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- SECTG Menu: POLYG
- ==============================================================================
- Creates a section on a specified plane through the geometric model.
-
- 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 `p' is selected:
- 4. (POINT) point on section plane
- 5. (POINT) pick point on side to view
- if `v' is selected:
- 4. (POINT) value on axis
- 5. (POINT) value on viewing side
- if option `d' is selected:
- 2. (POINT) first point on section plane
- 3. (POINT) second point on section plane
- 4. (POINT) pick point on side to view
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-
- 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 side to view
- for all options:
- 6. (Y/N) save the section ? <y>
- if reply `y':
- 7. (CHAR) name of extracted file (1-7 char.)
-
- Description:
- This command creates a section through the geometric model along a plane:
- 1. Orthogonally at a specified coordinate value (option `o', the default).
- 2. Perpendicular to an axial plane (xy, xz, or yz option `d').
- 3. By a free plane defined by three points (option `f').
- For 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' state a coordinate
- value on the axis selected. The section plane will be perpendicular 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.
-
-
- For 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.
- For option `f':Pick three points to define a free plane and a fourth point to
- indicate the side to be kept.
- The model will be replaced on the screen by a 2D section (presented in heavy
- line type) through the specified point. The section has no thickness.
- Reply `y' to the prompt to keep the section, and give it a name. If you reply
- `n', the section will be erased and the original model will be redisplayed.
- When the section is displayed, the rest of the model is blanked. If you wish
- to see the section in the context of the whole model, you may execute the
- \nblnk command. The whole model will then appear, and the section will be
- classified as being in selection group 10 (\apsel).
-
- Example: \sectg o z v 1 0 y sect1
-
- Result: The model will be sectioned along a plane normal to the z axis
- (parallel to the xy plane) at the point where z = 1. The section plane will be
- displayed in thick lines, and will be kept in a file named $sect1.