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csgeom/pmtools.h

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00001 /*
00002     Copyright (C) 2002 by Jorrit Tyberghein
00003 
00004     This library is free software; you can redistribute it and/or
00005     modify it under the terms of the GNU Library General Public
00006     License as published by the Free Software Foundation; either
00007     version 2 of the License, or (at your option) any later version.
00008 
00009     This library is distributed in the hope that it will be useful,
00010     but WITHOUT ANY WARRANTY; without even the implied warranty of
00011     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012     Library General Public License for more details.
00013 
00014     You should have received a copy of the GNU Library General Public
00015     License along with this library; if not, write to the Free
00016     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00017 */
00018 
00019 #ifndef __CS_PMTOOLS_H__
00020 #define __CS_PMTOOLS_H__
00021 
00028 class csVector3;
00029 class csPlane3;
00030 struct iPolygonMesh;
00031 
00032 #include "csextern.h"
00033 
00034 #include "csutil/array.h"
00035 #include "csgeom/polymesh.h"
00036 
00040 struct csPolygonMeshEdge
00041 {
00042   // Indices of the two vertices forming the edge.
00043   // vt1 < vt2.
00044   int vt1, vt2;
00045   // Indices of the two polygons sharing this edge.
00046   // If poly2 == -1 then this is an edge with only one polygon attached.
00047   int poly1, poly2;
00048 
00049   // Active or not. If this flag is true the edge is active in the sense
00050   // that it actually connects two non-coplanar polygons (or is only
00051   // connected to one polygon). Edges that are not active are not relevant
00052   // for outline calculation.
00053   bool active;
00054 };
00055 
00059 class CS_CSGEOM_EXPORT csPolygonMeshTools
00060 {
00061 public:
00067   static void CalculateNormals (iPolygonMesh* mesh, csVector3* normals);
00068 
00074   static void CalculatePlanes (iPolygonMesh* mesh, csPlane3* planes);
00075 
00083   static csPolygonMeshEdge* CalculateEdges (iPolygonMesh*, int& num_edges);
00084 
00090   static int CheckActiveEdges (csPolygonMeshEdge* edges, int num_edges,
00091         csPlane3* planes);
00092 
00114   static void CalculateOutline (csPolygonMeshEdge* edges, int num_edges,
00115         csPlane3* planes, int num_vertices,
00116         const csVector3& pos,
00117         int* outline_edges, int& num_outline_edges,
00118         bool* outline_verts,
00119         float& valid_radius);
00120 
00125   static bool IsMeshClosed (iPolygonMesh* polyMesh);
00126 
00133   static void CloseMesh (iPolygonMesh* polyMesh, 
00134     csArray<csMeshedPolygon>& newPolys, int*& vertidx, int& vertidx_len);
00135 
00140   static void Triangulate (iPolygonMesh* polymesh,
00141         csTriangle*& tris, int& tri_count);
00142 
00148   static void Polygonize (iPolygonMesh* polymesh,
00149         csMeshedPolygon*& polygons, int& poly_count);
00150 };
00151 
00154 #endif // __CS_PMTOOLS_H__
00155 

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