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/* ----------------------------------------------------------------------- *
 * This file is part of GEL, http://www.imm.dtu.dk/GEL
 * Copyright (C) the authors and DTU Informatics
 * For license and list of authors, see ../../doc/intro.pdf
 * ----------------------------------------------------------------------- */

/**
 * @file caps_and_needles.h
 * @brief Simple tools for improving polygonal meshes by removing bad triangles.
 */

#ifndef __HMESH_CAPS_AND_NEEDLES_H__
#define __HMESH_CAPS_AND_NEEDLES_H__

namespace HMesh
{
    class Manifold;
    /** \brief Remove caps from a manifold consisting of only triangles.
    A cap is a triangle with two very small angles and an angle close to pi, however a cap does not necessarily have a very short edge.
    Set the ang_thresh to a value close to pi. The closer to pi the _less_ sensitive the cap removal.
    A cap is removed by flipping the (long) edge E opposite to the vertex V with the angle close to pi. 
    However, the function is more complex. Read code and document more carefully !!! */
    void remove_caps(Manifold& m, float thresh);

    /** \brief Remove needles from a manifold consisting of only triangles.
    A needle is a triangle with a single very short edge. It is moved by collapsing the short edge. 
    The thresh parameter sets the length threshold.             
    The position of the vertex which survives the collapse is set to one of the two end points. 
    Selection is based on what changes the geometry least. */
    void remove_needles(Manifold& m, float thresh);
}

#endif