G-type Fillet?

 From:  Shazbot
5940.1 
Hey everybody, I recently gave Viacad a try, but it was buggy, the fillets also rendered like separate pieces, like Moi and many other programs. But fiddling with Moi lately, using the fillet tool with the G-type settings, I was able to get clean Fillets rendered, though I don't really care for their shape, it's an improvement. I have yet to try Solidworks and some others. Could someone also point out why my corners render nicely, looking like a whole part?