"And a broader problem with doing "honest" physics in the digital world is that our props and figures have no representation of mass and friction" In some applications you can assign mass and friction to objects to approximate physics calculations such as velocity, momentum, etc. right down to the vertex level. You can actually "paint" different weights on different vertices or polys to react with gravity. However, this is something not yet possible in poser. :-(

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.