Lecture 9: Ray Tracing (18)
philippe-eecs

This is how lines are defined in parametric equations! Essentially just a parametric equation of a slowly scaled up vector.

briana-jin-zhang

The equation for lines are the same format, but there is a slight difference here in that you can't have light "behind" the origin, whereas a light is infinite. This is denoted by how $$0 \leq t < \infty$$.

briana-jin-zhang

I meant $0 \leq t < \infty$ :/ latex not doing what I want again