| isValid | 
        Indicates if this object is still valid, i.e. hasn't been deleted or some other action done to invalidate the reference. | 
      
      
        | objectType | 
        This property is supported by all objects in the API and returns a string that contains the full name (namespace::objecttype) describing the type of the object.
   It's often useful to use this in combination with the classType method to see if an object is a certain type. For example: if obj.objectType == adsk.core.Point3D.classType(): | 
      
      
        | parentConstructionPlane | 
        Returns the ConstructionPlane object | 
      
      
        | pointEntityOne | 
        Gets the first construction point, sketch point or vertex. | 
      
      
        | pointEntityThree | 
        Gets the third construction point, sketch point or vertex. | 
      
      
        | pointEntityTwo | 
        Gets the second construction point, sketch point or vertex. |