void shootBullet()
{
GameObject bullet = Instantiate(bulletPrefab, transform.position + bulletStartPosition, Quaternion.identity);
// set color
// set physical layer
bullet.GetComponent <Renderer>().material.color = ColorLayerInfo.GetColorByLayerName(color);
bullet.layer = LayerMask.NameToLayer(color);
Rigidbody2D rb;
rb = bullet.GetComponent <Rigidbody2D>() as Rigidbody2D;
rb.velocity = bulletInitialVelocity;
bullet.GetComponent <Bullet>().lifeTime = bulletLifeTime;
}
void updateLayerAndColor(string layerName)
{
gameObject.layer = LayerMask.NameToLayer(layerName);
gameObject.GetComponent <Renderer>().material.color = ColorLayerInfo.GetColorByLayerName(layerName);
}