"For whatever reason, Poser is a product that people will pay money for add ons, and in that sense there really isn't anything else like it." Well, one could argue that point. 3dsMax, for instance, has a HUGE selection of plugins (many for free, but also many for pay) that are much more robust than any other 3d software out there. The plugin libraries for 3ds are vast. Plus, there are companies like Digimation who's sole business is producing plugin content for 3dsMax, much like Daz produces content for Poser. Not to mention all the .3ds/.max specific models for sale out there dwarfs those available for Poser. Dosche 3D makes tons of content specifically for 3dsMax also. So what I'm trying to say is that Poser isn't the only 3D software people are willing to pay money for add ons, and in reality, doesn't have nearly the economy of some other apps.

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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.