Harry Potter Visual Effects. Harry Potter Producer Cringes at Films Early Visual Effects British film producer David Heyman says the visual effects in the early Harry Potter films make him shudder. The worked for 6 months previsualling the effects starting in September 2005.

While the duel only lasts a minute or so it remains firmly engrained in the memory of fans thanks to some terrific camera work dazzling visual effects and spectacular colors. Double Negative was responsible for sequences in the Room of Requirement Forbidden Forest Hall of Prophecies and the Death Chamber. ILM has just announced it is.
The Basilisk that lives deep below Hogwarts in Harry Potter and the Chamber of Secrets was created through a mixture of Practical and Visual effects.
Miniature Hogwarts Harry Potter and the Sorcerers Stone 2001 In nearly every one of the Harry Potter films exterior views of the iconic Hogwarts School of Witchcraft and Wizardry were. With each film the technology creativity and budget for effects increased garnering multiple BAFTA and Oscar nominations -- including a BAFTA win in 2012 for Harry Potter and the Deathly Hallows. A full-size practical Basilisk mouth was created by the Creature Shop to fight against in the final battle scene measuring up at 30ft long with jaws 3ft deep. The visual effects were significantly upgraded for Harry Potter and the Order of the Phoenix culminating in what is arguably the greatest wizarding duel in the entire series.