/// <summary>
/// Algorithm to predict the position of the target
/// </summary>
public static bool GetPredictedTargetPosition(MyGunBase gun, MyEntity shooter, MyEntity target, out Vector3 predictedPosition, out float timeToHit, float shootDelay = 0)
{
Debug.Assert(target != null && target.PositionComp != null, "Null target!");
Debug.Assert(shooter != null && shooter.PositionComp != null, "Null shooter!");
if (target == null || target.PositionComp == null || shooter == null || shooter.PositionComp == null)
{
predictedPosition = Vector3.Zero;
timeToHit = 0;
return false;
}
Vector3 targetPosition = target.PositionComp.WorldAABB.Center;
Vector3 muzzlePosition = gun.GetMuzzleWorldPosition();
Vector3 toTarget = targetPosition - muzzlePosition;
Vector3 targetVelocity = Vector3.Zero;
if (target.Physics != null)
{
targetVelocity = target.Physics.LinearVelocity;
}
Vector3 shooterVelocity = Vector3.Zero;
if (shooter.Physics != null)
{
shooterVelocity = shooter.Physics.LinearVelocity;
}
Vector3 diffVelocity = targetVelocity - shooterVelocity;
float projectileSpeed = GetProjectileSpeed(gun);
float a = diffVelocity.LengthSquared() - projectileSpeed * projectileSpeed;
float b = 2 * Vector3.Dot(diffVelocity, toTarget);
float c = toTarget.LengthSquared();
float p = -b / (2 * a);
float q = (float)Math.Sqrt((b * b) - 4 * a * c) / (2 * a);
float t1 = p - q;
float t2 = p + q;
float t;
if (t1 > t2 && t2 > 0)
{
t = t2;
}
else
{
t = t1;
}
t = t + shootDelay;
predictedPosition = targetPosition + diffVelocity * t;
Vector3 bulletPath = predictedPosition - muzzlePosition;
timeToHit = bulletPath.Length() / projectileSpeed;
return true;
}
Vector3 GetSmokePosition()
{
return(m_gunBase.GetMuzzleWorldPosition() - WorldMatrix.Forward * 0.5f);
}
/// <summary>
/// Algorithm to predict the position of the target
/// </summary>
public static bool GetPredictedTargetPosition(MyGunBase gun, MyEntity shooter, MyEntity target, out Vector3 predictedPosition, out float timeToHit, float shootDelay = 0)
{
Debug.Assert(target != null && target.PositionComp != null, "Null target!");
Debug.Assert(shooter != null && shooter.PositionComp != null, "Null shooter!");
if (target == null || target.PositionComp == null || shooter == null || shooter.PositionComp == null)
{
predictedPosition = Vector3.Zero;
timeToHit = 0;
return(false);
}
Vector3 targetPosition = target.PositionComp.WorldAABB.Center;
Vector3 muzzlePosition = gun.GetMuzzleWorldPosition();
Vector3 toTarget = targetPosition - muzzlePosition;
Vector3 targetVelocity = Vector3.Zero;
if (target.Physics != null)
{
targetVelocity = target.Physics.LinearVelocity;
}
Vector3 shooterVelocity = Vector3.Zero;
if (shooter.Physics != null)
{
shooterVelocity = shooter.Physics.LinearVelocity;
}
Vector3 diffVelocity = targetVelocity - shooterVelocity;
float projectileSpeed = GetProjectileSpeed(gun);
float a = diffVelocity.LengthSquared() - projectileSpeed * projectileSpeed;
float b = 2 * Vector3.Dot(diffVelocity, toTarget);
float c = toTarget.LengthSquared();
float p = -b / (2 * a);
float q = (float)Math.Sqrt((b * b) - 4 * a * c) / (2 * a);
float t1 = p - q;
float t2 = p + q;
float t;
if (t1 > t2 && t2 > 0)
{
t = t2;
}
else
{
t = t1;
}
t = t + shootDelay;
predictedPosition = targetPosition + diffVelocity * t;
Vector3 bulletPath = predictedPosition - muzzlePosition;
timeToHit = bulletPath.Length() / projectileSpeed;
return(true);
}