normalize quaternion after operation

[yangfengzzz]

Describe the bug
quaternion must be normalized otherwise it contain the scale information which will make the further calculation wrong!

To Reproduce
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2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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Desktop (please complete the following information):

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• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

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• OS: [e.g. iOS8.1]
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• Version [e.g. 22]

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[GuoLei1990]

Has solved in #693