Pitch1 is the initial "instantaneous" pitch at the beginning of the helix.
This can be checked by making the tangent, and doing Angle script, with a line parallel to the x axis.
This is the Lead angle. Take its tangent on a calculator, and multiply by 2 * PI, as explained in the pdf.
Using Length=100 units, constant radius=10 units, first 360 degree turn pitch = 10 units, end 360 degree turn pitch = 30 units,
yields a variable pitch helix with N = 5 turns, Pitch1 = 7.5 units, Pitch2 = 12.5 units.
(The formula result was 7.5 units. The Lead angle was 6.8068 degrees, to 4 decimal places, 2*PI*Tan(6.8068) = 7.499808.)
Angle script could possibly have more units of precision.
The terminal "instantaneous pitch" came out to a lead angle of 27.3495 degrees, for a pitch of 32.4987 units, per my math.
- Brian
The script could have an option added to display P1 and P2
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