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#ifndef __FACE_H__
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#ifndef __FACE_H__
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#define __FACE_H__
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#define __FACE_H__
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#include "templates.h"
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#include "templates.h"
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namespace HMesh
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namespace HMesh
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{
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{
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	typedef Face_template<Iters> Face;
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	typedef Face_template<Iters> Face;
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	typedef Iters::FaceList FaceList;
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	typedef Iters::FaceList FaceList;
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	typedef Iters::FaceIter FaceIter;
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	typedef Iters::FaceIter FaceIter;
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	typedef Iters::HalfEdgeIter HalfEdgeIter;
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	typedef Iters::HalfEdgeIter HalfEdgeIter;
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	/** Null Element for face lists. This is used as the value of an iterator
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	/** Null Element for face lists. This is used as the value of an iterator
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			that points to nothing. */
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			that points to nothing. */
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	extern FaceIter NULL_FACE_ITER;
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	extern FaceIter NULL_FACE_ITER;
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	/// Compute the number of edges of a face
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	/// Compute the number of edges of a face
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	int no_edges(FaceIter v);
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	int no_edges(FaceIter v);
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	/** Compute the normal of a face. If the face is not a triangle,
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	/** Compute the normal of a face. If the face is not a triangle,
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			the normal is not defined, but computed using the first three
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			the normal is not defined, but computed using the first three
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			vertices of the face. */
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			vertices of the face. */
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	CGLA::Vec3f normal(FaceIter f);
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	CGLA::Vec3f normal(FaceIter f);
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	/** Compute the area of a face. */
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	/** Compute the area of a face. */
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	float area(FaceIter f);
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	float area(FaceIter f);
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	/** Compute the centre of a face */
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	/** Compute the centre of a face */
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	CGLA::Vec3f centre(FaceIter f);
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	CGLA::Vec3f centre(FaceIter f);
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}
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}
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#endif
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#endif
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