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question about "Quaternion rotation"

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This is tutorial link and I made this node with that.

and I heard about quaternion that it has only 4 vectors so We can use it more efficient way to rotate object.

But this tutorial's node convert quaternion to matrix at last.

so If I want to use this node properly and I expected, using quaternion.

Which part that I should change ??


Sorry for my poor English and Help me wizards !


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I just tweaked a little bit and made tihs by using quaternion.

but, is this efficient than upper one ??

Give me advice so I can make this properly please !

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during made those things, I just tought "Should I have to make quaternion to matrix ?, then why are they saying 'quaternion is more efficient on caculating' ?? at last they has to convert it to matrix. Am I worong .. ??

The key point that I want to know is, 'How can I rotate object by using quaternion ?'

I use box object as this node's input and it worked as good. but I want to rotate it by using quaternion ..

I don't know I wrote right ,,, sorry for my English again haha

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