Fillet issue on corners.

 From:  Toha785 (TOHA)
9959.1 
Hey everyone! i am new in nurbs modelling. i wonder to know why i can not fillet all edges with corners. I have tried to find an issue but there is no any answers. I will be glad if you will help me. Thanks
Attachments:

Image Attachments:
Size: 93.7 KB, Downloaded: 14 times, Dimensions: 1087x1169px