bool CalculateBullet(D3DXVECTOR3 &vLocalOrigin, D3DXVECTOR3 &vAimSpot, D3DXVECTOR3 &vTargetVelocity, D3DXVECTOR3 &vLocalVelocity, FLOAT fBulletSpeed)
{


	D3DXVECTOR3 vDistVec = vLocalOrigin - vAimSpot;
	//D3DXVECTOR3 vDistVec = D3DXVECTOR3(distmp.X, distmp.Y, distmp.Z);
	float flTDistance = D3DXVec3Length(&vDistVec);

	FLOAT flGravityConstant = 9.81f;

	FLOAT flTTI = flTDistance / fBulletSpeed;

	float flDropAdjust = 0.5 * flGravityConstant * flTTI * flTTI;

	vAimSpot = vAimSpot + vTargetVelocity * flTTI;
	// vAimSpot = vAimSpot - vLocalVelocity * flTTI;
	vAimSpot.y += flDropAdjust;
	return TRUE;
}