def build(px, py, structure, default_color):

        pz = int(hmap.get(px,py)*63)

        for xyz, color in structure.iteritems():
            x, y, z = xyz
            x, y, z = x + px, y + py, z + pz
            vxl.set_point(x, y, z, color or default_color) #if color is none, use default_color