//get material by providing a name
public static PortalMaterial GetMaterialByName(string givenName)
{
return(AllMaterials.Where(pm => pm.Name == givenName).FirstOrDefault());
}
//select a random material of the given color
public static PortalMaterial RandomMaterialWithColor(MaterialColor color)
{
return(RandomElement(AllMaterials.Where(pm => pm.Color == color || pm.Color == MaterialColor.Meta)));
}