Ohhh

 

Firefly= pc version of Tempest: old engine of Pixel 3d, 2002.

Firefly: Hybride render, scanline+ raytrace

http://www.pixels.net/

New engine: Pixels 3d 5.5

http://www.pixels.net/products/  

Maxwell render, luxrender and other= PATH TRACER (raytracing), + caustic photon mapping

Full photon= SPPM for Stochastic Progressive Photon Mapping