Wiki : NewtonBodyGetForce

[JernejL]

The page's NewtonBodyGetForce remarks says:
This function is only effective when called from NewtonApplyForceAndTorque callback

Is it true ? Is it really means when called not from callback return values are not valid ?

[JernejL]

Since this is the accumulated current force i assume it is not, but you should wait for Julio for a more exact answer.

[Julio Jerez]

that was 1.53

I thick in 2.0 there is getForceACC or something similar.
void NewtonBodyGetForceAcc(const NewtonBody* body, dFloat* vector);

some joint use that feature.

[JernejL]

that was 1.53

I thick in 2.0 there is getForceACC or something similar.
void NewtonBodyGetForceAcc(const NewtonBody* body, dFloat* vector);

some joint use that feature.

This returns current accululated force or for previous frame?

[Julio Jerez]

No, it is in the same frame, It gives the sum of all external forces applied to the body. (excluding teh recation forces).

for example The player controller use it to determine what forces are acting the body , tshi can make a player the can walk of round places, or even on an eviroment with a horizontal gravity.

Code: Select all

void CustomPlayerController::SubmitConstraints (dFloat timestep, int threadIndex)
{
   dFloat mag;
   dFloat angle;
   dFloat invIxx;
   dFloat invIyy;
   dFloat invIzz;
   dFloat invMass;
   dMatrix matrix0;
   dMatrix matrix1;
   dVector velocity;

   // save the gravity before collision force are applied
   NewtonBodyGetForceAcc (m_body0, &m_gravity[0]);
   NewtonBodyGetInvMass(m_body0, &invMass, &invIxx, &invIyy, &invIzz);
   m_gravity = m_gravity.Scale (invMass);
         ...
        ...