Picture to People 3D libraries are already able to make a correct mapping of some kinds of 3D objects that can not be represented by a implicit or explicit equation (usually equations make calculations and representations simpler).The more important is the normal vectors directions are calculated correctly. Sometimes a big problem with 3D models is that it's hard to know when you are inside or outside a complex object.
Above you can see a 3D object drew with its normals.
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