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But you must remember that most of the third party render engine use their Own shader Language.
try telling poser users they have to Dump ALL of their many texture Sets for V-Chick and redo everything from scratch using Vray or mental ray shaders and watch the reaction.

I don't think that would be any kind of a deterrent.

After all, haven't Poser users been doing that anyway with Poser's marginal shading system since version 5 or 6? I think a whole lot of people would jump at the chance to try Poser out with Mental Ray or Vray materials, not to mention the vastly superior lights types that come with those render engines.

It would work out well for merchants, too, having all kinds of new and improved shaders to sell for V-Chick. Wouldn't have to dump the texture sets as they could stil be used, just wouldn't have that one-click instant gratification...

On second thought, maybe you're right. ;-)