[Chimera-users] trigonometry

[Thomas Goddard]

Hi Jean-Francois,

  The following web page gives a short block of code that determines
Euler angles (called heading, attitude, and bank on that page)

	http://www.euclideanspace.com/maths/geometry/rotations/conversions/matrixToEuler/index.htm

  That page also wisely suggests that you shouldn't convert to Euler angles
unless you have to -- for example if you are using a program that will only
accept Euler angles.  They have bad characteristics -- different sets of
Euler angles can be used to represent the same rotation.

	Tom