Real-Time Physics Simulation Forum

Box2D question

2007-02-18T22:38:43+00:00

Center of Masses distance should be less than or equal to some specified distance.

Statistics: Posted by samy — Sun Feb 18, 2007 10:38 pm

Box2D question

2007-02-18T12:07:15+00:00

Which problem it is:
1) Two fixed points distance is (==A, <=A, >=A );
2) Center of masses distance is (==A, <=A, >=A ) - special case of 1
3) "dynamic" situation - each frame find clesest points and make their distance (==A, <=A, >=A )
?

Statistics: Posted by TomaszZ — Sun Feb 18, 2007 12:07 pm

Box2D question

2007-02-18T05:27:57+00:00

Thanks for the reply. I have another question. I want to implement a simple distance constraint in the same style as the Box2D code. This constraint should prevent the distance between 2 rigid bodies from exceeding some chosen value. I don't want the constraint to effect the angular velocity of the bodies. Could someone give me a quick description of how to implement this using impulses?

Statistics: Posted by samy — Sun Feb 18, 2007 5:27 am

Box2D question

2007-02-18T17:15:14+00:00

Usually game characters have zero friction. If you would like to slow down your character, use some damping:

v *= damping_factor

where damping_factor is in [0,1].

Statistics: Posted by Erin Catto — Fri Dec 15, 2006 6:46 am

Box2D question

2006-12-14T23:46:03+00:00

I've been playing around with Erin Catto's Box2D code to see if I can adapt it for use in a platform beat-em-up I'm working on. I added support for circles and ellipses and everything is going very smoothly so far. However, I've run into problems with friction.
Imagine a long flat box representing the ground and a sphere representing the player. If the player runs along the ground and jumps, when he lands (the sphere collides with the box) he gets stuck for a second because of friction. I believe this is happening because of the accumulated normal impulse.
Any tips on what I could alter to prevent this from happening?

Statistics: Posted by samy — Thu Dec 14, 2006 11:46 pm