I am trying to draw something like this
but with a more fancy object, instead of a square, say a bunny or a human (whose silhouette's contour points I exported from an image). I know I need to make my question as general as possible to benefit other users. So here is my question:
How could I make the silhouette cone, say red cone, tracing around the shape of the object, rather than in this case where they look quite flat. Some thing looks like this
where the silhouette cones contains the objects and looks 3D.