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nicer expression for the ray direction

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Dmitry V. Sokolov
2019-01-23 22:41:38 +01:00
parent 4595c176d3
commit e203962cea
2 changed files with 5 additions and 3 deletions
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1
geometry.h
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@@ -81,3 +81,4 @@ template <size_t DIM, typename T> std::ostream& operator<<(std::ostream& out, co
return out ;
}
#endif //__GEOMETRY_H__

7
tinyraytracer.cpp
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@@ -127,9 +127,9 @@ void render(const std::vector<Sphere> &spheres, const std::vector<Light> &lights
#pragma omp parallel for
for (size_t j = 0; j<height; j++) {
for (size_t i = 0; i<width; i++) {
float x = (2*(i + 0.5)/(float)width - 1)*tan(fov/2.)*width/(float)height;
float y = -(2*(j + 0.5)/(float)height - 1)*tan(fov/2.);
Vec3f dir = Vec3f(x, y, -1).normalize();
float x = (i + 0.5) - width/2.;
float y = -(j + 0.5) + height/2.; // flips the image at the same time
Vec3f dir = Vec3f(x, y, -height/(2.*tan(fov/2.))).normalize();
framebuffer[i+j*width] = cast_ray(Vec3f(0,0,0), dir, spheres, lights);
}
}
@@ -169,3 +169,4 @@ int main() {
return 0;
}