![]() with a bone's "X Rotation" driving the "Z Location" of a cube. ![]() A "Quaternion Rotation" in Blender 2.66 with "X = 0.233" results in the value "0.263" when using it in a "Single Variable Expression" in a "Driver" as can be seen here. Using "Quaternions" in older Blender versions can lead to wrong values within "Drivers". But using this in practice doesn't seem to me as easy as it sounds since even with a rotation around only one axis at a time, there're two values changing, "W" and either "X", "Y" or "Z". In the "Humane Rigging Course" (now in the Blender Cloud), the author gives an intuitive model for animations with "Quaternions" comparing their use with color mixing. When it comes to "Quaternions", the explanations by spikeyxxx are by far the best and most precise! So, I'm using them as orientation. I admire everybody who successfullly sets up a complex rig without becoming insane □! Kent's "Piero Rig" and Stan Paillereau's "Book Rig" are really awesome□□□!!! There's a lot of back and forth jumping which can easily lead to confusion. So, you try to fix it there and change the rig's behaviour in yet another place. If you "turn a screw" in one place, things change in another place and this maybe not as you intended it. Thanks, setting up such a complex rig is really tricky.
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