SECTE                                                              Menu: PEDIT
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Sections a solid entity on a plane.

        1. (CHAR) option: plane: (o-orthogonal, d-diagonal, f-free) <o>
     if option `o' is selected:
        2. (CHAR) axis of section (x,y or z)
        3. (CHAR) define the section by: v-value, p-point <p>
     if option `p' is selected:
        4. (POINT) point on section plane
        5. (POINT) pick point on part to be kept
     if option `v' is selected:
        4. (POINT) value on axis
        5. (POINT) specify location within part to be kept
     if option `d' is selected:
        2. (POINT) first point on section plane
        3. (POINT) second point on section plane
        4. (POINT) pick point on part to be kept
     if option `f' is selected:
        2.   (POINT) first point on section plane
        3.   (POINT) second point on section plane
        4.   (POINT) third point on section plane
        5.   (POINT) pick point on part to be kept
     for all options:
        6. * (IND) entity to section
        7. * (Y/N) confirm choice
        8. * (Y/N) keep the result ? <y>
Description:
This command sections a 3D entity along a plane either:
1. orthogonally at a specified coordinate value (`o', the default), or
2. perpendicular to an axial plane, or
3. by a free plane defined by three points.
Orthogonal (option `o'):
Specify an axis and select one of two further options: `p', the default, to
point to the position of the section, or `v', to state a coordinate value on
the axis selected. The section plane will be normal to the axis at the
specified value. Then enter another coordinate value on the same axis to
indicate which side of the section plane is to be kept.


Diagonal (option `d'):
Pick two points on one of the axial planes (xy, yz or xz). The section will be
cut through the two points perpendicular to the plane on which the points are
located. Pick another point to indicate the side of the section that is to be
retained.
Free (option `f'):
Pick three points to define a free plane and a fourth point to indicate the
side to be kept. Indicate (and confirm) the entity you wish to section. The
sectioned entity will be displayed temporarily. You are then prompted to keep
or reject the result. If you enter `y' the temporary entity becomes
a permanent new entity consisting only of the side you selected to be kept.
You are prompted to indicate additional entities to be sectioned until you
enter a new command.
The result of this process is a complex solid entity (data type 9).
A wall sectioned by this command becomes a complex wall and continue to
possess the characteristics of a wall but the commands \chaw, \chaa, \fixw,
and \fixa have no effect. This command sections only walls and solids. You may
not cut lines, arcs, texts, or dimension lines.
When indicating an entity to cut:
1. An axial wall entity must be indicated by pointing to its axial line or to
   its solid.

2. A solid prism or any solid created by two polygons must be indicated by
   pointing to one of the edges connecting the polygons.
3. The number of points in any polygon (including the resultant polygon) must
   not exceed 200. Take care when sectioning a wall through its openings since
   the result will be a single complex entity.
4. If a placed entity containing several cut entities is operated on, the
   result will be a single complex entity.
5. The axial entity of an axial wall will not be saved.

        Example: \secte o z v 1 0 (indicate) y y

Result: The indicated entity is sectioned along a plane normal to the z axis
(parallel to the xy plane) at the point where z=1. The part having a z value
larger than1 disappears, leaving only the part where z is less than1.
