I think that is a design problem, try to create the object that you
want rotate in the origin of coordinates. For example if you want to
create a triangle that can rotate in is own center you must define this
coordinates:
{[0,3,0], [-3,-3,0], [3,-3,0]}
If you have created your object with a editor like 3DStudio, try to
translate the object to the origin and fit the Pivot in his center.
You will be able to rotate the object freeway.
I hope this will be useful for you.
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