Here's an extremely quick render I put together of TerraDome plus Dies Nefastus (which doesn't have Poser-optimized materials and I didn't bother to tweak them for this). 

This render uses IDL with smooth polygons turned off.  The lighting is a little off but I left it alone so you could see what it looks like "out of the box".  Dies Nefastus looks a little "blown out" from a lighting perspective but otherwise it's pretty good.  Dies Nefastus ould use some materials tinkering and the render needs some postwork and vegetation, but this took about 2-3 minutes to build with TerraDome (if that) and maybe 3-5 minutes of render time with IDL.  I have my render settings up pretty high. Cast shadows, displacement and raytracing were on.

BTW, I had to scale Terradome to 99% in order to get the ground to appear properly in the preview.

 

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