Talk:Conversion between quaternions and Euler angles

message: I was looking for the euler 123 to quaternion conversion that will rotate from one frame to another. The euler to quaternion conversion shown on the page does not line up with the SpinCalc euler 123 conversion from Matlab Central. Maybe the equation on the page rotates the points in a body while keeping the reference frame the same?
From SpinCalc.m with scalar at 4th position
 Q=[s1.*c2.*c3+c1.*s2.*s3,   c1.*s2.*c3-s1.*c2.*s3,   c1.*c2.*s3+s1.*s2.*c3,   c1.*c2.*c3-s1.*s2.*s3];  —Preceding unsigned comment added by 128.157.160.13 (talk) 22:42, 3 September 2009 (UTC)
thread_title:  Needs to be explicit that this rotates a body 

message: Does the order of rotation (described as "in the order yaw, pitch, roll" in first section) match the matrix given in "Rotation matrices" section?  That matrix corresponding to rotation with Euler angles can be given by (Rz (Ry Rx)). Isn't that in the order x,y,z instead? — Preceding unsigned comment added by 144.212.114.62 (talk)  22:25, 2 December 2006 (UTC)
thread_title:  Order of angles specified? 

message: The matrices given are for left-handed systems, whereas the drawing uses a right-handed convention. There is no way a beginner in the field can make sense of what is explained. Sam Hocevar (talk) 11:21, 30 April 2012 (UTC)
thread_title:  Matrices and handedness 

message: As above  — Preceding unsigned comment added by 128.2.176.70 (talk) 16:16, 11 June 2013 (UTC)
thread_title:  The reference does not exist anymore! 

message: ...then check this out.
http://bediyap.com/programming/convert-quaternion-to-euler-rotations/ [dead] --> https://web.archive.org/web/20210410215436/http://bediyap.com/programming/convert-quaternion-to-euler-rotations/
I haven't checked if it works, and I don't know the usage rights or licenses that apply to it (if any), but it accounts for multiple sets of Euler angles and it actually tells you which math goes with which set, so it's already better than this article by a mile. 108.3.188.161 (talk) 01:48, 22 July 2014 (UTC)
thread_title:  If someone needs a quaternion-to-Euler method that actually seems to work,... 

message: In the second figure,  showing the Tait-Bryant angles for an aircraft,  the upwards pitch is labelled in the figure as negative theta.  This pitch angle would be positive, it is counter-clockwise if you were remotely located on the aircraft's Y axis sticking out of its right wing direction.Lathamibird (talk) 07:10, 2 June 2015 (UTC)
thread_title:  Sign of pitch angle 

message: At the beginning of the section Definition, it's written "For the rest of this article, the "passive" JPL quaternion convention shall be used."
There are two problems with this:
1) I don't think this is right, both the rotation matrix and the quaternion product formulas seem to be consistent with Hamilton matrices instead.
2) The page Quaternions and spatial rotation makes very valid points on why Hamilton quaternions should be favored, so using only Hamilton quaternions here should be preferred. Ebernardes (talk) 14:31, 18 December 2022 (UTC)
thread_title:  This page says it deals with JPL quaternions, and I think it's not quite right 

message: This article reads like a stream of consciousness university lecture, rather than a Wikipedia article. I personally find the inclusion of sample code to be particularly out of place, but the POV of the article is really strange as well. I recommend that it be cleaned up. TimeEngineer (talk) 13:52, 28 January 2024 (UTC)
thread_title:  Cleanup