Do you think it might be a little patronizing to assume people don't understand that text inside notepad is being used as a display when there is a video showing it off?
This example is a cube and plane with one light. It is lines from the camera checked for collision against triangles then a line from the collision point checked against a light. Checking for collision against a triangle is just checking collision against the infinite plane and checking if that point is inside the triangle.
What is the "significance" you are talking about? This is something common with an uncommon display.