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the unknown spiral
Uploaded as a request. Looking for parametric curve definition to produce this kind of imagery, as it is now an approximation. The idea is the following: in technical drawings for example, giving an object a particular tone is achieved by hatching. Hatching may consist of parallel lines, drawn with the same line weights. But how could someone make an angled hatch in a polar way -meaning anything but concentric circles-? Still keeping a consistent tone at the end. Any ideas? Archimedean spirals are a close match if the width of the stroke is 0, but not this case
spirale approssimazione cova

The unknown spiral

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