Lerp vs Slerp
• Lerp interpolates in a straight line
• useful for interpolating positions
• Slerp rotates around (0,0)
• useful for interpolating directions
#unitytipspic.twitter.com/KSQQWCb5f4
This diagram is not correct. The direction deviation in quaternion space is not the same magnitude as the deviation in rotation space. Quaternions are a non-linear transform (and are double covered) so errors in quaternion space map to smaller errors in perceived rotation.
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It's visualizing Vector Lerp vs Vector Slerp, not quaternion slerp :)
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How odd - so Unity has a SLERP operation for non-quaternions?
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