as Dust Rider breifly mentioned before: In Addition to Daz Studio's ability to use 3Delight (in a very simplified form and the more "realistic" Uber Envirornment) both Daz Studio and Poser can utilize the LuxRender engine which approaches rendering very differently than 3Delight and Firefily.

for Daz Studio 3.1.2.34 you have two options with LuxRender

Reality (www.preta3d.com, and here on renderosity.com)

and the free LuxRenderDS (http://www.luxrender.net/wiki/LuxRenderDS) plug-in

 

In Daz Studio 4 you can only use Reality since LuxRenderDS is not available.

 

In Poser you can use the Pose2Lux plugin (http://www.pose2lux.com/)

 

Check out http://www.luxrender.net/ for details on LuxRender