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		{
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		{
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			TET = 0,  // use tetrahedral decomposition
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			TET = 0,  // use tetrahedral decomposition
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			NOTET = 1  // no tetrahedral decomposition  */
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			NOTET = 1  // no tetrahedral decomposition  */
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		};
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		};
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	/** \brief Implicit function.
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	/** The implicit function class represents the implicit function we wish
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	The implicit function class represents the implicit function we wish
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			to polygonize. Derive a class from this one and implement your
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			to polygonize. Derive a class from this one and implement your
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			implicit primitive in the eval function. Eval takes x,y,z coordinates and
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			implicit primitive in the eval function. Eval takes x,y,z coordinates and
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			returns a value. We assume that the surface is the zero level set
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			returns a value. We assume that the surface is the zero level set
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			and that the negative values are outside. This an arbitrary choice
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			and that the negative values are outside. This an arbitrary choice
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			which does not make the code less general. */
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			which does not make the code less general. */
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	struct TRIANGLE
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	struct TRIANGLE
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	{
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	{
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		int v0,v1,v2;
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		int v0,v1,v2;
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	};
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	};
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	/** Polygonizer is the class used to perform polygonization.*/
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	/** \brief Polygonizer is the class used to perform polygonization.*/
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	class Polygonizer
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	class Polygonizer
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		{
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		{
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			std::vector<NORMAL> gnormals;
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			std::vector<NORMAL> gnormals;
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			std::vector<VERTEX> gvertices;
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			std::vector<VERTEX> gvertices;
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			std::vector<TRIANGLE> gtriangles;
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			std::vector<TRIANGLE> gtriangles;