Raytracing

Note

A 3D rendering technique that simulates light behaviour by tracing light paths from a virtual camera into a scene.

Uses Raycasting except it’s done from all possible light sources except instead of just a collision between the ray and an object,

We have a ray of origin $o\in {\mathbb{R}}^3$ with a direction $d\in {\mathbb{R}}^3$ (which has parametric form $r(t)=o+td$). Many intersection tests just boil down to “solve for $t$ and then check if $t$ is in a valid range”.

Ray plane intersections follow normal Plane Intersections