Thea Render for SketchUp
Thea Render is a physically-based photorealistic renderer of high quality.
Thea Render for SketchUp

Thea for SketchUp is a combination of powerful rendering engines of Thea with the simplicity of SketchUp. Having biased, unbiased and interactive render modes (including GPU support) at your fingertips, inside SketchUp, is an joyful experience. The plugin lets you enrich your models with highly detailed three dimensional content, breaking old limitations related to handled model complexity.

Find more info here: http://www.thearender.com/sketchup