RE: [Algorithms] Quaternion pre/post-multiply and pitching problems

[Jon W. <hp...@mi...>]

> I think i'm using relative coordinates. I use this scheme:
>
> - calculate delta x-movement
> - calculate delta y-movement
>
> pitch_quat.calculatepitch(delta_y)
> yaw_quat.calculateyaw(delta_x)
> totalrotation_quat = pitch_quat*yaw_quat*totalrotation_quat

This can't work, because calculatepitch() and calculateyaw() need to be done
_in the target's coordinate space_ (i e assuming the target is pointing
straight ahead). If you do calculations using a single quat, they're done in
absolute coordinates.

Cheers,

				/ h+