Once again, not having the ability to work with the wterrain2 or sterrain opcodes has me looking at ways to play with the standard wterrain opcode. This example:
https://soundcloud.com/st-csound/cornoid

is a simple experiment using the wterrain opcode in Csound to create a cornoid. The first 10 sec are the standard ellipse produced by wterrain followed by 10 sec with a cornoid curve applied. The next three 20 sec segments are the hybrid cornoid being rotated, rotated with a curve parameter being simultaneously increased, and finally rotation with the curve parameter and radius of X&Y being increased.

For me one of the interesting aspects of this approach is the ability to still use different curves/shapes beyond the ellipse. While possibly not as readily flexible as the other opcodes it still allows for some experimentation.

Here's a page of some possible curves:
https://mathcurve.com/courbes2d.gb/courbes2d.shtml

Here:
https://www.desmos.com/calculator/tg6jwgjodp

you can see a plotted example of an "Asteroid" I took from the above link. Playing "t" will draw the curve. Raising the value of the "a" slider just increases the overall size.

And here: 
https://www.desmos.com/calculator/mikfbycmid

the Asteroid can also be rotated using slider "b".

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Hi Scott,
this is impressive work. It's fun to look at the code, see the formulas 
implmeneted and ready to play. Thanks for sharing! The sound is very hypnotic 
too. :)

Best wishes,

Jeanette

Oct 27 2022, Scott Daughtrey has written:

> Once again, not having the ability to work with the wterrain2 or sterrain opcodes has me looking at ways to play with the standard wterrain opcode. This example:
> https://soundcloud.com/st-csound/cornoid
>
> is a simple experiment using the wterrain opcode in Csound to create a cornoid. The first 10 sec are the standard ellipse produced by wterrain followed by 10 sec with a cornoid curve applied. The next three 20 sec segments are the hybrid cornoid being rotated, rotated with a curve parameter being simultaneously increased, and finally rotation with the curve parameter and radius of X&Y being increased.
>
> For me one of the interesting aspects of this approach is the ability to still use different curves/shapes beyond the ellipse. While possibly not as readily flexible as the other opcodes it still allows for some experimentation.
>
> Here's a page of some possible curves:
> https://mathcurve.com/courbes2d.gb/courbes2d.shtml
>
> Here:
> https://www.desmos.com/calculator/tg6jwgjodp
>
> you can see a plotted example of an "Asteroid" I took from the above link. Playing "t" will draw the curve. Raising the value of the "a" slider just increases the overall size.
>
> And here:
> https://www.desmos.com/calculator/mikfbycmid
>
> the Asteroid can also be rotated using slider "b".
>
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>        https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here
>

-- 
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  * Audiobombs: https://www.audiobombs.com/users/jeanette_c
  * GitHub: https://github.com/jeanette-c

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