A few years back I taught a module on Visual Effects for filmmaking degree students at the SAE Institute in north London. Rather than getting into the nitty gritty of how to actually do VFX, it focused instead on how directors and producers should approach and plan for them.
Here is one of the examples I gave, using a shot from my 2005 feature Soul Searcher. Joe Fallow (Ray Bullock Jnr.) sprints down the platform of Hereford station as the Hades Express departs, bearing away the villain of the piece and the kidnapped love interest.
Finished shot from Soul Searcher
The train was a 1:18 scale miniature and was dropped into the live action plate by means of a simple, static matte drawn in Photoshop – essentially a splitscreen effect.
But what if I, as director, had chosen a different camera angle?
Alternate angle 1
To achieve this version, the model train would have needed to have been shot against a green screen to make it appear in front of Joe and the platform. This would have complicated shooting the miniature slightly, as lighting for a green screen can be quite time-consuming.
Alternate angle 2
Here we have the opposite; now Joe is in the foreground, so he’s the one that needs to be shot against a green screen. Since he and the station are full size, the green screen would need to be much bigger and would require much more light. And remember we’re now talking about an impact on the main unit’s time on a location, rather than a small model unit in a studio, so the cost implications are magnified.
Alternate angle 3
Finally, what if I’d gone for a camera move? Now we’re into motion control rigs, to record the camera’s movement on location and applied a scaled-down version of that same move to the camera shooting the miniature. Either that or the live action plate has to be 3D-tracked in post-production, and that tracking data fed into the motion control rig that shoots the miniature. More time, more people, more equipment, more money.
This is the first step in planning for VFX: understanding how your choice of shots influences the techniques required to achieve them and therefore impacts on the schedule and the budget. Stay tuned for more on this topic, and remember you can watch Soul Searcher in full for free at neiloseman.com/soulsearcher