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Aug
29
answered Quaternion for an object that to point in a direction
Aug
25
answered The Euclidean norm ||r|| of a rotation
Aug
22
comment Rotate Quaternion A by 180 degrees
@ina So was it of any help? If yes, up-voting (and maybe accepting) would be appreciated.
Aug
22
awarded  Editor
Aug
22
revised Looking for numerical methods for finding local maxima and minima of a function
added 68 characters in body
Aug
22
answered How to transform location and rotation parts individually?
Aug
21
answered Looking for numerical methods for finding local maxima and minima of a function
Aug
10
comment Plane and Matrix Question
@J. M. The plane axis, as the tank stands on the plane.
May
22
awarded  Supporter
May
16
comment Rotate Quaternion A by 180 degrees
But remember the order of multiplication. The one on the right is applied first when rotating a vector by the new quaternion. So (0,0,1,0) * q should do what you want.
May
16
comment Rotate Quaternion A by 180 degrees
Yes, that should work. Just remember axis/angle rotation (a,x,y,z) is equal to quaternion (cos(a/2),xsin(a/2),ysin(a/2),z*sin(a/2)).
May
15
awarded  Teacher
May
15
answered Rotate Quaternion A by 180 degrees