vcglib/wrap/gui/frustum.h

127 lines
4.9 KiB
C++

/****************************************************************************
* VCGLib o o *
* Visual and Computer Graphics Library o o *
* _ O _ *
* Copyright(C) 2004 \/)\/ *
* 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 $
Revision 1.2 2004/03/25 14:55:25 ponchio
Adding copyright.
****************************************************************************/
#ifndef FRUSTUM_H
#define FRUSTUM_H
#include <wrap/gui/view.h>
#include <vcg/space/plane3.h>
#include <vcg/space/line3.h>
namespace vcg {
template <class T> class Frustum: public Camera {
public:
void GetView();
bool IsOutside(Point3<T> &point);
bool IsOutside(Point3<T> &point, T radius);
T Distance(Point3<T> &point, int plane);
Point3<T> ViewPoint();
protected:
T resolution;
Plane3<T> planes[6];
Point3<T> view_point;
};
//Implementation
template <class T> Point3<T> Frustum<T>::ViewPoint() {
return view_point;
}
template <class T> bool Frustum<T>::IsOutside(Point3<T> &point) {
Point3<T> r = Project(point);
if(r[0] < viewport[0] || r[0] > viewport[0]+viewport[2] ||
r[1] < viewport[1] || r[1] > viewport[1]+viewport[3])
return true;
return false;
}
template <class T> bool Frustum<T>::IsOutside(Point3<T> &point, T radius) {
for(int i = 0; i < 4; i++) {
T dist = Distance(point, i);
if(dist < -radius)
return true;
}
return false;
}
template <class T> T Frustum<T>::Distance(Point3<T> &point, int plane) {
return Distance<T>(point, planes[plane]);
}
template <class T> void Frustum<T>::GetView() {
Camera::GetView();
Point3d NE, SE, SW, NW, ne, se, sw, nw;
int t = viewport[1] + viewport[3];
int b = viewport[1];
int r = viewport[0] + viewport[2];
int l = viewport[0];
Point3d NE, SE, SW, NW, ne, se, sw, nw;
gluUnProject(l, b, 0, model_matrix, proj_matrix, viewport, &nw[0], &nw[1], &nw[2]);
gluUnProject(l, t, 0, model_matrix, proj_matrix, viewport, &sw[0], &sw[1], &sw[2]);
gluUnProject(r, b, 0, model_matrix, proj_matrix, viewport, &ne[0], &ne[1], &ne[2]);
gluUnProject(r, t, 0, model_matrix, proj_matrix, viewport, &se[0], &se[1], &se[2]);
gluUnProject(l, b, 1, model_matrix, proj_matrix, viewport, &NW[0], &NW[1], &NW[2]);
gluUnProject(l, t, 1, model_matrix, proj_matrix, viewport, &SW[0], &SW[1], &SW[2]);
gluUnProject(r, b, 1, model_matrix, proj_matrix, viewport, &NE[0], &NE[1], &NE[2]);
gluUnProject(r, t, 1, model_matrix, proj_matrix, viewport, &SE[0], &SE[1], &SE[2]);
view_point = Camera::ViewPoint();
planes[0].init(view_point, Point3<T>().Import(nw), Point3<T>().Import(ne));
planes[1].init(view_point, Point3<T>().Import(ne), Point3<T>().Import(se));
planes[2].init(view_point, Point3<T>().Import(se), Point3<T>().Import(sw));
planes[3].init(view_point, Point3<T>().Import(sw), Point3<T>().Import(nw));
planes[4].init(Point3<T>().Import(se), Point3<T>().Import(sw), Point3<T>().Import(nw));
planes[5].init(Point3<T>().Import(SW), Point3<T>().Import(SE), Point3<T>().Import(NE));
for(int i = 0; i < 6; i++)
planes[i].Normalize();
//calcoliamo la risoluzione: dimenzione di un pixel a distanza 1 dal view_point
resolution = (T)((ne + NE) - (nw + NW)).Norm() /( viewport[2] * ((ne + NE) - (nw + NW)).Norm());
}
}//namespace
#endif