hi, there is a vertex folder within gem src (hans pointed me to it), and it compiles, but I am not sure if the objects are working? I can create them, but handling and syntax seems not quite clear to me. is this in development? I tried [gemhead] | [vertex_grid] | [vertex_draw] which gave me a white square in the right top corner and [gemhead] | [vertex_model] | [vertex_draw] which did not draw anything. marius.