If your interested in the technology that makes this somehow possible in realtime:
* HDR rendering.
* Complex HDR post processing.
* Dynamic soft shadows for all objects.
* Water shader with HDR refraction, HDR reflection, depth fog and Gerstner wave functions.
* Heterogeneous fog.
* Atmospheric light scattering.
* Realistic sky model with cloud blending.
* Strauss lighting model for most materials.
* Subsurface scattering shader for some objects (not visible in the shot).
* Texture & normal map sizes: 1024 x 1024 to 2048 x 2048.
* Approximately 5.4 million triangles and 8.8 million vertices.
Got a permanent feather in my cap;
Got a stretch to my stride;
a stroll to my step;
Got a stretch to my stride;
a stroll to my step;