public void updateForce(MyParticle particle, float duration)
{
//checking if particle has infinite mass
if (!particle.hasFiniteMass())
{
return;
}
//calculates position of the particle relative to the anchor
MyVector3 position;
position = particle.getPosition();
position.SubtractVectorFromThisVector(this.anchor);
//Calculate constants and check whether they are in bounds
float gamma = 0.5f * Mathf.Sqrt(4 * springConstant - damping * damping);
if (gamma == 0.0f)
{
return;
}
MyVector3 c = position.multiplyVectorByScalarVR(damping / (2.0f * gamma)).returnAddVectorToThisVector(particle.getVelocity().multiplyVectorByScalarVR(1.0f / gamma));
//Calculate the target position
MyVector3 target = position.multiplyVectorByScalarVR(Mathf.Cos(gamma * duration)).returnAddVectorToThisVector(c.multiplyVectorByScalarVR(Mathf.Sin(gamma * duration)));
target.multiplyVectorByScalar(Mathf.Exp(-0.5f * duration * damping));
//Calculate resulting acceration and force
MyVector3 accel = (target.returnSubtractVectorFromThisVector(position)).multiplyVectorByScalarVR(1.0f / (duration * duration)).returnSubtractVectorFromThisVector(particle.getVelocity().multiplyVectorByScalarVR(duration));
particle.addForce(accel.multiplyVectorByScalarVR(particle.getMass()));
}
/*Updates force*/
/*
* void ParticleForceGenerator.updateForce (MyParticle particle, float duration){
*
* //check we don't have infinite mass
* if (!particle.hasFiniteMass())
* return;
* //app mass-scaled force to the particle
* particle.addForce(gravity.multiplyVectorByScalarVR(particle.getMass ()));
* }
*/
public void updateForce(MyParticle particle, float duration)
{
//ParticleForceGenerator.updateForce (particle, duration);
//check we don't have infinite mass
if (!particle.hasFiniteMass())
{
return;
}
//app mass-scaled force to the particle
particle.addForce(gravity.multiplyVectorByScalarVR(particle.getMass()));
}