Path: utzoo!attcan!uunet!ns-mx!iowasp.physics.uiowa.edu!maverick.ksu.ksu.edu!zaphod.mps.ohio-state.edu!julius.cs.uiuc.edu!apple!agate!eos!data.nas.nasa.gov!sun499!hultquis From: hultquis@nas.nasa.gov (Jeff P. M. Hultquist) Newsgroups: comp.graphics Subject: Graphics Gems erratum Message-ID: Date: 15 Nov 90 19:24:38 GMT Sender: news@nas.nasa.gov Reply-To: hultquis@nas.nasa.gov Distribution: comp Organization: NAS - Applied Research Office, NASA Ames Lines: 16 I recently found a bug in one of the items in "Graphics Gems". On page 463 (the code for a "virtual trackball"), the second-to-last line should read "(pi-alpha)" instead of "(alpha + pi/2)". This becomes obvious as soon as you try to implement the silly thing. As the author of this piece of foolishness, I apologize. -- jeff -- -- Jeff Hultquist hultquis@nas.nasa.gov NASA - Ames Research Center (415) 604-4970 Disclaimer: "I am not a rocket scientist."