209 lines
6.5 KiB
C++
209 lines
6.5 KiB
C++
/****************************************************************************
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* VCGLib o o *
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* Visual and Computer Graphics Library o o *
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* _ O _ *
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* Copyright(C) 2005 \/)\/ *
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* Visual Computing Lab /\/| *
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* ISTI - Italian National Research Council | *
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* \ *
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* All rights reserved. *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License (http://www.gnu.org/licenses/gpl.txt) *
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* for more details. *
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* *
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****************************************************************************/
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/****************************************************************************
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History
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$Log: not supported by cvs2svn $
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Revision 1.7 2005/10/02 23:16:26 cignoni
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English comment and moved typedef to public scope
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Revision 1.6 2005/09/30 13:12:46 pietroni
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basic grid class is derived from Indexing base class defined in base,h
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Revision 1.5 2005/09/16 11:56:38 cignoni
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removed wrong typename and added ending \n
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Revision 1.4 2005/08/02 11:01:05 pietroni
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added IPToP and IBoxToBox functions, modified BoxToIBox function in order to use PToIP function
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Revision 1.3 2005/07/28 06:11:12 cignoni
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corrected error in GridP (did not compile)
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Revision 1.2 2005/07/01 11:33:36 cignoni
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Added a class BasicGrid with some utility function that are scattered among similar classes
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Revision 1.1 2005/03/15 11:43:18 cignoni
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Removed BestDim function from the grid_static_ptr class and moved to a indipendent file (grid_util.h) for sake of generality.
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****************************************************************************/
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#ifndef __VCGLIB_GRID_UTIL
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#define __VCGLIB_GRID_UTIL
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#include<vcg/space/index/base.h>
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#include<vcg/space/box3.h>
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#include <vcg/space/index/space_iterators.h>
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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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template <class OBJTYPE, class SCALARTYPE>
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class BasicGrid:public SpatialIndex<OBJTYPE,SCALARTYPE> {
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public:
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typedef typename Box3<ScalarType> Box3x;
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typedef typename SCALARTYPE ScalarType;
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typedef typename Point3<SCALARTYPE> CoordType;
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typedef typename OBJTYPE ObjType;
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typedef typename OBJTYPE* ObjPtr;
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typedef typename 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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// Dato un punto ritorna le coordinate della cella
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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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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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{
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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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}
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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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{
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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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}
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/// Dato un box reale ritorna gli indici dei voxel compresi dentro un ibox
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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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//assert(ib.max[0]>=0 && ib.max[1]>=0 && ib.max[2]>=0);
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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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/** Calcolo dimensioni griglia.
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Calcola la dimensione della griglia in funzione
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della ratio del bounding box e del numero di elementi
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*/
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template<class scalar_type>
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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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double diag = size.Norm(); // Diagonale del box
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double eps = diag*1e-4; // Fattore di tolleranza
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assert(elems>0);
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assert(size[0]>=0.0);
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assert(size[1]>=0.0);
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assert(size[2]>=0.0);
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int ncell = int(elems*GFactor); // Calcolo numero di voxel
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if(ncell<mincells)
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ncell = mincells;
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dim[0] = 1;
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dim[1] = 1;
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dim[2] = 1;
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if(size[0]>eps)
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{
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if(size[1]>eps)
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{
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if(size[2]>eps)
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{
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double k = pow((double)(ncell/(size[0]*size[1]*size[2])),double(1.0/3.f));
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dim[0] = int(size[0] * k);
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dim[1] = int(size[1] * k);
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dim[2] = int(size[2] * k);
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}
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else
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{
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dim[0] = int(::sqrt(ncell*size[0]/size[1]));
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dim[1] = int(::sqrt(ncell*size[1]/size[0]));
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}
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}
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else
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{
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if(size[2]>eps)
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{
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dim[0] = int(::sqrt(ncell*size[0]/size[2]));
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dim[2] = int(::sqrt(ncell*size[2]/size[0]));
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}
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else
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dim[0] = int(ncell);
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}
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}
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else
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{
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if(size[1]>eps)
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{
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if(size[2]>eps)
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{
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dim[1] = int(::sqrt(ncell*size[1]/size[2]));
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dim[2] = int(::sqrt(ncell*size[2]/size[1]));
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}
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else
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dim[1] = int(ncell);
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}
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else if(size[2]>eps)
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dim[2] = int(ncell);
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}
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dim[0] = math::Max(dim[0],1);
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dim[1] = math::Max(dim[1],1);
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dim[2] = math::Max(dim[2],1);
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}
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}
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#endif
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