Created by: portnov
This node calculates surface curvatures for surfaces defined by scalar field iso-surfaces - a.k.a. implicit surfaces, F(x,y,z) = C. The most clearly useful this will be in combination with "marching cubes" from sverchok-extra, but may give interesting effects by itself.
If we have a scalar field defined by V = F(x,y,z), then at each point in space (x,y,z) it has a value of V, then through each point in space goes an iso-surface defined by F(x,y,z) = V. We can calculate curvature of that surface at that point. So, it appears that given one scalar field, we can define another one, defined by K(x,y,z) = Curvature(F(x,y,z) =V at (x,y,z)). We can simply evaluate that new scalar field at any point, for example at points of the surface F(x,y,z)=V itself; or we can do other strange things with this new scalar field...
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