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- GENERAL allows you to choose a set of entities (excluding
- points) whose projections define a closed region in the
- current view.
-
- Choose a Selection Menu option to specify a set of
- entities. As with crosshatching, islands can be chosen
- that will be excluded (or included) as required.
-
- If the selected entities do not form a closed shape, they
- are rejected and you are prompted to press <Enter> to
- continue. Choose from the Selection Menu once again and
- reselect the desired entities.
-
- Enter a panel width value and press <Enter>. To assign the
- default width value in parentheses, press <Enter>. These
- rectangular shapes (referred to as panels) approximate the
- area used in calculating the moment of the selected shape.
-
- A smaller width value generates more panels within the
- shape, therefore adding more accuracy to the moment value.
- Locate the polar reference axis. The polar reference axis
- is defined as a vector pointing out of the screen and
- passing through the projection of the selected point to
- the current view.
-
- The panels are created within the selected shape, and the
- polar moment of inertia is calculated and displayed.
-
- Press <Enter> to successively display the two components of
- the polar moment with respect to orthogonal axes through
- the polar position. Choose the BACK-UP option to redisplay
- the previous value.
-
- Press <Enter> after the last component displayed to choose
- a new reference axis.
-
- To clear temporary markers and panels from the screen,
- redraw screen.
-