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Top. Aligns snap and grid along 30- and 150-degree axes.
Right. Aligns snap and grid along 30- and 90-degree axes.
Choosing one of the three isometric planes causes Ortho and the crosshairs
to be aligned along the corresponding isometric axes. For example, when
Ortho is on, the points you specify align along the simulated plane you are
drawing on. Therefore, you can draw the top plane, switch to the left plane
to draw another side, and switch to the right plane to complete the drawing.
Draw Isometric Circles
Represent circles on isometric planes using ellipses.
If you are drawing on isometric planes, use an ellipse to represent a circle
viewed from an oblique angle. The easiest way to draw an ellipse with the
correct shape is to use the Isocircle option of ELLIPSE. The Isocircle option is
available only when the Style option of Snap mode is set to Isometric (see
DSETTINGS).
NOTE To represent concentric circles, draw another ellipse with the same center
rather than offsetting the original ellipse. Offsetting produces an oval-shaped spline
that does not represent foreshortened distances as you would expect.
522 | Chapter 13 Render Drawings
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