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This is a VFX test of a fake ski train.
I filmed all 4 people hit the jump separately and then combined the shots afterwards. Despite not touching the camera it moved very slightly which is visible around each skier and could be reduced by rotoscoping them more precisely. However that would take a lot of time so I will wait until later in the season when a lot of people are doing bigger tricks.
I think this effect would look much cooler if there were more people.