> 1-can I change the center(pivot) of an object?

Presumably you mean the centre for rotations?  If so, it's worth
pointing out that all rotations are performed around <0,0,0>.  So, if
you want to rotate around the corner of a cube (for example), simply
make sure that the cube's corner is at <0,0,0> before applying the
rotation.

However, if you look into the "transforms.inc" file and its contents,
you'll find some useful macros such as Rotate_Around_Trans, which will
rotate an object around whatever point you specify.

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