Now you have the very simple Shaderlight in beta so free as plugin for free Google Sketchup
(so export from MOi in Skp format)
site of ShaderLlight http://www.artvps.com/

Else you have Kerkythea but some medium complexity ;) (stand alone or plugin of free Google Sketchup)
http://www.kerkythea.net/joomla/

The more easy is Podium
in free: limitation is 500*500
(always plugin of free Google Sketchup ;)
http://www.suplugins.com/



By Kargall Shaderlight


By Orgelf Shaderlight (+ toshop)