Quaternions and 3d rotation, explained interactively

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Previous video on Quaternions:    • Visualizing quaternions (4d numbers) ...   Nice explanation of Gimbal Lock:    • Euler (gimbal lock) Explained   Great videos comparing Euler angles and quaternions, from the perspective of an animator:    • Humane Rigging 03 - 3D Bouncy Ball 04...      • Humane Rigging 03 - 3D Bouncy Ball 05...   Music by Vincent Rubinetti:
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