The first was the explosion, I knew I had to use Sony Vegas (which I have at home) to create it the way I wanted to, and I knew I had to find the moment in which our character is off camera.
I then got the earliest frame I could so I could maximise how long I could get the explosion to last, once I had done this, I knew I had to find a green screen explosion and downloaded it from YouTube.
This video provided a lot of explosions so I had quite a choice, I chose one and cut it out and imported it to Sony Vegas (with the video clip).
It then started getting complicated, I added the explosion to the layer above the video clip, and chose the effect FX "Sony Chroma Keyer" this is the Sony Vegas equivalent of a green screen effect.
Once this was done I knew I had to cut out the bridge from the explosion layer, and being fairly inexperienced with Sony Vegas I knew how I wanted to do it, but not how to do it precisely, but I had to use to crop tool (which is more advanced than the iMovie crop tool, and allowed me to crop specific areas) and I knew it would work because it was on a tripod and still.
So to crop it, I had to crop along the explosion, and give an educated guess as to where the bridge would be in relation to the explosion, looking back I realised I could have cropped out the bridge layer and saved the cropping shape, so it took several attempts to get something I liked, and was accurate.
The helicopter was easier to produce, first we had to film the field, with an idea of the height we had to film it at to look accurate, although we knew it would look fine regardless.
Once we had the field, we also had to download a helicopter green screen, one we had seen earlier whilst browsing YouTube casually, and we thought it would be good in our film for a short action clip.
Then all we had to do was import the two clips into iMovie (Not HD) and drag the green screen clip on to the field clip, and select Green Screen and it produced the final product:
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