Try the following:
call T the transform the aligns the shared edge with an axis
let R be the rotation about that axis
T^(-1) is the inverse transform that translates that face of
the box back where it belongs.
ther order of transformation is
T^(-1) ( R ( T ( box face )))
Lily Lee
>
> dear all:
> i try to animate the process of unfolding a box, and the box is formed by six planes
>of rectangle. But when i rotate the rectangle with 90 degree along the share edge, it
>is found that the rectangle is rotate around the centre. It is roatate around centre
>with 90 degree ,but not the share edge.
> i try many method ,but still can't solve that, can anyone help me?
>
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