Re: quaternions revisited

Jim Helman (jimh++at++surreal)
Fri, 29 Sep 95 16:49:53 -0700

• Next message: Jim Helman: "Re: IRIX IPC"
• Previous message: Jim Helman: "Re: pfMakePerspFrust and pfEarthSky"
• In reply to: Ulf Yngve: "pfMakePerspFrust and pfEarthSky"

     For more information on quaternions, see the article by Sir William
     Rowan Hamilton "On quaternions; or on a new system of imaginaries in
     algebra," in the Philosophical Magazine, xxv pp. 10-13 (July 1844).
     More recent references include "Animating Rotation with Quaternion
     Curves," SIGGRAPH Proceedings Vol 19, Number 3, 1985, and "Quaternion
     Calculus For Animation," in "Math for SIGGRAPH", Course Notes, #23,
     SIGGRAPH 1989, both by Ken Shoemake. Note that for consistency with
     Performer's transformation order, pfQuats are the conjugates of the
     quaternions described in these references.

There's a *very* nice little tutorial paper available on.
ftp://ftp.cis.upenn.edu/pub/graphics/shoemake

rgds,

-jim helman

jimh++at++surreal.asd.sgi.com
415/390-1151

• Next message: Jim Helman: "Re: IRIX IPC"
• Previous message: Jim Helman: "Re: pfMakePerspFrust and pfEarthSky"
• In reply to: Ulf Yngve: "pfMakePerspFrust and pfEarthSky"

This archive was generated by hypermail 2.0b2 on Mon Aug 10 1998 - 17:51:55 PDT

This message has been cleansed for anti-spam protection. Replace '++at++' in any mail addresses with the '@' symbol.