Lecture 9: Intro to Ray-Tracing & Accelerating Ray-Scene Intersection (23)
jierui-cell
t here can be thought of as the distance from the line to the circle. When t is greater than the radius, the line is outside the circle. When t equals to the radius, the line is tangent to the circle. And when t is less than the radius, the line intersects with the circle.
patilatharva
I'm not sure t can be thought of as the distance from the line to the circle - for example, if there's a ray originating far away from a small sphere that it intersects, it's entirely possible that t can be greater than the radius even when an intersection happens.
t here can be thought of as the distance from the line to the circle. When t is greater than the radius, the line is outside the circle. When t equals to the radius, the line is tangent to the circle. And when t is less than the radius, the line intersects with the circle.
I'm not sure t can be thought of as the distance from the line to the circle - for example, if there's a ray originating far away from a small sphere that it intersects, it's entirely possible that t can be greater than the radius even when an intersection happens.