Disabling response for one of the colliders

[Crashy]

Hi,
I would like to do a tricky thing: I have two dynamic objects A and B colliding, but when colliding, I would like object B to be affected only by it's own forces, not by the collision response.
More clearly, I would like object B not to be affected when object A collide it.

Is this even possible to do?

thanks.

[Julio Jerez]

you could do that by making object A kinematic object with mass. but you have to integrate yourself


integration the force and torque for a kinematic body is easy , you read the force and torque, and divide by the time step
an then you call this function to canculate the new velocity

Code: Select all

void NewtonBodyApplyImpulsePair (const NewtonBody* const body, dFloat* const linearImpulse, dFloat* const angularImpulse);

to calculate the new position and orientation is more trick because as the body move it inertia change, but the newton API provide this function for that.

Code: Select all

void NewtonBodyIntegrateVelocity (const NewtonBody* const body, dFloat timestep);

the import part is to make the body that you do no wan to be change by the engine solver, a Kinematic body with mass. this has the effect that the engine see it as a static body with non zero mass.
This means it is part of the collsion and all force calcutations calculations by it is not integrated.

[Crashy]

Thank you very much, I'm going to test that.