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#ifndef VIEW_H
#define VIEW_H
#include "random.h"
#include "vec3.h"
#include <cmath>
struct View
{
static constexpr auto vup = vec3(0, 1, 0); // Camera-relative "up" direction
float fieldOfView = 90.f;
point3 camera {0, 0.5, 0.5};
point3 lookat {0, 0, -1}; // Point camera is looking at
float focalLength;
float viewportHeight;
float viewportWidth;
vec3 viewportX;
vec3 viewportY;
vec3 pixelDX;
vec3 pixelDY;
vec3 viewportUL;
vec3 pixelUL;
View() {
recalculate();
}
void recalculate() {
focalLength = (camera - lookat).length();
viewportHeight = 2 * std::tan(fieldOfView * 3.14159265 / 180.0 / 2.0) * focalLength;
viewportWidth = viewportHeight * Aspect;
const auto w = (camera - lookat).normalize();
const auto u = cross(vup, w).normalize();
const auto v = cross(w, u);
viewportX = viewportWidth * u;
viewportY = -viewportHeight * v;
pixelDX = viewportX / Width;
pixelDY = viewportY / Height;
viewportUL = camera - focalLength * w - viewportX / 2 - viewportY / 2;
pixelUL = viewportUL + 0.5 * (pixelDX + pixelDY);
}
ray getRay(int x, int y, bool addRandom = false) const {
double X = x;
double Y = y;
if (addRandom) {
X += randomN() - 0.5;
Y += randomN() - 0.5;
}
auto pixel = pixelUL + X * pixelDX + Y * pixelDY;
return ray(camera, pixel - camera);
}
};
#endif // VIEW_H
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