3D Primitives and Conversions - Autodesk AutoCAD 2013 Practical 3D Drafting and Design - page 157

ginal objects (value 1 ) or not (value 0 ). This variable is saved with the drawing.
With value 1 , the DELOBJ variable, saved with AutoCAD, is not applied to sur-
faces and all original objects are not deleted. To delete the original objects when
creating surfaces, SURFACEASSOCIATIVITY must be 0 and DELOBJ must be 1 .
If DELOBJ is 3 (default), the original objects are not deleted.
In several situations, the 3DFACE command can be used instead of PLANESURF .
This command, fully presented in Chapter 12 , Meshes and surfaces , creates a
planar face only by specifying three or four corners. The advantages with its applic-
ation are that we can stretch any corner, even with grips, and corners can be any-
where in 3D, independent of the current UCS. For instance, we can create a vertical
face easily to simulate a door or window. These faces can be converted to surfaces
with the PLANESURF command.