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  1. Thank you Wingnut and Sam for your quick replies. Quaternion is a brilliant solution although I still need to dig deeper into the math. PS: I'm so glad to join this forum and appreciate the warming welcome!
  2. Hi, I've experienced weird problem when I try to rotate an imported gltf mesh. It turns super fast and seems not logic at all. Someone has any idea why? Or is it a bug? Here is the playground example to show this problem. Thank you. http://www.babylonjs-playground.com/#742772#3