Bullet physics engine, how to freeze an object?

physics game-physics bullet
sunside picture sunside · Jun 10, 2010 · Viewed 13.6k times · Source

Using Bullet 2.76 I'm trying to freeze an object (rigid body) so that it instantly stops moving, but still responds to collisions.

I tried setting it's activation state to DISABLE_SIMULATION, but then it's virtually nonexistent to other objects. Furthermore, if objects "collide" with it when it's disabled, strange things begin to happen (object's falling through static bodies, etc.)

I suppose, temporarily converting it to a static rigid body could work, but is there an existing "native" way to achieve this on Bullet's side?

Edit: Is there a way to turn off gravity for a specific object?

Answer

Staffan picture Staffan · Jul 7, 2010

The documentation is a bit lacking but one would assume that the method below could be used to disable gravity on a specific body:

void btRigidBody::setGravity(const btVector3 &acceleration)

Related questions

iOS 7 Sprite Kit freeing up memory

I am building an iOS game aimed for the new iOS 7 and Sprite Kit, using emitter nodes and physics to enhance gameplay. While developing the app, I ran into a serious problem: you create your scenes, nodes, effects, but when …

Read More
How to fix circle and rectangle overlap in collision response?

Since in the digital world a real collision almost never happens, we will always have a situation where the "colliding" circle overlaps the rectangle. How to put back the circle in the situation where it collides perfectly with the rectangle …

Read More
Why is Verlet integration better than Euler integration?

Can someone explain to me why Verlet integration is better than Euler integration? And why RK4 is better than Verlet? I don't understand why it is a better method.

Read More