I am confused how to do it. Here is a gif image to better describe the situation.
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Helloooo just trying to make it so my hair doesn't have to fall into place every time i start the sim. Thanks!
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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!
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Hi guys, I'm kinda new to this software and this is my first post, after several days of trying to solve this problem: Am trying to simulation how stellar wind affects the gas clouds in interstellar space. https://www.spacetelescope.org/images/potw1106a/ (reference picture from Hubble) When new stars are born in high density regions, the ignition and radiation of these stars create winds that pushes the dust around them, sculpting away the surrounding molecular cloud. These winds can reveal this hidden star formation process and sometimes accelerate it, when this expansion compress another high density spots, this slowly collapsing cloud will form a new star. These places are also called stellar nurseries. So, i'm trying to visualice is the first parts of this process, the way stellar wind sculpts and reveal the clouds around them. I've modeled a random cloud to represent the very uneven density distribution. Where i'm having problem is in getting this "wind" to affect more the lowest density regions. I tried with a couple of fan forces in oposite directions and kinda worked, but could not get to work a mask using the density field, maybe is posible, but i couldn't do it. Then i tried a gas field wrangle to get a another velocity field "wind", from the origin and multiply it by a factor inverse to the density squared (see screenshot) This also kinda worked, but i get a very voxely looking render (video attached), maybe with a higher resolution and some blurring node somewhere could improve this. I also would like to achieve the effect that the winds is slowly expanding trough space (since the spatial scales here are huge), maybe i could bound it to an expanding sphere? (i dont like that the wind effect is instantaneous in all the scene) maybe some kind of raycast could be an option? i'm open to ideas, coz i don't even know how to begin to google that :/ That's what i've tried so far, would be really happy if someone could share some ideas or resources! Thanks in advance. pd1: another idea i would love to implement is to fake the dust colapse by gravity with some clumping also based on density (i tried with gasshred and gas surface tension with poor results) pd2: Eventually, i would like to get this expansion and subsequent peripheral density increase around to spark the birth of new stars. I don't know if is posible to create fuel from a certain density threshold or something like that. But that's a second post i guess. StarDust_07.hip StellarWind_Advect2_1.mp4
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Hi, I am an experienced Software Engineer with a good eye for Visual Effects. I have over more than 10 years of experience in developing advanced software systems for simulation and animation companies. In addition, I've invested that last 5 years exploring and educating myself all about Visual Effects. Below is my demo reel. Please check https://www.linkedin.com/in/khaledabdelhay for more details on my technical/artistic skillset.
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Hello Community, Been looking and exploring nodes for a while now and I cannot find the answer to this problem. How to apply a force to an object in it's own local frame so even when I do rotate that object, the force is applied let's say in the y axis. To give you guys some context, I want to model a quadrotor, and have the guy have 4 propellers in which I want to put uniform forces to each of them to drive a point in the quadrotor. Then, by modifying the values of the propellers, I could eventually model it's yaw, pitch and roll with just forces and torques. But all the force nodes I seem to explore are in the GLOBAL frame and you apply it to the absolute y of Houdini and not to it's local y. Any idea how I can solve this?? Thanks a lot once again! Francisco.
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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 v2.0.13 for Windows, Linux and OSX: http://bit.do/BulletSOP_v2_0_13
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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) and Linux(64bit) - Support for Houdini 12 & 13 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 v2.0.12 for Windows and Linux here: http://bit.do/BulletSOP_v2_0_12
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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) and Linux(64bit) - Support for Houdini 12 & 13 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 v2.0.11 for Windows and Linux here: http://bit.do/BulletSOP_v2_0_11
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Show what you made with BulletSOP !!! I'm creating this thread because I see that there is more and more R&D videos(mainly on vimeo) and In 2014 We can expect few great movies where artist's using BulletSOP push a limits of VFX. Of course these studio's will release breakdown's after these movie's hit Blue-ray!
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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) and Linux(64bit) - Support for Houdini 12 & 13 Links: Houdini: http://www.sidefx.com/ LinkedIn: http://www.linkedin....Houdini-4796605 More author's videos: https://vimeo.com/user3251535 Create freely, simulate quickly and enjoy fully! Best wishes, Milan Suk Download BulletSOP v2.0.10 for Windows and Linux here: http://bit.do/BulletSOP_v2_0_10
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There is no better way how to start the New year than smoke your GPU BulletSOP 2.5 preview features implementation of WIP Bullet Library 3.0 with OpenCL(CPU/GPU) support. Please keep in mind that this version supports only fraction of BulletSOP features and It's only for testing and highly unstable! For OpenCL settings, check btSolver node -> Advanced tab! You can activate "old" CPU solver(which has some bugs unlike BulletSOP 2.0.10) and compare result and speed. Testing scene includes 80K boxes(of course you can try to go higher - change settings on OpenCL tab). And If you want to publish some result(s) it's better to restart Houdini(clean memory) before running final simulation. So Let's try it and let us know about your results! Best wishes, Milan Suk BulletSOP binary is free of charge, but You can make a donation and help keep the project running. It's up to you! Download BulletSOP v2.5 preview for Windows(compile on Houdini 13.0.260): bit.do/bulletsop_2_5_preview PS: This is my result on 3 years old GPU!
