Creating planar surfaces  

You can create planar surfaces by drawing a rectangle or selecting existing closed, planar entities such as polylines, polygons, circles, ellipses, closed splines, and donuts. You can also select open entities such as lines and arcs, if they have common endpoints and they form a closed area.

To create a rectangular planar surface

   1   Do one of the following to choose Planar Surface ():

    On the ribbon, choose Draw 3D > Planar Surface (in Surfaces).

    On the menu, choose Draw > Surfaces > Planar Surface.

    On the Draw 3D Surfaces toolbar, click the Planar Surface tool.

    Type planesurf and then press Enter.

   2   Specify a point for the first corner.

   3   Specify a point for the opposite corner.

To create a planar surface from existing entities

   1   Do one of the following to choose Planar Surface ():

    On the ribbon, choose Draw 3D > Planar Surface (in Surfaces).

    On the menu, choose Draw > Surfaces > Planar Surface.

    On the Draw 3D Surfaces toolbar, click the Planar Surface tool.

    Type planesurf and then press Enter.

   2   Choose Entity.

   3   Select closed, planar entities, then press Enter.