That would require one REALLY high ceiling. Plus the framerate of the camera for pyro wouldn't be ideal for the movement of debris. Explosions were frequently shot at 120 to 300 fps, and at 32 feet per second it would take 3840 to 9600 frames for the debris to travel 32 feet towards the camera. Sloooooow motion. Better to shoot the debris separately.One effect I though about would be to have a model explode, but far above it and in shadow, a lot of large debris--larger than the FX model.
Explode the model--drop the debris towards the camera.
That would require one REALLY high ceiling. Plus the framerate of the camera for pyro wouldn't be ideal for the movement of debris. Explosions were frequently shot at 120 to 300 fps, and at 32 feet per second it would take 3840 to 9600 frames for the debris to travel 32 feet towards the camera. Sloooooow motion. Better to shoot the debris separately.One effect I though about would be to have a model explode, but far above it and in shadow, a lot of large debris--larger than the FX model.
Explode the model--drop the debris towards the camera.
One of the fastest frame rates ever used at ILM was for the film Star Trek II: The Wrath of Khan. Near the end of the film an incredible explosion is to take place as a planet called Genesis is formed. Jim Veilleux, co-supervisor of effects on this project, chose a special rotating prism camera to film a phosphorous explosion.
While a standard motion picture camera holds the film momentarily immobile during the exposure, camera speeds greater than 250 frames per second test the capacity of even the best high speed cameras. With a rotating prism camera, a prism bends the image to follow the film as it races past the lens. The film is never held immobile: therefore very high shutter speeds are possible.
The explosives for the Star Trek II shot were placed high above the floor of the Cow Palace in San Francisco. Black material was attached to the ceiling to provide the appropriate black space background, while the camera looked straight up at the falling phosphorous material. The special camera ran at 2,500 frames per second. In real time it took one second to occur; on film it became a one-minute, forty-four-second event. Since the image from the rotating prism camera was not rock steady, each frame was repositioned and rephotographed in order to eliminate the shaky quality of the picture. The resultant effect was spectacular.
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