03/26/2002
15-462 Graphics I
13
Ray-Sphere Intersection I
•Common
and easy case
•Define
sphere by
–Center
c = [xc yc zc
1]T
–Radius
r
–Surface
f(q) = (x – xc)2 + (y – yc)2+ (z – zc)2 – r2 = 0
•Plug
in ray equations for x, y, z:
