public static void addProtrusion(TerrainProtrusions prot)
 {
     if (!protrusions.Contains (prot)) {
         protrusions.Add(prot);
     }
 }
 public int equals(TerrainProtrusions other)
 {
     if (center == other.center && radius == other.radius && isProtrusion == other.isProtrusion)
             return 1;
     else
             return 0;
 }