I''m currently working on a program that uses Quaternion''s. I''ve got almost everything working however I''m haveing a little bit of a problem with one thing. I can rotate the scene by getting the rotation matrix and passing it in glMultMatrix. The problem I need to solve is that I have to find the vector representing a distance in that direction i.e. vector = quaternion * distance; of all the information I''ve found on quaternions this is the only thing I need that hasn''t been covered anywhere! If anyone could point me twords any information I would appreciate it. An alternative to this would be to get the seperate euler angels and then calculate the point but I don''t know how to extract the angles from the quaternion eather.

Ok, I got that working. Now all I need to know about Quaternion''s is how to limit one or more of the axis of rotation?
Any sugestions???