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Bullet presentation @ GDC Austin, Monday September 15th 2008


  • Developing Games with Open Source Technologies: Full-day Tutorial
  • Monday, September 15th Austin Convetion Center, Room 9C
  • 11:00am – 11:50am: Tumbling, falling and breaking: Bullet open source, professional physics engine

Open source technologies bring cutting edge innovation, source code accessibility, rich community support, and a pricetag that can’t be beat to developers in every industry — including the online game industry. In this one day mini-track you will learn first hand from leading game developers and technology providers about open source game engines, tools, and server technologies that are changing the economics of online game development today.

Bullet 2.71 released: Disney Maya Plugin, CUDA experiments

Download here

Apart from numerous bug fixes, this is new:

  • Walt Disney Studios contributes their in-house Dynamica Maya Plugin for Bullet physics simulation.
  • Check out the Dynama Maya Plugin instruction videos.
  • This Dynamica Plugin is used in Disney’s upcoming 3D animated movie Bolt, for example in the peanuts shot below.
    Thanks to Nicola Candussi and Arthur Shek from Disney for this contribution!
  • Several bug fixes and contributions related to inertia tensor, memory leaks etc.
    Thanks to Ole K and several other contributors.
  • Added btCudaBroadphase in Extras/CUDA: some preliminary research into accelerating Bullet using CUDA.
    Thanks to the particle demo from the NVidia CUDA SDK.
  • Updated CDTestFramework, with latest version of OPCODE Array SAP. See Extras/CDTestFramework
    Thanks to Pierre Terdiman for the update
  • ForkLiftDemo has been finished, finally!
  • Improved performance for btDbvtBroadphase.
    Thanks to Nathanael Presson again, for all his work.


OLPC Physics Game Jam

OLPC is hosting a Physics Game Jam in Boston from August 29 to 31.

This is a team based rapid game development competition based on creating a physics game for OLPC XO laptops in 48 hours. Remote entries are allowed, and there will be prizes for the winners. PyBox2D is the main physics library that will be used, but anything open source that will run on the XO is fine.

There will be programming workshops such as developing in Sugar, using PyBox2D, and integrating computer vision with physics, so prior experience is not a requirement.

There is more information on the OLPC Wiki:

Registration is free, but donations are encouraged:

Bullet @ SIGGRAPH 2008

We are visiting SIGGRAPH again next week.

Some of the Bullet/physics related activities:

  • There will be a Bullet presentation at the Sony booth #521 (exhibition hall) Tuesday, Wednesday and Thursday from 14.15-14.45.
  • We will do a short COLLADA Physics presentation at the COLLADA BOF, Thursday, 14 August | 4:00 pm – 6:00 pm | LACC – Room 511A.
  • And present about Bullet integration in Blender at the Blender BOF, Monday August 11, ~3-4 PM, Convention Center room 501A
  • Some physics enthousiasts will gather on Wednesday after the Jiggly Fluids session (at the exit door), around 6.30PM.

Hope to meet you there,

Bullet 2.70 released

Bullet 2.70 physics SDK is available for download now.

Bullet 2.70 bunny car

Some new Features

  • First version of kinematic character controller (non-rigid body). See Demos/CharacterDemo
  • Improved soft body collision detection, using convex clusters. Thanks to Nathanael Presson.
  • Added btMultimaterialTriangleMeshShape, see MultiMaterialDemo
    Thanks to Alex Silverman for the contribution
  • Performance improvements for btDbvhBroadphase, and basic textures/shadow support, thanks to Nathanael Presson
  • Havok .hkx to COLLADA Physics .dae file conversion, see hkx2dae
  • Various bugfixes, thanks everyone for reporting!

Feedback is welcome in the forum.


Bounce, Tumble and Splash book is out

Tony Mullen reported that his new book Bounce, Tumble and Splash! Simulating the Physical World with Blender (Sybex) is out:

“The book covers all of Blender’s simulation functionality in depth including fluid, soft body, cloth, rigid body, particles, hair and much more. This is the first time much of this functionality has been documented in print, so I really hope that the book will help to give these powerful features a much wider audience.

I took a bunch of snapshots to give people an idea of how the books look inside and out, and you can check those out here:

There’s also a teaser on YouTube I put up some time ago. By all means take a look to get an even better idea of what this book covers:

The book’s in stock at Amazon:

I hope you enjoy the book!


Bounce tumble splash cover

Bullet 2.69 Physics SDK released: split impulse, tear & pick Cloth and Soft Bodies

[youtube exss517n1I0]

+ Added split impulse support, penetration recovery won’t add momentum
+ cloth/soft body improvements: picking (pick and drag), tearing (click and release without mouse move), preliminary support for btSoftBody versus compound and concave trimesh
+ Added new btDbvtBroadphase, based on dynamic AABB tree. It has the capability to do view frustum culling and front-to-back traversal. See Extras\CDTestFramework for view frustum culling sample.
+ Enabled new btGjkEpa2 penetration depth solver, thanks to Nathanael
+ Provide access to all persistent manifolds for a given btBroadphasePair, see CharacterDemo for sample usage
+ Added linear and angular motor for btSliderConstraint
+ Add penetration depth test for convexSweepTest
+ removed several warnings for Windows build, thanks to Martijn Reuvers
+ Added Mac Cocoa Xcode project, thanks to TomorrowPlus
+ use collision margin of btBvhTriangleMeshShape for convexTest, Thanks to reltham for the contribution.
+ added custom memory allocator registration, thanks to Sly.

Download Bullet 2.69 from the Bullet repository at Google Code.

Bullet 2.68 Physics SDK released: Soft Bodies and iPhone support

+ New BulletSoftBody library: cloth, rope and deformable volumes, including interaction with rigid bodies. Thanks Nathanael Presson.
+ Added btSliderConstraint
+ Added Extras/CdTestFrameWork, Thanks Pierre Terdiman
+ Added posix thread support (pthreads), Thanks Enrico.
+ Moved ConvexHull into Bullet/src
+ Moved optional quickstep and box-box collision detector to Bullet/src. Thanks Russell Smith for permission to re-distribute under the ZLib license.
+ Many bugfixes and improvements to BulletColladaConverter, btSubsimplexConvexCast, btMultiSapBroadphase, btOptimizedBvh

Download full SDK source code and precompiled Windows and Mac OSX Universal binary demos from

Wolfgang Engel developed the Oolong Engine 2 for iPhone, and initial Bullet support looks very promising. Unlike most other phones, the floating point performance of the iPhone is very good.
[youtube _8h8yqcTdn8]
Thanks everyone for the hard work and feedback,