William F Pokorny <ano### [at] anonymousorg> wrote:

> unable to understand the whole of what is happening on the path from
> code & pattern to result.
> Bill P.


IMHO, it's understandable seeing at the center.
In short, rotation + warp repeat y flip y acts as a kaleidoscope, as long as you
rotate 180 degrees (ncount_max * fA) or a multiple of it.

To show, what I mean, I add an image with code spippets included.
Distance from origin is needed to get rid of the kaleidoscope effect...

Norbert

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