Real-Time Physics Simulation Forum

The upcoming Blender 2.40 release will have Bullet physics integrated. This release is scheduled for this week, so please visit http://www.blender.org This allows for physics keyframe baking for Blender animation/rendering and for some physics inside the game engine. You can use the following demos ...

Well I am glad that I did a bug repport but actually my test was using only cones/cylinders... I said convex because as much as I understand the cone/cylinder shape is converted to convex hull and passed to ODE in this form... When using Bullet's GJK with ODE, it will use the actual cone and cylind...

Here is a prototype convex-trimesh collision detection, integrating Bullet and ODE: http://www.continuousphysics.com/ftp/pub/test/index.php?dir=physics/source/&file=bulletode_trimesh_src.zip Open bullet\Extras\ode\VC6\Samples\MakeAllTests.sln (visual studio 7) and check out the demo test_convex_...

Apparently the demo adds the uninitialized vertices to the convex shape! You can fix this by replacing test_convex_trimesh.cpp line 283 from for (int k=0;k<VertexCount;k++) into for (int k=0;k<ConvexVertexCount;k++) Thanks for the bug report, and please tell if this fixes the convex-mesh. Erwin

Thanks for the paper. We did some related work, and also Gino van den Bergen described temporal use of the Sweep and Prune (SAP) space: For a single continuous queries you can add the Ray Cast and AABB Cast to the Sweep and Prune space like here: http://groups.google.com/group/comp.graphics.algorith...

In rigid body simulation contact solving, each step in the iterative scheme like Gauss Seidel requires the result from the previous step. This makes it difficult to parallelize. Jacobi method on the other hand can be easier implemented in parallel. A mix between Jacobi and Gauss Seidel, a kind of bl...

Thanks for the cool demo! There are lots of ways to improve stability in a physics engine, probably a faq would be best. But in the meanwhile, some notes: - Object that are in a constraint hierarchy (like connected by point 2 point constraints) can become instable when colliding with neighbours. Con...

http://www.blender.org/cms/Newsitem.607+M502350ac1be.0.html Download Blender 2.40 alpha2 here: http://www.blender.org/cms/Blender.31.0.html or a bug-fixed Win32 version locally: http://www.continuousphysics.com/ftp/pub/test/index.php?dir=blender/&file=blender2.40alpha2fixedraysensor.zip and play...

Some of the issues on the list should be fixed now, please try out this new binary (win32): http://www.continuousphysics.com/ftp/pub/test/index.php?dir=blender/&file=blender2.40alpha2fixedraysensor.zip erwin (Erwin Coumans) 2005/11/11 06:02:14 CET Modified files: blender/source/blender/src butto...

A new cvs checkout. This one comes with visual studio 6,7 and 8 project files, as well as the demos. Should compile out of the box. If not, please let me know. SOURCE CODE: http://www.continuousphysics.com/ftp/pub/test/index.php?dir=physics/source/&file=bullet.zip DOXYGEN: http://www.continuousp...

The preliminary source files are here: http://www.continuousphysics.com/ftp/pub/test/index.php?dir=physics/source/&file=bulletode_trimesh_src.zip open VC7 project: bullet\Extras\ode\VC6\Samples\MakeAllTests.sln The convex integration files are already in ode cvs, see http://cvs.sourceforge.net/v...

Yes, but: If you want to use Bullet with quake 2, you can best create a convex shape for each quake 'brush'. A quake brush is a convex shape bounded by a collection of planes. You can create a point representation, by calculating the intersection points of those planes. See an explanation for "...

need to calculate the collision radii of the two colliding OBBs

Could you provide some more information? What is this 'radii of two colliding OBBs' ? And what do you need this for?

If you need a bounding sphere radius for a single OBB, you can take the length of the half-extents.

Erwin

Hi, There is a draft integration ODE + Bullet integration here: http://www.continuousphysics.com/ftp/pub/test/index.php?dir=physics/&file=SourceCode_BulletWithOdeSampleIntegration.zip And a precompiled win32 demo here: http://www.continuousphysics.com/ftp/pub/test/index.php?dir=physics/&file...

Havok is planning to use the gpu and shadermodel 3 for some of their rigidbody calculations: http://www.havok.com/%20index.php?option=com_content&task=view&id=187&Itemid=77 Closest I can think of is http://wwwcg.in.tum.de/Research/Publications/UberFLOW Has anyone experience in this area,...