CONSTRUCT SHAPE PLANE [shape_name] Plane_definition [refcs][csname]

shape_name	=	Name of the plane (optional).
refcs	=	Reference axis type for the orientation of the plane, either
		`GLOBAL' or `LOCAL'. This will override the currently active
		system. If `LOCAL' is specified then the name of an existing
		local coordinate system must be given. (Although just the name
		of the existing local system can be given. FEMGEN only)
csname	=	Name of an existing local coordinate system as defined using
		CONSTRUCT COORDSYS. (FEMGEN only)

Definition of plane	Comments
pnam1 pnam2 pnam3	The names of 3 points defining the plane (FEMGEN
	only).
NODES n1,n2,n3	3 nodes defining the plane (FEMVIEW only).
MODEL x1,y1,z1, x2 ... z3	Co-ordinates in model space of 3 points on the plane
	(FEMVIEW only).
X [offset]	Defines a plane parallel to the global YZ plane with an
	optional offset from the model origin. In FEMGEN
	csname may also be specified, in which case a plane
	parallel to the local YZ plane, offset along the local
	X axis is created. In FEMGEN if a local coordinate
	system is active when the plane is defined, the plane
	will be created relative to the local system unless the
	GLOBAL keyword is used
Y [offset]	Defines a plane parallel to the global ZX plane with an
	optional offset from the model origin. In FEMGEN
	csname name may also be specified, in which case a plane
	parallel to the local ZX plane, offset along the local
	Y axis is created. In FEMGEN if a local coordinate
	system is active when the plane is defined, the plane
	will be created relative to the local system unless the
	GLOBAL keyword is used

Definition of plane	Comments
Z [offset]	Defines a plane parallel to the global XY plane with an
	optional offset from the model origin. In FEMGEN
	a local coordinate system name may also be specified,
	in which case a plane parallel to the local XY plane,
	offset along the local Z axis is created. In FEMGEN
	if a local coordinate system is active when the plane is
	defined, the plane will be created relative to the local
	system unless the GLOBAL keyword is used
NORMAL x,y,z [offset]	Defines the normal to the plane with an optional offset
	from the model origin in the direction of the normal.
	In FEMGEN a local coordinate system may also be
	specified in which case the offset and normal vector
	are relative to the local system. Similarly if a local
	coordinate system is active when this command is used
	the plane is created in this system.
/CURSOR	Two cursor selections are made to define a plane
	that lies perpendicar to the plane of the screen.

The plane can be used subsequently in FEMGEN to define intersection points, lines and surfaces, for the projection of surfaces, for projections during cursor or digitiser input of points or in FEMVIEW for defining cross-sections or cut-aways.

When a label for the plane is displayed in FEMGEN the positive normal for the plane is also displayed as a vector.