Operaguy: CATIA has a Photorealistic render application for final render. And the RTR (real time render) for design, like here in Poser.
The most RTR gets closer the Final Render, the better.
And there are many features (not being used) on current hardware/drivers today to acomplish that.
But today, RTR is not substitute of Software render.

Kingfisher: My system is able to render @ 4 fps (frames per second) in OpenGL (preview) a WinterQueen's animation. That means a scene with 4 WinterQueens will render only @ 1 fps in preview mode. And it gets difficult to work (too heavy).

Jimmy1: Thanks. Even that way, results are very different.

kawecki: Thanks. Good information for me.