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This is a very powerfull function for doing polygon reduction.
optimization_level: a bigger number will give a stronger polygon reduction.
one should play with this value to achieve the optimum result.
tipical values are 0.1, 1, 10 , 100.
a value of 1 for example will snap the model into a grid that
its smallest unit is 1.
returns a handle to the new group of polygons.
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