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Quaternions XYZW and WXYZ

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I'm using quaternions in my program. My layout for the quaternion is w,x,y,z. I am trying to set up physx in my program and it uses quaternions that are laid out x,y,z,w. if i wanted to over load the = operator for the two would does the order of the lay out matter? or would i just set them to equal like pairs. x=x y=y z=z w=w? or is there some mathematical reason why the lay out is important that i am unaware of?

Thanks

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