Earthquake SFX Challenge - Compositing

The final composite file contains 14 seperate layers. These layers are briefly described below. An image of a typical frame is shown for each one.
Clicking on the images takes you to higher resolution version.

The next page shows how these elements are combined together.

Note that the images are not all taken from the same frame of the sequence because some images would then be blank, as not all elements have anything interesting in them for the entire duration of the clip. Frames were chosen to try to best illustrate what each layer is for. Some of the thumbnail images are enlargements of part of the frame, when the frame is nearly empty (e.g. the car and van).

1. Subsurface with main lighting casting deep shadow into chasm. No tarmac.


2. Subsurface with fill light, lightens up overall chasm. No tarmac.


These two layers allow the lighting of the chasm to be tweaked.


3. Single frame clean plate of undamaged road surface.


(This is used to initially cover up textured damage on areas that the crack hasn't reached yet).


4. Tarmac surface with visible geometry based fragmentation.


5. Tarmac surface which splits, but has no fragmentation on the surface.


6. Mask which blends between '4' and '5' around the outer edges of the fragments.


7. Texture based 'damage' to inner edge of tarmac fragments.


These are used to provide breakup of the surface of the road complete with textured damage of the inner edges of the fragments. The blend here is to blend between images with different geometry to increase the apparent overall complexity of the crack damage, particularly to break up some of the obvious straight lines.


8. Animated mask to selectively replace parts of '3' with '4+5+6+7' as crack progresses.


This reveals the damage as the crack progresses.


9. CG Car element, with recieved lighting and shadows cast on it.


10. Shadow from car onto road surface.


These two elements are rendered seperately for maximum flexibility in getting colour/lighting match.


11. Section of clean plate to replace parts of right hand side of road.


This provides a chunk of the image that hasn't been replicated in CG.


12. Original footage, masked to show only the left hand side of the road.


This footage has been warped to match the deformation of the road surface as the crack expands, but is otherwise unmodified.
This provides traffic on the left hand side of the road.

13. Van on right-hand side of road, masked out from original footage, and repositioned in time.


14. Car on right-hand side of road, masked out from original footage, and repositioned in time.


These provide some traffic on the right hand side of the road, in addition to the CG car.


The next page shows how these elements are combined together.