Why is there no |d|^2 term in the denominator?
From the last slide, we defined d as the unit direction vector. So taking the squared norm of d just gives us 1, i.e. |d|^2 = 1.
Why is there no |d|^2 term in the denominator?
From the last slide, we defined d as the unit direction vector. So taking the squared norm of d just gives us 1, i.e. |d|^2 = 1.