added some comments
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@ -24,6 +24,9 @@
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History
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$Log: not supported by cvs2svn $
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Revision 1.9 2005/12/02 00:27:22 cignoni
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removed excess typenames
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Revision 1.8 2005/10/03 16:21:10 spinelli
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erase wrong assert on boxToIbox function
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@ -59,19 +62,24 @@ Removed BestDim function from the grid_static_ptr class and moved to a indipende
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namespace vcg {
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// Basic Class abstracting a gridded structure in a 3d space;
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// Usueful for having coherent float to integer conversion in a unique place:
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// Some Notes:
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// - bbox is the real occupation of the box in the space;
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// - siz is the number of cells for each side
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// Note that PToIP(bbox.max) returns an invalid cell index (e.g. it returns siz)
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/** BasicGrid
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Basic Class abstracting a gridded structure in a 3d space;
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Usueful for having coherent float to integer conversion in a unique place:
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Some Notes:
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- bbox is the real occupation of the box in the space;
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- siz is the number of cells for each side
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OBJTYPE: Type of the indexed objects.
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SCALARTYPE: Scalars type for structure's internal data (may differ from
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object's scalar type).
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template <class OBJTYPE, class SCALARTYPE>
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class BasicGrid:public SpatialIndex<OBJTYPE,SCALARTYPE> {
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*/
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public:
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template <class OBJTYPE, class SCALARTYPE>
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class BasicGrid:public SpatialIndex<OBJTYPE,SCALARTYPE>
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{
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public:
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typedef SCALARTYPE ScalarType;
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typedef Box3<ScalarType> Box3x;
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@ -81,58 +89,68 @@ namespace vcg {
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typedef BasicGrid<OBJTYPE,SCALARTYPE> GridType;
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Box3x bbox;
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/// Dimensione spaziale (lunghezza lati) del bbox
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Point3<ScalarType> dim;
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/// Dimensioni griglia in celle
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Point3i siz;
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/// Dimensioni di una cella
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Point3<ScalarType> voxel;
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CoordType dim; /// Spatial Dimention (edge legth) of the bounding box
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Point3i siz; /// Number of cells forming the grid
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CoordType voxel; /// Dimensions of a single cell
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// Dato un punto ritorna le coordinate della cella
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/* Given a 3D point, returns the coordinates of the cell where the point is
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* @param p is a 3D point
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* @return integer coordinates of the cell
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*/
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inline Point3i GridP( const Point3<ScalarType> & p ) const
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{
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Point3i pi;
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PToIP(p,pi);
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PToIP(p, pi);
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return pi;
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}
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/// Dato un punto 3d ritorna l'indice del box corrispondente
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inline void PToIP(const Point3<ScalarType> & p, Point3i &pi ) const
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/* Given a 3D point p, returns the index of the corresponding cell
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* @param p is a 3D point in the space
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* @return integer coordinates pi of the cell
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*/
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inline void PToIP(const CoordType & p, Point3i &pi ) const
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{
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Point3<ScalarType> t = p - bbox.min;
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pi[0] = int( t[0]/voxel[0] );
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pi[1] = int( t[1]/voxel[1] );
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pi[2] = int( t[2]/voxel[2] );
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CoordType t = p - bbox.min;
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pi[0] = int( t[0] / voxel[0] );
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pi[1] = int( t[1] / voxel[1] );
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pi[2] = int( t[2] / voxel[2] );
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}
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/// Given a voxel index return the lower corner of the voxel
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inline void IPToP(const Point3i & pi, Point3<ScalarType> &p ) const
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/* Given a cell index return the lower corner of the cell
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* @param integer coordinates pi of the cell
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* @return p is a 3D point representing the lower corner of the cell
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*/
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inline void IPToP(const Point3i & pi, CoordType &p ) const
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{
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p[0] = ((ScalarType)pi[0])*voxel[0];
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p[1] = ((ScalarType)pi[1])*voxel[1];
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p[2] = ((ScalarType)pi[2])*voxel[2];
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p +=bbox.min;
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p += bbox.min;
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}
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/// Dato un box reale ritorna gli indici dei voxel compresi dentro un ibox
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/* Given a cell in <ScalarType> coordinates, compute the corresponding cell in integer coordinates
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* @param b is the cell in <ScalarType> coordinates
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* @return ib is the correspondent box in integer coordinates
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*/
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void BoxToIBox( const Box3x & b, Box3i & ib ) const
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{
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PToIP(b.min,ib.min);
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PToIP(b.max,ib.max);
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PToIP(b.min, ib.min);
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PToIP(b.max, ib.max);
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//assert(ib.max[0]>=0 && ib.max[1]>=0 && ib.max[2]>=0);
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}
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/* Given a cell in integer coordinates, compute the corresponding cell in <ScalarType> coordinates
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* @param ib is the cell in integer coordinates
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* @return b is the correspondent box in <ScalarType> coordinates
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*/
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/// Dato un box in voxel ritorna gli estremi del box reale
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void IBoxToBox( const Box3i & ib, Box3x & b ) const
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{
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IPtoP(ib.min,b.min);
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IPtoP(ib.max,b.max);
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}
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};
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};
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/** Calcolo dimensioni griglia.
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Calcola la dimensione della griglia in funzione
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@ -142,7 +160,7 @@ namespace vcg {
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void BestDim( const int elems, const Point3<scalar_type> & size, Point3i & dim )
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{
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const int mincells = 1; // Numero minimo di celle
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const double GFactor = 1.0; // GridEntry = NumElem*GFactor
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const double GFactor = 1; // GridEntry = NumElem*GFactor
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double diag = size.Norm(); // Diagonale del box
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double eps = diag*1e-4; // Fattore di tolleranza
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