protected void DoCreateProjectile(Transform origin)
{
// Because the weapon fire point and the aiming point wasn't same,
// We need to correct its trajectory.
Transform weaponFireTransform = weaponEffectPoint.transform;
Vector3 correctionVector = weaponFireTransform.InverseTransformVector(origin.position - weaponEffectPoint.position);
correctionVector.z = 0;
GameObject obj = Instantiate(projectilePrefab, weaponEffectPoint.position, origin.rotation);
BaseProjectile proj = obj.GetComponent <BaseProjectile>();
proj.InitData(this, weaponFireTransform.rotation, correctionVector);
}