I need a good tut or three on quaternions. I''ve got a nice 3D engine setup with matrices, vertices, joints ... everything but quats. Cause I don''t know them. And most of the sites I''ve seen are more references or something on them; I want something that teaches me all about them so I can implement them in my own code. Anyone? Chris Barry

Well if it works already why would you want to use quaternions? They wont let you do anything you cant do with a Matrix

Because even though the math in the matrix class knows what it''s doing, I don''t I need to figure out how to store rotation info using keyframes and such (can you tell I learned this stuff from Brett Porter''s skeletal animation tutorial?) and I''m not smart enough to figure out how to get everything moving the way I want. I''m going to try dissecting that tutorial''s code and figure out what''s going on.

Chris Barry

You should check out the book Game Programming Gems. There are a few sections dealing with quaternions and their implementation.

Which one; aren''t there a few? And where and how much? And anywhere online I can check out for free?

Chris Barry