Hm. How do you define one centimeter in a wavefront obj-file imported into Poser? Or with any other 3 dimensional object? Such an object consists of values between -1.0 and 1.0 (standard, not only for Poser).

Poser isn't CAD.

With 3D "anything is relative". All 3D-objects are measured relative to a fictional 3D-World (the reaseon why scaling is done in percent; relative to the worlds bounding box). An objects position is relative to it's origin in 3D-space ( measured in values between -1.0 and 1.0).

Perhaps you may look at Dr.Geeps tutorial to find a solution for this well known problem.

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