Devin Knight looks at the Aster Plot in his latest Power BI visualization video:
The Aster Plot allows a category that dives the chart and up to 2 measures.
The first measure controls the depth of each section
The second measure controls the width of each section
I have to admit that I’m not a fan of the Aster Plot. It has all the disadvantages of pie and torus charts (specifically, that humans have a hard time discerning differences in angles) while making it more complex and comparing across a second dimension as well.