[deadalvs]

hi !

i am searching the mathematical function based on the standard sine, which changes the form from the normal swinging curve to this profile, oscillating between 1 and -1 but with harder curves and straight parts.
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http://www.rheinzink.ch/zoom_1019.aspx

i know i've seen that before, but i cannot find the answer ..

any input welcome !

[rmw]

Like a square wave made from sin waves?

Use a sine wave with the same properties as the square wave (frquency,amplitude) as the base and then add harmonics of the base wave with decreasing amplitudes.


From http://en.wikipedia.org/wiki/Square_wave

[deadalvs]

thanks for that link.

i got an other input that also uses this approach, the problem that remains is that the negative areas always have the same length as the positive areas. i need some sort of smaller beveled gap so it looks like constructed.

i helped myself by modeling those profiles with a curve, but the mathematic approach would still be interesting !

with two harmonics the result can look pretty convincing.