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Double-Exponential Sigmoid shape with VOP SOP


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I'm really a novice using Houdini. Since the begining the learning has been mind blowing. I love the procedural way more than ever! Nevertheless, from time to time I stumble with stuff like this:


How to draw a Double-Exponential Sigmoid curve like this http://www.flong.com/texts/code/shapers_exp/


I tried VOP SOP with other funtions, like the egg equation thanks to eetu's lab, which is inspiring; but this one seems to be elusive. Any advice will be much appreciated.


Thanks to this forums I'm learning a lot, and I'm sure I'll continue to do so.


Thanks again,


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