Q. Shown below is the unfolded cube map of six faces. Suppose that a reflection ray is computed and its direction is along (0.5, 0.4, −0.2).

sorry for weird rotated picture. I can't rotate properly.

(a) Which face of the cube map does the reflection ray hit?

A. face +x is selected.

(b) What are the 2D coordinates of the intersection point between the reflection ray and the face?

A. The point hit by R has the yz -coordinates (0.8, −0.4) at face +x.

(c) Compute the texture coordinates corresponding to the intersection point.

A. (0.3, 0.9)

 

2+ +y -Y -2 +x Y -X +y 8. -Y Y 2. X z+ X +x y y 4 X