Ray
What is Ray? Ray is known as casting a ray line from a point (Ray Origin) in space to a point or to a certain direction (Ray Direction) in space. Literally, a ray is a line segment that starts at a point and extends in a direction. We can use two values to define a ray: the origin and the direction. What ever dimension space the ray is in, we can use the origin and direction to define a ray. Ok, so how to define a ray origin and direction? Commonly, we can use vectors to define the origin and direction. When it comes to vectors, Wow! 继续阅读“A Simple Introduction to Ray Algorithms”