Poser exports the 'Spline-based' dynamic hair as a polygonal representation. Dynamic hair in Poser isn't polygonal (at least in the way it exports). Any hair polygons in Poser are generated for the Document window and renderer. If you import the mesh back into Poser, you won't get back your dynamic hair. You'll just have that polygonal mesh!

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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