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Off Axis - Tangents - page 1

In this lesson you will develop a projection that is off axis and on a tangent to the isometric plane. Let me stress once more that a successful illustrator is be able to picture what an off angle object looks like before they begin to draw.

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Before we can begin you must create a set of master ellipses. Create a perfect circle by choosing the ellipse tool (F7) and while holding down the constrain key (ctrl) drag across the screen to about 2 inches (Watch the status line). Convert this to a curve (Ctrl+Q) to place 4 nodes around the circle. These nodes will be at the major and minor axis’s.
Use the Transform Roll-up to apply to a duplicate the following: 
5 degree ellipse = 10% vertical scale.
10 degree ellipse = 18% vertical scale.
15 degree ellipse = 26% vertical scale.
20 degree ellipse = 34% vertical scale.
30 degree ellipse = 50% vertical scale.
Isometric ellipse (35 degree 16 minutes) = 57.4% vertical scale.
40 degree ellipse = 63% vertical scale.
45 degree ellipse = 70% vertical scale.
50 degree ellipse = 76% vertical scale.
55 degree ellipse = 79% vertical scale.
60 degree ellipse = 83% vertical scale.
65 degree ellipse = 88% vertical scale.
70 degree ellipse = 94% vertical scale.
80 degree ellipse = 97% vertical scale.
90 degree ellipse = the perfect circle.
Note: Other ellipses can be created by extrapolating the above table.

 

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1997 - 2001 John M. Morris