Have a look at this impressive extensive VFX Breakdown by Weta for The Hobbit Desolation of Smaug.

The hobbit VFX breakdown

The hobbit VFX breakdown

The hobbit VFX breakdown

The hobbit VFX breakdown

The hobbit VFX breakdown

The hobbit VFX breakdown

The hobbit VFX breakdown

The hobbit VFX breakdown

The hobbit VFX breakdown

The hobbit VFX breakdown

The hobbit VFX breakdown

The hobbit VFX breakdown