paul@hpfclk.UUCP (12/30/83)
#N:hpfclk:6300003:000:418 hpfclk!paul Dec 27 10:46:00 1983 Any references/helpful hints to this problem would be greatly appreciated - we have a solution but am curious if it is the best (w.r.t. number of operations). What is the quickest way to determine if a ray intersets a sphere? (the origin of the ray may be inside/outside the sphere) The solution we have takes 8 additions, 7 multiplies, 1 divide, and 3 compares. Paul Beiser ...hplabs!hpfcla!paul