Hi Mike,

> Was this done with the 'star' patch routine or was it some special analytical case just for fillets?

It's a general star-patch hole filling routine that is calculating that in MoI.

And yeah it's not exactly horrible but if you generate a heavier tessellation of the model you'll see a kind of star pattern of ridges radiating out from the center point. Often times the ridges can be fairly pronounced especially when the boundary is not quite so uniformly shaped as in these fillet cases.

- Michael