That’s a good starting point!
And then even scatter(pts) works. The 'and reduce have to read carefully again, but I now see where my error was: I though with DataType the documentation referred to single data items, but actually a @reciepe transforms the input (so here the vector of data points) into something it can continue with.
Now I just have to find out why my plots then end up being 2D instead of 3D; but you already helped me a lot 