The example I gave, had 3 zones and flowed from 0=>5=>50=>100.
3 to 5 zones are usually what is used with this method, good for example to simulate an exponential growth in damage.
But if you want something more regular that has like 100 zones, then better go with continous.
But like I said, if the width between the inner and outer boundaries is constant:
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and d is know then it’s easy (a simple trace and a couple of vec. ops). Otherwise, …