Random Cyclical Function

Replies to This Discussion

Permalink Reply by martyn hogg on December 17, 2015 at 5:01pm

Oh, I'd like to specify number of cycles within the n values too!

Permalink Reply by David Rutten on December 17, 2015 at 5:32pm

If the wavelength of the function is fixed (or are you only looking for a fixed number of periods?), what do you want randomized? The amplitude?

Permalink Reply by martyn hogg on December 17, 2015 at 5:44pm

I would like to randomise wavelength and amplitude but specify the number of periods

Permalink Reply by David Rutten on December 18, 2015 at 4:51am

And are you looking to create a curve, or do you actually want the equation that generates it as well? Because creating a wavy curve that loops around is pretty easy with periodic nurbs, but trying to make a set of sines and cosines smoothly connect is quite tricky.

Permalink Reply by David Rutten on December 18, 2015 at 5:03am

Attachments:

• periodiccurve.gh, 11 KB

Permalink Reply by martyn hogg on December 18, 2015 at 12:31pm

Thanks David,

I managed to do something close to what I wanted by randomly shifting sine waves on n curves that are drawn through the vertices of n-sided polygons arranged around a circle.

I didn't want to randomly move each point as then the resulting shape would not necessarily have a flowing form.

I'm moving each polygon vertex outwards or inwards but I want them to follow a random flowing wave rather than just be consequtively random.

The way I've done it almost gets me the effect I'm after but it would be good to have a bit more control.

Attachments:

• periodicrings.gh, 17 KB

Permalink Reply by martyn hogg on December 18, 2015 at 3:41pm

*EDIT: I randomly change the number of periods in each of the sine waves.

Permalink Reply by Kim hauer on December 18, 2015 at 7:14pm

Nice!

Question: how can all these curves or contours be connected into a single  mesh?

Permalink Reply by martyn hogg on December 19, 2015 at 9:30am

Well you could divide all the curves and use those points as mesh vertices.

I did something like this when I created a clumsy version of exoskeleton so I'll see if I can dig out the bit of VB Script.

Permalink Reply by peter fotiadis on December 20, 2015 at 3:36am

Hi Martyn,

Additionally to the defs provided insofar, get this as well:

The left part (code) is one out of many math curves makers that I did long time ago (so it's used "as-it-is" for the scope).

The right part (components) does some paranoid stuff - especially when the tan option is used.

Play with the random options as well.

Attachments:

• Curves_Sin_Cos_Tan_V1.gh, 142 KB

Permalink Reply by martyn hogg on December 20, 2015 at 9:17am

Thanks Peter,

I like how you can randomise the Y Values and the X values.

Permalink Reply by peter fotiadis on December 20, 2015 at 10:35am

BTW: Loft IS NOT CLOSED due to the other demo stuff (that are: an open curve and a  humble line).

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