00001
00005 #include "PinholeCamera.h"
00006 #include "Ray.h"
00007 #include "Math.h"
00008 #include <math.h>
00009
00010 PinholeCamera::PinholeCamera(const Point& eye, const Point& lookat, const Vector& up,
00011 double hfov)
00012 : eye(eye), lookat(lookat), up(up), hfov(hfov)
00013 {
00014 }
00015
00016 PinholeCamera::~PinholeCamera()
00017 {
00018 }
00019
00020 void PinholeCamera::preprocess(double aspect_ratio)
00021 {
00022 lookdir = lookat-eye;
00023 lookdir.normalize();
00024 u = Cross(lookdir, up);
00025 v = Cross(u, lookdir);
00026 double ulen = tan(hfov/2.*M_PI/180.);
00027 u.normalize();
00028 u *= ulen;
00029 double vlen = ulen/aspect_ratio;
00030 v.normalize();
00031 v *= vlen;
00032 }
00033
00034 void PinholeCamera::makeRay(Ray& ray, const RenderContext& context, double x, double y) const
00035 {
00036 Vector direction = lookdir+u*x+v*y;
00037 direction.normalize();
00038 ray = Ray(eye, direction);
00039 }
