private void GenerateSymbol(int id, Vector3 position)
{
// Instantiate the symbol at the origin using the prefab
Transform newSymbolTF = Instantiate(prefab_symbol, position, Quaternion.LookRotation(Vector3.back)) as Transform;
// Set the symbol to be a child of this empty object and then set the local position
newSymbolTF.parent = transform;
newSymbolTF.localPosition = position;
// Set the material according to the symbol ID
Material newSymbolMat = newSymbolTF.gameObject.GetComponent <Renderer> ().material;
newSymbolMat.SetColor("_EmissionColor", Color.black);
// Set the texture for the material to the correct symbol (from Assets/Resources/Totem#/#.png)
string fileName = "Totem" + parent_totem.GetTotemNum() + "/" + id;
Texture texture = Resources.Load(fileName) as Texture;
newSymbolMat.mainTexture = texture;
newSymbolMat.SetTexture("_EmissionMap", texture);
// Set the symbol's id and update the symbols list
Symbol newSymbol = newSymbolTF.gameObject.GetComponent <Symbol> ();
newSymbol.Init(gparent_gridSpace, parent_totem, id, rows, index, tileHeight);
symbolList [id] = newSymbol;
symbolCount++;
}