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Cuarón's initial idea for maintaining continuity during the roadside ambush scene was dismissed by production experts as an "impossible shot to do". Fresh from the visual effects-laden Harry Potter and the Prisoner of Azkaban, Cuarón suggested using computer-generated imagery to film the scene. Lubezki refused to allow it, reminding the director that they had intended to make a film akin to a "raw documentary". Instead, a special camera rig invented by Gary Thieltges of Doggicam Systems was employed, allowing Cuarón to develop the scene as one extended shot.[14][63] A vehicle was modified to enable seats to tilt and lower actors out of the way of the camera, and the windshield was designed to tilt out of the way to allow camera movement in and out through the front windscreen. A crew of four, including the director of photography and camera operator, rode on the roof.[64]

However, the commonly reported statement that the action scenes are continuous shots[65] is not entirely true. Visual effects supervisor Frazer Churchill explains that the effects team had to "combine several takes to create impossibly long shots", where their job was to "create the illusion of a continuous camera move." Once the team was able to create a "seamless blend", they would move on to the next shot. These techniques were important for three continuous shots: the coffee shop explosion in the opening shot, the car ambush, and the battlefield scene. The coffee shop scene was composed of "two different takes shot over two consecutive days"; the car ambush was shot in "six sections and at four different locations over one week and required five seamless digital transitions"; and the battlefield scene "was captured in five separate takes over two locations". Churchill and the Double Negative team created over 160 of these types of effects for the film.[66] In an interview with Variety, Cuarón acknowledged this nature of the "single-shot" action sequences: "Maybe I'm spilling a big secret, but sometimes it's more than what it looks like. The important thing is how you blend everything and how you keep the perception of a fluid choreography through all of these different pieces."[9]

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Originally posted by redstone:
I loved the opening to Gravity as well. I really love the idea and execution of the tracking shots. It takes an amazing amount of planning and strategy to pull it off. I watched a documentary on the rig that they built to film the ambush scene, it is a feat of engineering.

I think this is the same one, but low res I could not find the original.



Article on the Gravity Opening sequence.

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