The sequel Crank 2: High Voltage is already in production with returning star Jason Statham and the same writer-director duo of Mark Neveldine and Brian Taylor. And they are already planning the third film for 3D.
In Crank 2 the filmmakers are planning to update and enhance the classic 'bullet time' effect that begin with The Matrix and now is used in car commercials. This is a pseudo-3D looking camera move that uses many still cameras, green screen and lots of computer rendering time.
Mark Neveldine explained, "We're pushing the limits. . .We're going to be creating a moving bullet[-time] camera that has never been done before. We're putting about 15 cameras onto a piece of speed rail, all these super lightweight cameras that I'll be holding on rollerblades flying around people. So you'll have that image that you've seen in The Matrix, where they stop motion and the cameras spin around, except for the fact that our cameras can spin around and move while the actor moves."
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OK, I know this is only slightly connected to 3D, but we happen to be huge Jason Statham fans.