REAL FIRE
“The producers’ biggest concern was that CG fire didn’t look real,” outlines Mavericks Visual Effects Supervisor Brendan Taylor. “So, my pitch to them was, ‘I think what you should do is design the scene in a series of lock-offs. We’ll shoot the actors on the set with interactive fire light on them, and then we’ll come back, set the camera position up again on the stage, and then burn it down.’ Because all the interior shots were set on stages, we were actually able to burn it down, because we were never going back there.”
In terms of the visual effects work, that would mean Mavericks would rotoscope the actors off the first-pass set footage and put them into the burning set. Taylor says they did consider shooting the actors against blue or greenscreen but decided against it.
“My concern with bluescreen,” notes Taylor, “was getting the interactive light far enough away from them, because the fire was about 15 to 20 feet away, and we had some flame bars set up there. We couldn’t really position a bluescreen in such a way that the interactive fire was not flickering all over the screen. We weren’t too concerned about doing roto. And, a lot of the time you can really tell when it’s a bluescreen, and I felt like having the interactive fire at the distance that the real fire was would help for the believability.”
In any case, to convince production that the desired approach, i.e., shooting one pass with the actors and interactive fire light, and then another pass burning the set down – could work, a test with stunt doubles was arranged. “We lit the wall next to them on fire, just to see what kind of interactive light we would need, how close they could get and how much smoke there was going to be,” says Taylor. “Because we were shooting the foreground element with the people beforehand, we really wanted to make sure we knew what we were doing.”
Those tests proved successful, and it also resulted in a ‘bible’ for each shot being prepared that outlined what was needed from special effects, stunts, production and from visual effects. “It’s amazing how fast fire can take hold,” says Taylor. “It’s like, nothing happens, nothing happens and then woof! They were really smart – they built flame bars into the wall, so they would just have to light those and put accelerant onto the walls, but then a second later, it’s done.”
The fire elements were filmed at high speed on interiors, and that meant after each take the stage needed to be vented. It also meant that burns were limited over a two-day shoot period. Artists at Mavericks then combined the elements, taking the background fire plate, significantly blurring it and then, describes Taylor, “softly screening it over the top of the foreground to give it all a little bit more of an orange feel. It was a very subtle thing, but it worked so well to just integrate the foreground in there.”