The best method (Sorted object, Sorted Triangle) accumulates all the triangles (which requires a lot of memory), then sorts them according to distance from the viewer (requires a lot of time).
The faster Blend method is used as the default.
If the default Transparency Type does not work with your plot, try the other methods by right-clicking in the Viewer window and choosing the Transparency Type menu item. For example, the Delayed Blend method makes two passes through the object list.
Updated October 10, 2016