Course in Visualization and Computer Graphics Reflection Consider a ray with direction vector d being reflected from a mirroring surface into the direction of the reflection vector r. At the point of intersection, the surface has the normal vector n. See the figure below for the setup. (a) Given d and r, determine the normal vector n, of the surface at the point of reflection! (2P) (b) Given d and n, determine the direction vector r for the reflection of the ray! (3P) surface