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namespace Geometry
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namespace Geometry
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{
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{
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	const CGLA::Vec3i NULL_FACE(-1,-1,-1);
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	const CGLA::Vec3i NULL_FACE(-1,-1,-1);
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	/** This class represents the simplest possible triangle mesh data structure.
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	/** \brief This class represents the simplest possible triangle mesh data
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			structure.
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			Faces must be triangular, and 3D coordinates are the only values
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			Faces must be triangular, and 3D coordinates are the only values
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			associated with the vertices. */
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			associated with the vertices. */
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	class IndexedFaceSet
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	class IndexedFaceSet
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	{
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	{
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		/// Vertices
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		/// Vertices
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		// ----------------------------------------
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		// ----------------------------------------
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		// Functions that operate on faces
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		// Functions that operate on faces
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		// ----------------------------------------
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		// ----------------------------------------
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		/** Add a face and return the index of the new face. If the optional
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		/** Add a face and return the index of the new face.
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				idx argument is present, the face array is resized so that the
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		If the optional idx argument is present, the face array is resized so
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				new index == idx. */
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		that the new index == idx. */
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		int add_face(const CGLA::Vec3i& f, int idx=-1)
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		int add_face(const CGLA::Vec3i& f, int idx=-1)
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		{
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		{
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			if(idx < 0)
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			if(idx < 0)
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				idx = faces.size();
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				idx = faces.size();
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			faces.resize(idx+1,NULL_FACE);
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			faces.resize(idx+1,NULL_FACE);
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		}
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		}
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		/// Return the number of faces.
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		/// Return the number of faces.
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		int no_faces() const {return faces.size();}
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		int no_faces() const {return faces.size();}
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		/** Return the face corresponding to a given index. The NULL_FACE
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		/** Return the face corresponding to a given index.
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				is returned if the index is out of bounds. */
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				The NULL_FACE	is returned if the index is out of bounds. */
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		const CGLA::Vec3i& face(int idx) const
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		const CGLA::Vec3i& face(int idx) const
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		{
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		{
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			if(idx<faces.size())
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			if(idx<faces.size())
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				return faces[idx];
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				return faces[idx];
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			return NULL_FACE;
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			return NULL_FACE;
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		}
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		}
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		/// Return the number of vertices.
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		/// Return the number of vertices.
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		int no_vertices() const {return verts.size();}
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		int no_vertices() const {return verts.size();}
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		/** Return the vertex corresponding to a given index. User is responsible
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		/** Return the vertex corresponding to a given index.
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				for bounds checking. */
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		User is responsible	for bounds checking. */
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		const CGLA::Vec3f& vertex(int idx) const
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		const CGLA::Vec3f& vertex(int idx) const
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		{
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		{
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			return verts[idx];
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			return verts[idx];
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		}
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		}
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