Try FluidRay RT Beta and use it in your works for free! This version has all the features of the paid version, no limited resolution or watermarks! Simply extract it and run setup.
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Download FluidRay RT 0.9.5 real-time renderer:
You can find more FluidRay RT sample projects and addons at the bottom of the page.
If you need an .obj importer plugin for Google Sketchup, you can check out FluidImporter.
FluidImporter is super fast (entirely written in C++) and completely free. For SketchUp 2013 users: FluidImporter 1.0 is not compatible with SketchUp 2013. Download FluidImporter 2.0 for SketchUp 2013 30-Day trial instead: