Im not talking about create a window with a irregular form, view from front, otherwise, i’m talking about a curved window, view from top. Must I do an instance block or design my own window-profile with the characteristics that I wish. Or simply it is not possible?
Windows can’t get curved shapes, unless you use the option to create a window style from a block.
On the other hand, curtain walls can have curved panels, so perhaps you can use them instead. http://www.visualarq.com/support/tips/11769/