Zero Gravity was a very learnful project. I wanted to learn PBR (Physically-Based Rendering) workflow and made a scene with it. Marmoset Toolbag 2 was the right engine for this. Total tris count is 114k and the scene runned 60fps with AMD 7990 GPU.
This work has been featured in 3dtotal.com gallery, CG Choice Gallery, InCG Magazine, 3D Artist Magazine and in many other cg-related site. I also wrote couple of articles about this into various magazines. Scene was also playable in the GDC 2014 expo at the Marmoset booth. Making of can be found here http://kimmokaunela.esy.es/lfi02.html