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/**
* $Id$
* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version. The Blender
* Foundation also sells licenses for use in proprietary software under
* the Blender License. See http://www.blender.org/BL/ for information
* about this.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL/BL DUAL LICENSE BLOCK *****
*/
#ifndef NAN_INCLUDED_BSP_MeshFragment_h
#define NAN_INCLUDED_BSP_MeshFragment_h
#define BSP_SPLIT_EPSILON MT_Scalar(1e-5)
#include <vector>
#include "BSP_MeshPrimitives.h"
class BSP_CSGMesh;
class MT_Plane3;
/**
* This class encodes a collection of polygons from a mesh.
* This class only remains valid when mesh indices do not change
* internally and of course whilst the mesh is still around.
*
* Polygons in the mesh point back to the unique mesh fragment
* containing them.
*/
class BSP_MeshFragment {
public:
BSP_MeshFragment(
BSP_CSGMesh *mesh,
BSP_Classification classification
);
std::vector<BSP_FaceInd> &
FaceSet(
) ;
const
std::vector<BSP_FaceInd> &
FaceSet(
) const ;
BSP_CSGMesh *
Mesh(
);
BSP_CSGMesh *
Mesh(
) const;
// Classify this mesh fragment with respect
// to plane. The index sets of this fragment
// are consumed by this action. Vertices
// are tagged with a classification enum.
void
Classify(
const MT_Plane3 & plane,
BSP_MeshFragment * in_frag,
BSP_MeshFragment * out_frag,
BSP_MeshFragment * on_frag,
std::vector<BSP_FaceInd> & spanning_faces,
std::vector<BSP_VertexInd> & visited_verts
);
// Classify all the vertices and faces of mesh, generate
// in,out and on mesh fragments.
static
void
Classify(
BSP_CSGMesh & mesh,
const MT_Plane3 & plane,
BSP_MeshFragment * in_frag,
BSP_MeshFragment * out_frag,
BSP_MeshFragment * on_frag,
std::vector<BSP_FaceInd> & spanning_faces,
std::vector<BSP_VertexInd> & visited_verts
);
// Classify the on fragment into
// 2 sets, the +ve on frags those whose polygon
// normals point in the same direction as the plane,
// and the -ve frag whose normals point in the other direction.
void
ClassifyOnFragments(
const MT_Plane3 &plane,
BSP_MeshFragment *pos_frag,
BSP_MeshFragment *neg_frag
);
~BSP_MeshFragment(
);
/**
* Sanity checkers.
*/
private:
// Classify the polygon wrt to the plane
static
BSP_Classification
ClassifyPolygon(
const MT_Plane3 &plane,
const BSP_MFace & face,
std::vector<BSP_MVertex>::const_iterator verts,
std::vector<BSP_VertexInd> & visited_verts
);
private :
BSP_CSGMesh * m_mesh;
BSP_Classification m_classification;
std::vector<BSP_FaceInd> m_faces;
};
#endif
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