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isosurfaces allows to construct isolines/isosurfaces of a 2D/3D scalar field
defined by a function, i.e. curves over which f(x,y)=0 or surfaces over which
f(x,y,z)=0. Most similar libraries use marching squares or similar over a
uniform grid, but this uses a quadtree to avoid wasting time sampling many far
from the implicit surface.
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