95 lines
2.9 KiB
C++
95 lines
2.9 KiB
C++
#ifndef FRUSTUM_H
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#define FRUSTUM_H
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#include <wrap/gui/camera.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 Camera {
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public:
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void GetView();
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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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Point3<T> ViewPoint();
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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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//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> 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<T>(point, planes[plane]);
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}
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template <class T> void Frustum<T>::GetView() {
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Camera::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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Point3d NE, SE, SW, NW, ne, se, sw, nw;
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gluUnProject(l, b, 0, model_matrix, proj_matrix, viewport, &nw[0], &nw[1], &nw[2]);
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gluUnProject(l, t, 0, model_matrix, proj_matrix, viewport, &sw[0], &sw[1], &sw[2]);
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gluUnProject(r, b, 0, model_matrix, proj_matrix, viewport, &ne[0], &ne[1], &ne[2]);
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gluUnProject(r, t, 0, model_matrix, proj_matrix, viewport, &se[0], &se[1], &se[2]);
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gluUnProject(l, b, 1, model_matrix, proj_matrix, viewport, &NW[0], &NW[1], &NW[2]);
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gluUnProject(l, t, 1, model_matrix, proj_matrix, viewport, &SW[0], &SW[1], &SW[2]);
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gluUnProject(r, b, 1, model_matrix, proj_matrix, viewport, &NE[0], &NE[1], &NE[2]);
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gluUnProject(r, t, 1, model_matrix, proj_matrix, viewport, &SE[0], &SE[1], &SE[2]);
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view_point = Camera::ViewPoint();
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planes[0].init(view_point, Point3<T>().Import(nw), Point3<T>().Import(ne));
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planes[1].init(view_point, Point3<T>().Import(ne), Point3<T>().Import(se));
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planes[2].init(view_point, Point3<T>().Import(se), Point3<T>().Import(sw));
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planes[3].init(view_point, Point3<T>().Import(sw), Point3<T>().Import(nw));
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planes[4].init(Point3<T>().Import(se), Point3<T>().Import(sw), Point3<T>().Import(nw));
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planes[5].init(Point3<T>().Import(SW), Point3<T>().Import(SE), Point3<T>().Import(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 = (T)((ne + NE) - (nw + NW)).Norm() /( viewport[2] * ((ne + NE) - (nw + NW)).Norm());
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}
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}//namespace
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#endif
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