Hi Ambimind, re: Sine - there is a plug-in you can get here for creating a sine wave curve, it may be useful:

http://moi3d.com/forum/display.php?webtag=MOI&msg=1519.38

- Michael

Hi Ambimind.

In the first step, how did you get the curve?
(Is your "sine" really a sine, or a parabola?)

(Michaels sine script works well, even for cosines...)

Hi Michael.
I noticed that the sinewave script uses the curve factory, and that the amplitude
shows up as a little shy of the selected amplitude. Gets better with higher number of points.

Tried script with change to interpcurve factory. The amplitude is closer to the selected amplitude, but zooming
way way in still shows a little off. (but within some tolerance?)

Not a big deal, unless someone is trying for a certain amplitude...?

Hi Brian, yeah the sine wave script just plots a lot of points for the control polygon hull and with more points the curve will approach the hull but not quite go exactly through it. It will be quite close though.

Using an interpolated curve will make the curve go exactly through the sampled points, I guess the script could be modified to make sure that there was a point being generated at the 90 and 270 degree spots.

But doing an interpolated curve is not necessarily automatically better - it kind of applies more force to the curve and can introduce a tiny bit of wiggling to the curve's shape. Using the control polygon hull will instead be super smooth with absolutely no wiggling of any kind.

- Michael

Thank you for the clarification.

bemfarmer, I used a "through points" curve. Its probably not exactly a plot of the sine() function. I used it because it easier to place and achieve an even curvature(what what I had in mind when I said "accurate").

Michael: The way you repaired the problem(join then delete the point) is completely new to me. Until now I have been rebuilding curves or scaling points so they are co-linear <- how dopy!!
Its interesting how habits and assumptions from other software persist.

Thx as always,
Ambimind