150 lines
5.1 KiB
C++
150 lines
5.1 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) 2004 \/)\/ *
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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 1.4 2004/05/12 20:55:18 ponchio
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*** empty log message ***
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Revision 1.3 2004/03/31 15:06:41 ponchio
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#include <camera> -> #include <view>
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Revision 1.2 2004/03/25 14:55:25 ponchio
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Adding copyright.
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****************************************************************************/
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#ifndef FRUSTUM_H
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#define FRUSTUM_H
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#include <wrap/gui/view.h>
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#include <vcg/space/plane3.h>
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#include <vcg/space/line3.h>
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namespace vcg {
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template <class T> class Frustum: public View<T> {
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public:
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void GetView();
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Point3<T> ViewPoint();
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T Resolution(float dist = 1);
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bool IsOutside(Point3<T> &point);
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bool IsOutside(Point3<T> &point, T radius);
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T Distance(Point3<T> &point, int plane);
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protected:
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T resolution;
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Plane3<T> planes[6];
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Point3<T> view_point;
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};
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typedef Frustum<float> Frustumf;
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typedef Frustum<double> Frustumd;
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//Implementation
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template <class T> Point3<T> Frustum<T>::ViewPoint() {
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return view_point;
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}
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template <class T> T Frustum<T>::Resolution(float dist) {
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return resolution * dist;
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}
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template <class T> bool Frustum<T>::IsOutside(Point3<T> &point) {
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Point3<T> r = Project(point);
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if(r[0] < viewport[0] || r[0] > viewport[0]+viewport[2] ||
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r[1] < viewport[1] || r[1] > viewport[1]+viewport[3])
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return true;
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return false;
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}
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template <class T> bool Frustum<T>::IsOutside(Point3<T> &point, T radius) {
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for(int i = 0; i < 4; i++) {
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T dist = Distance(point, i);
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if(dist < -radius)
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return true;
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}
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return false;
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}
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template <class T> T Frustum<T>::Distance(Point3<T> &point, int plane) {
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return Distance(point, planes[plane]);
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}
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template <class T> void Frustum<T>::GetView() {
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View<T>::GetView();
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// Point3d NE, SE, SW, NW, ne, se, sw, nw;
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int t = viewport[1] + viewport[3];
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int b = viewport[1];
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int r = viewport[0] + viewport[2];
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int l = viewport[0];
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Point3<T> nw = UnProject(Point3<T>(l, b, 0));
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Point3<T> sw = UnProject(Point3<T>(l, t, 0));
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Point3<T> ne = UnProject(Point3<T>(r, b, 0));
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Point3<T> se = UnProject(Point3<T>(r, t, 0));
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Point3<T> NW = UnProject(Point3<T>(l, b, 1));
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Point3<T> SW = UnProject(Point3<T>(l, t, 1));
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Point3<T> NE = UnProject(Point3<T>(r, b, 1));
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Point3<T> SE = UnProject(Point3<T>(r, t, 1));
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/* gluUnProject(l,b,0,model,proj,viewport,&nw[0], &nw[1], &nw[2]);
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gluUnProject(l,t,0,model,proj,viewport,&sw[0], &sw[1], &sw[2]);
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gluUnProject(r,b,0,model,proj,viewport,&ne[0], &ne[1], &ne[2]);
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gluUnProject(r,t,0,model,proj,viewport,&se[0], &se[1], &se[2]);
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gluUnProject(l,b,1,model,proj,viewport,&NW[0], &NW[1], &NW[2]);
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gluUnProject(l,t,1,model,proj,viewport,&SW[0], &SW[1], &SW[2]);
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gluUnProject(r,b,1,model,proj,viewport,&NE[0], &NE[1], &NE[2]);
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gluUnProject(r,t,1,model,proj,viewport,&SE[0], &SE[1], &SE[2]);*/
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view_point = View<T>::ViewPoint();
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planes[0].Init(view_point, nw, ne);
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planes[1].Init(view_point, ne, se);
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planes[2].Init(view_point, se, sw);
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planes[3].Init(view_point, sw, nw);
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planes[4].Init(se, sw, nw);
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planes[5].Init(SW, SE, NE);
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for(int i = 0; i < 6; i++)
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planes[i].Normalize();
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//calcoliamo la risoluzione: dimenzione di un pixel a distanza 1 dal view_point
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resolution = ((ne + NE) - (nw + NW)).Norm() /( viewport[2] * ((ne + NE) - view_point).Norm());
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}
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}//namespace
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#endif
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