Search found 14 matches

by Hanz
Thu Dec 11, 2008 4:57 am
Forum: General Bullet Physics Support and Feedback
Topic: Bug report: Overflow in AABB (CharacterDemo.exe)
Replies: 3
Views: 3432

Bug report: Overflow in AABB (CharacterDemo.exe)

Hey When I was playing with ReleaseCharacterDemo.exe, the demo reported "Overflow in AABB, object removed from simulation." OS: Winxp + SP3 Evn: VisualStudio 2008 Bullet version: 2.73 sp1 The error can be reproduced by : 1. Start the ReleaseCharacterDemo.exe 2. Shoot several dynamical objects by "."...
by Hanz
Mon Nov 10, 2008 12:23 pm
Forum: Links, Papers, Libraries, Demos, Movies, Comparisons
Topic: Physics engine list, books, PhD thesis, on-line resources
Replies: 10
Views: 90982

Re: Physics engine list, books, PhD thesis, on-line resources

Just add some resources to this great list. :) 1 OpenHRP 3 : An integrated simulation platform for robot dynamics URL: http://www.openrtp.jp/openhrp3/en/index.html License: Eclipse Public License Brief introduction: * Dynamics: Featherstone algorithms * Collision detection: Opcode * Constraint solve...
by Hanz
Wed Jul 02, 2008 9:10 am
Forum: Links, Papers, Libraries, Demos, Movies, Comparisons
Topic: Mesh - mesh collision detection in OPCODE
Replies: 4
Views: 11676

Re: Mesh - mesh collision detection in OPCODE

If I understand your question correctly, for contact between, say obj1 and obj2, you want to get the collision triangles in both objects. Right? Then it is not that difficult. Here is the main procedure: // suppose you have set up the collision environment for obj1 and obj2 bool IsOK = Collider.Coll...
by Hanz
Sun Dec 09, 2007 2:24 pm
Forum: General Bullet Physics Support and Feedback
Topic: Problem linking against installed bullet lib on Ubuntu
Replies: 9
Views: 3658

Re: Problem linking against installed bullet lib on Ubuntu

Hmmm, the only real difference I can find between your Makefile and my Makefile is that you compile the whole project with one command, and I compile the object files first and link them afterwards. No, please check your link option's position in your build rules. The following output is strange. c...
by Hanz
Thu Dec 06, 2007 8:23 am
Forum: General Bullet Physics Support and Feedback
Topic: Problem linking against installed bullet lib on Ubuntu
Replies: 9
Views: 3658

Re: Problem linking against installed bullet lib on Ubuntu

It seems they are not included in the project, anyone with Ubuntu / pkg-config experience can help? Thanks, Seems Ubuntu(Gutsy Gibbon), pkg-config and bullet are irrelative. I just built the ConcavePhysicsDemo without any problem. 1. Copy source for the demo to a new directory. 2. Copy the necessar...
by Hanz
Mon Nov 12, 2007 4:41 am
Forum: General Bullet Physics Support and Feedback
Topic: Robot simulation and motor control
Replies: 0
Views: 1269

Robot simulation and motor control

In my simulator I need to control the trajectories of the joints based on my path planning algorithms. I want to know how to do it using Bullet. Following are the necessary context and problem statement. Context: 1. My simulation model (say, a mobile robot) consists one mobile root link and other li...
by Hanz
Tue Oct 09, 2007 10:55 am
Forum: General Bullet Physics Support and Feedback
Topic: Installing on Linux
Replies: 4
Views: 2641

Re: Installing on Linux

RaulHuertas wrote:Any ideas?
I built Bullet libraries and demo examples without any problem.
I did not read the manual but the following steps work for me.

0. Move to the Bullet root directory.

1.

Code: Select all

./configure
2.

Code: Select all

jam
3.

Code: Select all

sudo jam install
That's all.

HTH
by Hanz
Wed Jun 06, 2007 11:25 am
Forum: General Bullet Physics Support and Feedback
Topic: [Bug Report] Base class does not have virtual destructor
Replies: 0
Views: 1382

[Bug Report] Base class does not have virtual destructor

There is really a minor bug: In btGIMPACTMeshShape.h, we have following class definition: class BT_GIMPACT_TRIMESH_DATA_HANDLE_ARRAY: public btAlignedObjectArray<BT_GIMPACT_TRIMESH_DATA_HANDLE> { public: }; However, the base template class btAlignedObjectArray's destructor is not virtual. Usually it...
by Hanz
Tue Jun 05, 2007 2:06 am
Forum: General Bullet Physics Support and Feedback
Topic: Concave trimesh contact points reduction
Replies: 5
Views: 4421

Could you give more details about what exactly not works in 'almost works' ? Sorry for my poor wording... I will try to explain the problem. When I run the MovingConcaveDemo, I found that if I shoot the concave mesh several times within a short time (push "." key quickly ), then the meshes will be ...
by Hanz
Mon Jun 04, 2007 7:52 am
Forum: Research and development discussion about Collision Detection and Physics Simulation
Topic: Impulse based collision response and featherstone constraint
Replies: 3
Views: 4676

Thanks for point me about that, but I failed to find any related post in the above link. And I searched " iterative LCP" and I got quite a few links and I am not sure which one you are referring to. Would you please post the link again? EDIT: I think the following page is the one Erwin quoted: Equi...
by Hanz
Mon Jun 04, 2007 6:39 am
Forum: General Bullet Physics Support and Feedback
Topic: Concave trimesh contact points reduction
Replies: 5
Views: 4421

You can use multiple contact manifolds for concave versus concave: The optional GIMPACT integration in Bullet uses an array of contact manifolds. See MovingConcaveDemo, and Bullet/Extras\GIMPACTBullet\btConcaveConcaveCollisionAlgorithm.cpp Erwin Thank you for the pointer, but I checked them before ...
by Hanz
Mon Jun 04, 2007 5:58 am
Forum: Research and development discussion about Collision Detection and Physics Simulation
Topic: Impulse based collision response and featherstone constraint
Replies: 3
Views: 4676

Thank you for your reply... Using Featherstone in combination with contact resolution using 1. LCP-solver based method 2. Impulse based method Impulse bases method are equivalent to an iterative LCP method called SOR PGS (**). Erwin Thanks for point me about that, but I failed to find any related po...
by Hanz
Mon Jun 04, 2007 4:49 am
Forum: General Bullet Physics Support and Feedback
Topic: Concave trimesh contact points reduction
Replies: 5
Views: 4421

Concave trimesh contact points reduction

Is there any standard way to do contact points reduction for concave triangle meshes? In my simulator, the board-phrase/middle-phrase collision module can provide me the overlapped triangle pairs, and my problem is how to find the reasonable/reduced contact points for further collision response (I w...
by Hanz
Mon Jun 04, 2007 4:27 am
Forum: Research and development discussion about Collision Detection and Physics Simulation
Topic: Impulse based collision response and featherstone constraint
Replies: 3
Views: 4676

Impulse based collision response and featherstone constraint

Hey, I am now trying to build a robot simulator and I have question about applying impulse based collision response to the featherstone ABA algorithms. Yes, I need featherstone ABA because in my simulation I need the accurate joint states, and the drifting caused by numeric error should be avoided. ...