01/31/2002
15-462 Graphics I
15
Implementing the Look-At Function
•(1)
Transform world frame to camera frame
•Compose
a rotation R with translation T
•W = T
R
•(2)
Invert W to obtain viewing transformation V
•V = W-1 = (T R)-1 = R-1 T-1
•Derive
R, then T, then R-1 T-1