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Rotates a group around its rotation center.
To set the rotation center call: STATE_group_set_rotate_reference_point()
Groups that include a rotated polygon (See STATE_polygon_is_rotated ) cannot
be rotated using this function (You can call this function but it will have no effect)
Parameters:
group_handle:
A NULL group_handle means the whole world
degrees: In how many degrees to rotate the group.
space_flag: CAMERA_SPACE, OBJECT_SPACE, WORLD_SPACE
axis_flag: 0 for the X axis. 1 for the Y axis. 2 for the Z axis
see also STATE_group_is_rotation_enabled()
STATE_group_set_rotate_reference_point()
STATE_group_get_center_of_mass()
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