Drawing Arc Segments

If the Opening Section boundary includes a circular arc segment (e.g. a curved roof), or is a full circle (e.g. a circular tunnel or shaft), then you can easily create an arc segment or circle while you are using the Add Opening Section option, as follows:

Drawing an Arc

Number of segments in arc <20>:

Press Enter to accept the default value of 20 or type in a new number.

Drawing a Circle

Note that arcs and circles are actually made up of straight-line segments. It is suggested that the user experiment with this option to see how it works.