Using ACAD14 I am unsuccessful at drawing a 3-point arc in three dimensions. I've since found another procedure to get the arc almost the way that I want it but if I could specify 3 points in 3-space and have the program generate the required arc then it would be more accurate and a lot less trouble. I guess a better way to describe the problem would be to say that drawing sections of helixes is extremely difficult and I don't know what I am doing wrong.
Grapes of Wrath
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