Search found 48 matches

by bwelch
Tue Jun 24, 2014 2:16 pm
Forum: General Bullet Physics Support and Feedback
Topic: [JBULLET] Axes on BTGeneric6DofConstraint and lock/unlock ?
Replies: 23
Views: 7152

Re: Set the axes on BTGeneric6DofConstraint and lock/unlock

I was very confused when learning constraints as well due to the FrameInA and FrameInB stuff. If you do a forum search there are a few threads that go into detail about them, but really as these other guys have said, the ConstraintDemo is the best place to go to learn. I suggest starting with a hing...
by bwelch
Tue May 27, 2014 6:48 pm
Forum: General Bullet Physics Support and Feedback
Topic: Dynamic surface friction
Replies: 1
Views: 1567

Re: Dynamic surface friction

So without knowing any of the details of your setup and being pretty much a beginner to Bullet, I probably can't be of much help, but my kneejerk reaction is that for each wheel (or other object that you expect to undergo dynamic friction), you check the material of the surface that the rigid body i...
by bwelch
Tue May 27, 2014 6:40 pm
Forum: General Bullet Physics Support and Feedback
Topic: Complete Newbie
Replies: 7
Views: 3017

Re: Complete Newbie

Definitely check out the demos and manual as stated above. You might also want to check out these videos. They can be a bit difficult to understand at times, but I found them useful for learning some basics of Bullet.

https://www.youtube.com/watch?v=wbu5MdsFYko
by bwelch
Thu May 08, 2014 2:02 pm
Forum: General Bullet Physics Support and Feedback
Topic: error during building sources
Replies: 8
Views: 4376

Re: error during building sources

I installed freeglut a few months ago out of curiosity because I wanted to see the ForkLiftDemo work. I don't need glut with Bullet for my purposes, so I'm afraid I don't remember the details of the setup. But upon examining my file structure, it looks like I have freeglut installed right on my C: d...
by bwelch
Mon May 05, 2014 7:55 pm
Forum: General Bullet Physics Support and Feedback
Topic: Debug draw Aabbs moving in a different direction
Replies: 4
Views: 4033

Re: Debug draw Aabbs moving in a different direction

Did you check to see if your display uses the same axes as Bullet? In Bullet, the vertical axis is Y by default. If you got Y and Z mixed up, it could cause this sort of problem.
by bwelch
Fri Apr 18, 2014 2:14 pm
Forum: General Bullet Physics Support and Feedback
Topic: RayTest simple issue
Replies: 4
Views: 1933

Re: RayTest simple issue

I believe a "clear" quaternion would be btQuaternion(0,0,0,1), not btQuaternion(0,0,0,0).
by bwelch
Fri Apr 18, 2014 2:03 pm
Forum: General Bullet Physics Support and Feedback
Topic: Isolating vertex of rigid body cube
Replies: 2
Views: 1888

Re: Isolating vertex of rigid body cube

Seems like there would be an easy way to grab that from Bullet, but I don't know of a way. If you know the dimensions of the cube, you can get the position of the cube and the orientation and use those to determine the vertices, I suppose.
by bwelch
Fri Apr 18, 2014 1:42 pm
Forum: General Bullet Physics Support and Feedback
Topic: Where to start
Replies: 6
Views: 2316

Re: Where to start

This tutorial series was the most helpful in getting me on my way to learning the basics, along with the demos, of course.

https://www.youtube.com/watch?v=wbu5MdsFYko
by bwelch
Fri Apr 18, 2014 1:39 pm
Forum: General Bullet Physics Support and Feedback
Topic: Ball Physics not working as expected
Replies: 2
Views: 2291

Re: Ball Physics not working as expected

For some reason your plot isn't showing for me. Anyway, I'm not sure if this will do anything for you, but IIRC there's a line in the demo about anisotropic rolling friction. Maybe try commenting that out?
by bwelch
Fri Apr 18, 2014 1:25 pm
Forum: General Bullet Physics Support and Feedback
Topic: error during building sources
Replies: 8
Views: 4376

Re: error during building sources

You don't *need* glut to build many of the demos. You probably left the Use Glut box checked when you didn't have it. You can either re-build and leave the box unchecked, or get freeglut.
by bwelch
Tue Apr 01, 2014 4:27 pm
Forum: General Bullet Physics Support and Feedback
Topic: [Solved] Accessing the world via a rigid body
Replies: 1
Views: 1406

Re: Accessing the world via a rigid body

I managed to figure out a way to access the world, and it turns out it was easy. It was more of a C++ thing than a Bullet thing. In my case, Bullet lives in a separate class called BulletPlugin, so I was able to access the world by using BulletPlugin::world. No need to go through the rigidbody to ge...
by bwelch
Tue Apr 01, 2014 3:46 pm
Forum: General Bullet Physics Support and Feedback
Topic: [Solved] Accessing the world via a rigid body
Replies: 1
Views: 1406

[Solved] Accessing the world via a rigid body

Hi everyone. I have what I think is an easy question, but I can't seem to find a solution. Is it possible to get a pointer to the world that a rigid body lives in from that rigid body? I was looking for something like rigidbody->getWorld() but there doesn't seem to be anything like that. In my proje...
by bwelch
Fri Mar 28, 2014 1:31 pm
Forum: General Bullet Physics Support and Feedback
Topic: applyCentralImpulse bug
Replies: 2
Views: 1821

Re: applyCentralImpulse bug

Is your box activated? If it's stationary for a while, Bullet will deactivate it and it won't be moved even if you apply an impulse to it. Try doing rigidBody->setActivationState(DISABLE_DEACTIVATION).
by bwelch
Mon Mar 10, 2014 9:22 pm
Forum: General Bullet Physics Support and Feedback
Topic: Restarting the Simulation?
Replies: 2
Views: 1610

Re: Restarting the Simulation?

I guess it depends on how you're using Bullet. I believe in many of the demos, they use an InitPhysics() and ExitPhysics() function, and I think spacebar is tied to them to reset the simulation. You might want to check there for inspiration.
by bwelch
Mon Mar 03, 2014 3:43 pm
Forum: General Bullet Physics Support and Feedback
Topic: output not shown with bullet physics library
Replies: 10
Views: 3992

Re: output not shown with bullet physics library

even I tried with the code of Helloworld from this site http://bulletphysics.org/mediawiki-1.5.8/index.php/Hello_World but the output window blinks and disappears. Try putting int x; std::cin >> x; somewhere after the output is supposed to display. It'll prevent the output window from disappearing ...