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Ray Tracing

1.1 Recap: Ray Tracing

Forward: 从光源出发，追踪光线打到眼睛。（低效，可能很多光没有进入眼睛）
Backward: 从眼睛出发，追踪打到光源的光线。

  • When ray hits a surface we perfrom shading:
    • "shading" determines what color you observe (along the way)
C++
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#include <iostream>
using namespace std;
int main() {
    return 0;
}
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for each pixel:
    ray = camera.getRay(pixel);
    c = scene.trace(ray, 0, +inf);
    image.set(pixel, c);

Scene::trace(ray, tMin, tMax):
    hit = surfaces.intersect(ray, tMin, tMax);
    if (hit)
        return hit.color();
    else 
        return backgroundColor;

The reflection equation

Reflected radiance is a (hemi)spherical integral of incident radiance from all directions

BRDF(Bidirectional reflectance distribution function)