On set the team spent a full day measuring and photographing this set. The lighting would have to match perfectly and the staircase build needed to accommodate close up viewing. In one shot you might see a large area of the practical set behind an actor, just before cutting to a close up of the same actor with a green screen behind him. The team would then have to rotoscope the actors and change lighting set ups.
The production was often shooting right off the set and into the rafters, because the set was so large that they couldn’t put a green screen above it when the action approached the top of the stairs although the actors might be running back up into the lighting rigs.
From these, Cinesite developed the looks and produced basic renders to submit for approval. They had some blueprints showing that it needed to essentially extend into infinity. The principle photography for ‘Deathly Hallows Part 2’ was done back to back with ‘Part 1’, and because the sequences had already been shot when the team started, the practical set had been destroyed and built up again.
At the time we re-built it we still didn’t know the level of destruction, type of lighting or the size of the environment, so we tried to be prepared.” “We took a pretty standard approach, collected all textures, took a Lidar scan and total station survey and built a module that we could re-use and replicate. Although large, it actually only represented a small section of the staircase. The set piece extended about 1 and 1/2 stories, each way, and appeared dressed according to the sequence. This staircase has appeared in the earlier films, sometimes with rotating steps, but in this film it becomes much larger, extending into the distance within a very large environment.” CG digital supervisor Holger Voss said, “It was developed from a big set piece built at Pinewood Studios. It was built as a very large CG asset that could appear in many scenes through out the film at different times of day, and also be destroyed. Cinesite built an integral part of the interior of Hogwarts, the great marble staircase where a large portion of the action, battles in particular, takes place.
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