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Re: polyline to viewport
This is the way it has always functioned. Iif you want a rectangular viewport, use mview, and draw the rectangle. When you want odd shaped viewports (i.e. circle), select the object option from mview and click on the object. When selected, in 2010, it shows the viewport properties by default, but it is still one of 2 objects, the circle cannot be separated from the viewport, if you try to delete it they both go away. The circle is the clipping boundary for the viewport. In the properties palette, you can modify both objects independently of each other by selecting the appropriate object from the pulldown at the top.
Originally Posted by mdsalman2003