private float GetPenDistance(BallisticMaterial bMaterial, float bulletVelocity, float dragCoefficient)
{
var vthr = Mathf.Sqrt(2 * bMaterial.yieldStrength /
(dragCoefficient * (bMaterial.density * 1000)));
var xc = (_massGram / _area) * (1 / (dragCoefficient * bMaterial.density));
return(xc * Mathf.Log(1 + Mathf.Pow(bulletVelocity / vthr, 2)));
}
private bool CheckForRicochet(BallisticMaterial ballisticMaterial, float penDistance, float angle)
{
var sd = bulletMass / (7000f * bulletDiameter * bulletDiameter);
var penCoef = Mathf.Clamp01(1 - (penDistance * Mathf.Pow(sd, 0.25f)));
var criticalAngle = Mathf.Asin(ballisticMaterial.density / bulletDensity) * Mathf.Rad2Deg;
criticalAngle = criticalAngle + (criticalAngle * penCoef);
var currentAngleCoef = Mathf.Log(1 + Mathf.Pow(angle / criticalAngle, 2));
var maxAngleCoef = Mathf.Log(1 + Mathf.Pow(90f / criticalAngle, 2));
var angleCoef = currentAngleCoef / maxAngleCoef;
return(Random.Range(sd, 1f) <= 1 - angleCoef);
}
private float GetNewVelocity(BallisticMaterial bm, float penDistance)
{
var kineticEnergy = (_massKg * (_trueVelocity.magnitude *
_trueVelocity.magnitude)) / 2;
var dx = penDistance;
if (_rb.transform.position != Vector3.zero)
{
dx = Vector3.Distance(_entryHole, _exitHole);
}
var dE = ((_areaMeters * (kineticEnergy / _massKg) *
(bm.density * 1000f)) + (bm.yieldStrength / 3 * _areaMeters)) * dx;
kineticEnergy -= (dE - kineticEnergy);
return(Mathf.Sqrt((kineticEnergy) / (_massKg * 0.5f)));
}