Use this component to perform the analysis of gravitational water flow.
It can be a useful indicator of drainage analysis of a building, terrain, landscape or any other sort of geometry.
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Component based on:
"Finding the downhill direction vector when given a plane defined by a normal and a point", stackoverflow.com topic by Zach Helms, 2016
http://stackoverflow.com/q/14369233/3137724
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Provided by Gismo 0.0.3