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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.

This commit is contained in:
Paolo Cignoni 2005-03-15 11:43:18 +00:00
parent 27694f7a67
commit e974b9c948
2 changed files with 114 additions and 75 deletions
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78
vcg/space/index/grid_static_ptr.h
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@ -24,6 +24,9 @@
History History
$Log: not supported by cvs2svn $ $Log: not supported by cvs2svn $
Revision 1.11 2005/01/03 11:21:26 cignoni
Added some casts
Revision 1.10 2004/09/28 10:25:05 ponchio Revision 1.10 2004/09/28 10:25:05 ponchio
SetBox minimal change. SetBox minimal change.
@ -68,7 +71,7 @@ Initial commit
#include <vcg/space/box3.h> #include <vcg/space/box3.h>
#include <vcg/space/line3.h> #include <vcg/space/line3.h>
#include <vcg/space/index/grid_util.h>
namespace vcg { namespace vcg {
/** Static Uniform Grid /** Static Uniform Grid
@ -455,79 +458,6 @@ class GridStaticPtr
} }
/** Calcolo dimensioni griglia.
Calcola la dimensione della griglia in funzione
della ratio del bounding box e del numero di elementi
*/
static void BestDim( const int elems, const Point3x & size, Point3i & dim )
{
const int mincells = 1; // Numero minimo di celle
const double GFactor = 1.0; // GridEntry = NumElem*GFactor
double diag = size.Norm(); // Diagonale del box
double eps = diag*1e-4; // Fattore di tolleranza
assert(elems>0);
assert(size[0]>=0.0);
assert(size[1]>=0.0);
assert(size[2]>=0.0);
int ncell = int(elems*GFactor); // Calcolo numero di voxel
if(ncell<mincells)
ncell = mincells;
dim[0] = 1;
dim[1] = 1;
dim[2] = 1;
if(size[0]>eps)
{
if(size[1]>eps)
{
if(size[2]>eps)
{
double k = pow((double)(ncell/(size[0]*size[1]*size[2])),double(1.0/3.f));
dim[0] = int(size[0] * k);
dim[1] = int(size[1] * k);
dim[2] = int(size[2] * k);
}
else
{
dim[0] = int(::sqrt(ncell*size[0]/size[1]));
dim[1] = int(::sqrt(ncell*size[1]/size[0]));
}
}
else
{
if(size[2]>eps)
{
dim[0] = int(::sqrt(ncell*size[0]/size[2]));
dim[2] = int(::sqrt(ncell*size[2]/size[0]));
}
else
dim[0] = int(ncell);
}
}
else
{
if(size[1]>eps)
{
if(size[2]>eps)
{
dim[1] = int(::sqrt(ncell*size[1]/size[2]));
dim[2] = int(::sqrt(ncell*size[2]/size[1]));
}
else
dim[1] = int(ncell);
}
else if(size[2]>eps)
dim[2] = int(ncell);
}
dim[0] = math::Max(dim[0],1);
dim[1] = math::Max(dim[1],1);
dim[2] = math::Max(dim[2],1);
}
int MemUsed() int MemUsed()
{ {

109
vcg/space/index/grid_util.h Normal file
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@ -0,0 +1,109 @@
/****************************************************************************
* VCGLib o o *
* Visual and Computer Graphics Library o o *
* _ O _ *
* Copyright(C) 2005 \/)\/ *
* Visual Computing Lab /\/| *
* ISTI - Italian National Research Council | *
* \ *
* All rights reserved. *
* *
* 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. *
* *
* 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 (http://www.gnu.org/licenses/gpl.txt) *
* for more details. *
* *
****************************************************************************/
/****************************************************************************
History
$Log: not supported by cvs2svn $
****************************************************************************/
#ifndef __VCGLIB_GRID_UTIL
#define __VCGLIB_GRID_UTIL
/** Calcolo dimensioni griglia.
Calcola la dimensione della griglia in funzione
della ratio del bounding box e del numero di elementi
*/
namespace vcg {
template<class scalar_type>
void BestDim( const int elems, const Point3<scalar_type> & size, Point3i & dim )
{
const int mincells = 1; // Numero minimo di celle
const double GFactor = 1.0; // GridEntry = NumElem*GFactor
double diag = size.Norm(); // Diagonale del box
double eps = diag*1e-4; // Fattore di tolleranza
assert(elems>0);
assert(size[0]>=0.0);
assert(size[1]>=0.0);
assert(size[2]>=0.0);
int ncell = int(elems*GFactor); // Calcolo numero di voxel
if(ncell<mincells)
ncell = mincells;
dim[0] = 1;
dim[1] = 1;
dim[2] = 1;
if(size[0]>eps)
{
if(size[1]>eps)
{
if(size[2]>eps)
{
double k = pow((double)(ncell/(size[0]*size[1]*size[2])),double(1.0/3.f));
dim[0] = int(size[0] * k);
dim[1] = int(size[1] * k);
dim[2] = int(size[2] * k);
}
else
{
dim[0] = int(::sqrt(ncell*size[0]/size[1]));
dim[1] = int(::sqrt(ncell*size[1]/size[0]));
}
}
else
{
if(size[2]>eps)
{
dim[0] = int(::sqrt(ncell*size[0]/size[2]));
dim[2] = int(::sqrt(ncell*size[2]/size[0]));
}
else
dim[0] = int(ncell);
}
}
else
{
if(size[1]>eps)
{
if(size[2]>eps)
{
dim[1] = int(::sqrt(ncell*size[1]/size[2]));
dim[2] = int(::sqrt(ncell*size[2]/size[1]));
}
else
dim[1] = int(ncell);
}
else if(size[2]>eps)
dim[2] = int(ncell);
}
dim[0] = math::Max(dim[0],1);
dim[1] = math::Max(dim[1],1);
dim[2] = math::Max(dim[2],1);
}
}
#endif