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How to force an alignment between the cad model and the scanned workpiece?

Hi to every one,

I'm stuck with this problem: once I scan my workpiece I want to align the cad model so that a particular surface must be perfectly matched. In this way when I apply the colormap, that surface must be zeroed, therefore green.

I'm not able to do that, I only perform an automatic alignment (or taking manually the points) but the program seems to do the best fit without considering my needs. I tried to solve it by moving the CAD origins and aligning the axis along that surface but I didn't obtain any hoped result.

Thanks in advance for any help!

(Program PC-DMIS CAD++)
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