UNIDIR allows you to move each position of the selected
entities in a scaling direction normal to a base
plane. It has the effect of stretching or squeezing the 
geometry. The base plane is a plane that passes through a
selected base position. The base plane is either
perpendicular to a selected vector or parallel to a plane 
as defined by a selected view or a 2-D entity. The 
distance each position is moved depends on the scale 
factor.

Indicate the method of transformation by choosing from the
following options:

MOVE - to apply the transformation directly to the 
selected entities. All non-geometric data relating to 
the entities is preserved.

COPY - to apply the transformation to copies of the 
selected entities. Copies are created on the active level
and retain the attributes of the original geometry. All 
non-geometric data relating to the entities is preserved.
You can create as many copies as you want in one 
operation. The transformation for a given copy is 
applied to the results of the previous copy.

JOIN - to apply the transformation to copies of the 
selected entities and create lines from join positions on
the original entities to corresponding positions on the
copies. The new joining entities are lines that assume 
all the current default line attributes. Coincident
positions generate only one joining entity.

Joined copies are created on the active level; all 
non-geometric data relating to the entities is preserved;
you can create as many copies as you want in one 
operation; the transformation for a given copy is applied 
to the results of the previous copy.

If you are using COPY or JOIN, enter the desired number of
copies and press <Enter>.

Select the desired entities to scale, using a Selection 
Menu option.

Indicate a base position, using a Position Menu option.

Define the scaling direction by choosing from the 
following options:

2 PTS - to define the scaling direction by creating a
vector, which is defined by choosing two points. The 
entity is scaled from a base plane that runs normal to 
the defined vector. Indicate the two positions, using 
the Position Menu.

KEY-IN - to key-in the scaling direction vector. The 
entity is scaled from a base plane that runs normal to 
the defined vector and through the base position. The 
COORD: function in the Status Window indicates whether 
the coordinates are world or view. Key-in the x, y, and z 
values of the desired vector.

VIEW - to define the scaling direction as being
perpendicular to a view's display plane. The entity is
scaled vertically from a plane that runs through the base
position and parallel to the view's display plane. Key-in
the desired view number.

2D ENT - to define the scaling direction as being
perpendicular to a plane as defined by an arc, conic, or 
2-D spline. The entity is scaled from a plane that runs
through the base position and parallel to the plane 
defined by the arc, conic, or 2-D spline. Select the 
desired 2-D entity.

Enter the desired scale factor.

If using MOVE, you can choose from the following options:

CONT - to continue transforming the selected entities.

UNDO - to reverse the move and return the geometry (of the
selected entities) to what it was before the move.

