Real-Time Physics Simulation Forum

Dear Bullet friends, the Cafu Engine (formerly Ca3D-Engine) is now available to everyone as free software under the GNU General Public License! http://www.cafu.de/templates/firenzie/images/style4/logo-cafu.png The source code as well as precompiled binaries are available at our Downloads page, and t...

We're happy and proud to announce the latest release of the Ca3D-Engine: version 9.06 - June 2009 adds many new great features and enhancements to the Ca3D-Engine. The new version is available for Windows and Linux at the Ca3DE Downloads page. Overview • Features • News • Downloads • Gallery • Sour...

Argh!! I'm very sorry - my fault!
When I found the two different implementations of getAabb() in btTriangleMeshShape and btSoftBodyCollisionShape, blindness crept over me and I overlooked the call to btMatrix3x3::absolute() in the former.
My apologies!

Hi all, I have a question regarding various implementations of the btCollisionShape::getAabb() method (in Bullet 2.74). The documentation about this method says getAabb returns the axis aligned bounding box in the coordinate frame of the given transform t. However, some derived classes implement thi...

Hello all, I'm currently implementing the effect of explosions (and e.g. of bullets hitting crates) by applying impulse scaled by distance to objects in the vicinity of the explosion. It works very well, but I want to save computing the exact point in space where the objects are hit by the impact. D...

Dear Erwin, Can you help reproducing any of the problems, so we can fix them? Bullet should be able to deal with all those tasks (player control, volume triggers, ray tracing) reliably and fast. I will do my best to help to get these problems fixed, but in general, I fear that we will not be able to...

Hi Erwin, thank you very much for your reply and the links to the great papers! I've finished my implementation using explicit Minkowski difference in the meanwhile. As you mentioned, the disadvantages are scary O(...) asymptotic complexity, and very difficult for "rotational sweeps" (the ...

Oh, I forgot to mention that the challenge is of course to compute the bevel planes dynamically, in real-time, for arbitrary and changing (that is, possibly different in each frame) trace objects. Precomputing the explicit Minkowski sum ahead of time, e.g. by a convex hull algorithm for one fixed tr...

Dear folks, I've been comparing several algorithms for continuous collision detection between convex objects, and I was wondering how the algorithm that is used in the "Quake (1/2/3)" engines fits in. In a summary, the "Quake algorithm" traces AABBs along rays and determines coll...

Hi Erwin, thank you very much for your reply! Using fewer large btBvhTriangleMeshShape is best, but there is no problem having a few hundred to a thousand (1000) static triangle meshes. Typically each single btBvhTriangleMeshShape triangle mesh can contain from 1000 to millions of triangles. But the...

Hi rusty, thank you very much for your feedback! I think you should probably invest a few days in profiling the best method for your static collision. [...] Yes, this is what I'll do. I had hoped to reduce the number of test cases beforehand depending on your answers to my questions, but eventually ...

Hello all, we're currently integrating Bullet (currently using version 2.71) into our Ca3D-Engine . Bullet is awesome and it works very well so that we're making good progress, but as we're not (yet) familiar with all the Bullet implementation details, there is now the question which shapes are best...

sparkprime, thanks!!
So it seems like I'm using the Bullet API right, that's good to know.

Hi all! I'm new to Bullet, and this is my first post here. :) I've started to integrate it into the Ca3D-Engine , an all-purpose, modern 3D graphics engine and game development kit, and would like to let you know that Bullet is a great and excellent package, thank you all very much for it!! :-D Usin...