If you have used the Marquee Tool, you know it allows you to create cuts through your model… but the limitation of the standard Tool is those cuts will be straight edged. The options for the Marquee Geometry are shown in the InfoBox below:
As you can see, there is a Polyline, a Rectangle and a Rotated Rectangle - so how did I manage to create this…
Well, I did use a Marquee, but I ‘cheated’ slightly! To create custom shapes with curves as shown above you need to draw a Polyline on plan to show the shape you want to cut in 3D. Once this is in place, all you do is Magic Wandthe Polyline with the Marquee Tool as shown below: