public override void Collide(CollisionEvent coll, PlayerPhysics physics)
{
var ball = coll.Ball;
// make sure we process each ball/ball collision only once
// (but if we are frozen, there won"t be a second collision event, so deal with it now!)
if ((physics.SwapBallCollisionHandling && ball.Id >= _id ||
!physics.SwapBallCollisionHandling && ball.Id <= _id) && !_state.IsFrozen)
{
return;
}
// target ball to object ball delta velocity
var vRel = ball.Hit.Vel.Clone().Sub(Vel);
var vNormal = coll.HitNormal;
var dot = vRel.Dot(vNormal);
// correct displacements, mostly from low velocity, alternative to true acceleration processing
if (dot >= -PhysicsConstants.LowNormVel)
{
// nearly receding ... make sure of conditions
if (dot > PhysicsConstants.LowNormVel)
{
// otherwise if clearly approaching .. process the collision
return; // is this velocity clearly receding (i.E must > a minimum)
}
//#ifdef PhysicsConstants.Embedded
if (coll.HitDistance < -PhysicsConstants.Embedded)
{
dot = -PhysicsConstants.EmbedShot; // has ball become embedded???, give it a kick
}
else
{
return;
}
//#endif
}
// fixme script
// send ball/ball collision event to script function
// if (dot < -0.25f) { // only collisions with at least some small true impact velocity (no contacts)
// g_pplayer->m_ptable->InvokeBallBallCollisionCallback(this, pball, -dot);
// }
//#ifdef PhysicsConstants.DispGain
var eDist = -PhysicsConstants.DispGain * coll.HitDistance;
var normalDist = vNormal.Clone().MultiplyScalar(eDist);
if (eDist > 1.0e-4)
{
if (eDist > PhysicsConstants.DispLimit)
{
eDist = PhysicsConstants.DispLimit; // crossing ramps, delta noise
}
if (!_state.IsFrozen)
{
// if the hit ball is not frozen
eDist *= 0.5f;
}
ball.State.Pos.Add(normalDist); // push along norm, back to free area
// use the norm, but is not correct, but cheaply handled
}
eDist = -PhysicsConstants.DispGain * Coll.HitDistance; // noisy value .... needs investigation
if (!_state.IsFrozen && eDist > 1.0e-4)
{
if (eDist > PhysicsConstants.DispLimit)
{
eDist = PhysicsConstants.DispLimit; // crossing ramps, delta noise
}
eDist *= 0.5f;
_state.Pos.Sub(normalDist); // pull along norm, back to free area
}
//#endif
var myInvMass = _state.IsFrozen ? 0.0f : InvMass; // frozen ball has infinite mass
var impulse = -(1.0f + 0.8f) * dot / (myInvMass + ball.Hit.InvMass); // resitution = 0.8
if (!_state.IsFrozen)
{
Vel.Sub(vNormal.Clone().MultiplyScalar(impulse * myInvMass));
}
ball.Hit.Vel.Add(vNormal.Clone().MultiplyScalar(impulse * ball.Hit.InvMass));
}
