Sets the WCS normal to the plane of the planar solid entity (DXF 210). The normal defines the orientation of the solid plane in world space. The initial value is (0,0,1) by default. 

This method automatically converts the specified vector to the unit vector.

Example of Working with the Planar Solid Object 

Specific Planar Solid Properties 

OdDbSolid::normal() method

OdDbSolid Methods