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The new v2.0.9 comes with a lot of speed and layout improvements, fixed bug and new emitting system! 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! 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. Free video tutorials are coming soon! 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) and Linux(64bit) Links: Houdini: http://www.sidefx.com/ Introduction: https://vimeo.com/67030933 LinkedIn: http://www.linkedin....Houdini-4796605 More author videos: https://vimeo.com/user3251535 Create freely, simulate quickly and enjoy fully! Best wishes, Milan Suk Note: Keep in mind that You need Houdini 12.5.469 build! With older or later versions I can't guarantee functionality! BulletSOP_2_0_9__houdini_12_5_469.zip
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Hi, In attachment you can find fully featured BulletSOP 2.0 beta v5! BulletSOP is implementation of Bullet library 2.8(bulletphysics.org) inside SideFx Houdini. Its a plugin for creating incredible rigid body simulations. Primary it is single-thread application, but speed is very impressive. Memory footprint as well. The most important features of this release is that Its free and without limits(until now up to 5000poly objects). So now you can create real stunning massive simulations. This version is for Windows(64bit), Linux(64bit, gcc4.4) and Mac OSX(10.7), but OSX version is not stable on my system In attachment you can find example file with a lot of scenes, which are which propably the best learning resources at this moment. There is old tutorial(https://vimeo.com/57198443) for alpha version as well. I will make more tutorials for every node. And remember "Details view" is your best friend!!! Changes: - added motion blur output + example scene - faster Delete duplicity for constraints(2.6M constr. take only 4s) - fixed btLoader - added % info to btModify - few optimalization in btTransform Added new scenes: - building collapse scene(falling floor) - building scene with "snake" - high poly interior details on voronoi pieces - transform soft ropes with rigid bodies - added and changed few others examples LinkedIn group: http://www.linkedin....Houdini-4796605 Sneak Peek(alpha version): https://vimeo.com/57193837 Some info about this project: http://www.sidefx.co...wtopic&p=127978 Please, If you are interested in this project, take one minute of your time and fill this survey: http://obsurvey.com/...C4-71248188D81C Regards, Milan Suk EDIT: The latest beta v6: http://forums.odforce.net/index.php?/topic/17640-bulletsop-20-beta-v6/ BulletSOP_2_beta_v5.zip
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Hi, In attachment you can find BulletSOP 2.0 beta v6! It's probably last beta. Official 2.0 version is coming. BulletSOP is implementation of Bullet library 2.81(bulletphysics.org) inside SideFx Houdini. It's a plugin for creating incredible rigid body simulations. Primary it is single-thread application, but speed is very impressive. Memory footprint as well. The plugin is free and without any limits! So you can create true stunning massive simulations. This version is for Windows(64bit), more are coming soon. In attachment you can find example file with a lot of scenes, which are probably the best learning resources at this moment. For more info you can check my videos: https://vimeo.com/user3251535 I'm making more tutorials soon. And remember "Details view" is your best friend!!! In this release I mostly concentrated on object parenting and exploding convex and concave objects, because I received many question about that. Now It work properly! Changes: - added initial rotation for objects - added compound object(object parenting) - prepare node has many new features(padding, decomposition, ...) - fixed few bugs - ... LinkedIn group: http://www.linkedin....Houdini-4796605 Some info about this project: http://www.sidefx.co...wtopic&p=127978 Regards, Milan Suk EDIT: The latest BulletSOP 2.0.7 - http://forums.odforc...-bulletsop-207/ BulletSOP_2_beta_v6.zip
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Hi, In attachment you can find 2nd public beta version for BulletSOP 2.0. This version is for Linux and Windows. OSX is coming soon. I fixed few small problems and mainly I added 2 new scenes with building collapse! More info about this project: http://forums.odforc...a-v3-for-win64/ Now the worse part. I spent a lot of time on this and I have to make a living, so If we want to keep this project alive, I need to make it commercial. So please, take one minute and fill this survey: http://obsurvey.com/...C4-71248188D81C Regards, Milan Suk EDIT : The latest beta v5: http://forums.odforc...sop-20-beta-v5/ bulletSOP_beta_v4_win64.zip bulletSOP_beta_v4_linux64_gcc4_4.tar.gz
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Hi, I want to introduce bulletSOP 2.0, which is new version of bullet implementation inside Houdini(surface network) for stunning rigid body simulations! It is based on Bullet phyics library 2.8. Primary is single-thread application, but speed is very impressive. On solver node is few option for multi-thread running, but its not so stable. When Bullet phyics library 3.0 will come, I will modify for GPU running of course In Attachment is fully featured beta version, There is only one limitation, you can create max. 5000 poly objects. There is no limits for other hulls(box, tubes, ...)! Full version will be completely without limits. For learning you can check this old tutorial(https://vimeo.com/57198443), but its for alpha version, so many things are different(better, easier). In attachment you can find example file with a lot of scenes(including sneak peek) which are propably best resources at this moment. I will make tutorials for every node as soon as possible. And remember "Details view" is your best friend!!! This is version only for windows 64bit. I will release Linux and OSX version in next few days! If you have problem to run this plugin on windows or its crashing, please write here. Othrewise with other problems, create new thread. LinkedIn group: http://www.linkedin....Houdini-4796605 Sneak Peek: https://vimeo.com/57193837 Some info about this project: http://www.sidefx.co...p=127586#127586 Regards, Milan Suk EDIT : I see that downloads of this old beta still increasing, so please go here and download the latest beta: bulletSOP_beta_v3.zip
