Subject: Drawing a section line

A section line can be drawn in any three-dimensional drawing to determine a two-dimensional projection of the area you want to view. The section line is a polyline that can consist of continuous segments that define the area you want to view.

After you draw a section line in your drawing, you can modify its segments and length, then update the two-dimensional projection view.

To draw a selection line

   1   Do one of the following to choose Section Line ():

•   On the ribbon, choose Draw > Section Line (in AEC Entities).

•   On the menu, choose Draw > AEC Entities > Section Line.

•   Type sectionline and then press Enter.

   2   Specify the start point of the section line.

   3   Specify the end point of each segment.

   4   Specify the end point of the section line, then press Enter.

   5   To turn on the visibility of hidden lines, choose No. To keep hidden lines invisi­ble, choose Yes.

   6   Specify the insertion point of the 2D projection.

To add a new 2D projection from an existing section line

   1   Type sectionlinegenerate and then press Enter.

   2   Select the section line, then press Enter.

   3   Specify an insertion point for the new 2D projection view.

Use a shortcut.
Right-click the section line you want to generate a new projection for, then choose Generate 2D Section.

To modify the position of an existing section line

   1   Select the section line.

   2   Move its start point, segments, end point, or length.

If Use Model Extents for Height is set to Yes in the Properties pane, the section line height and lower extension are matched automatically. If set to No, you can change the height and lower extension separately.

   3   If automatic updating is turned off, right-click the 2D projection, then choose Refresh.

To modify the properties of a section line symbol

   1   Select the symbol of a section line.

   2   In the Properties pane, select new properties, including the label text. Note that the symbol is annotative and can be scaled.

Use the AECAUTOUPDATE system variable to control automatic updating.
If AECAUTOUPDATE is set to 1, two-dimensional projection views update automat­ically after a section line or elevation line changes. If set to 0, you need to manually refresh projection views after changes.