As seen in the previous post (link for which is below this paragraph), the car has been roto'd, merged and tracked in two places, but when the car is supposed to go out of shot, the car continues to be dragged down, so this problem needs to be rectified.
http://www.darthspockvfx.blogspot.co.uk/2012/11/vfx1-dd1410-car-pan-shot-rotoing.html
The car being dragged down with the shot problem can be solved easily with a third tracker. Read in the new tracker, along with a new transform) and find a suitable tracking point (in this case, a darker section of the road).
Place the new tracker and transform on the node tree, on the same branches as the corresponding transforms and trackers.
Make sure on the timeline, the tracker is set to start tracking where the previous tracker ended (make sure they do not overlap).
Now track the footage to the end of the footage.
Next, copy the tracking information across to the transform node as before, and re-position the car if needed.
If this should create a green line between the tracker and the transform nodes, just like with the previous tracker and transforms.
This should fix the tracking problem. Below is the footage from the last blog post showing the problem with the tracking:
And here is the footage including the new tracker and transform nodes (apologies for the footage being slow, Nuke was being very slow when this was recorded, hence why the footage was made shorter too):
Apart from a few bits of fine tuning, this piece is done. The next step is sorting out the shadow, it clearly stands out in the footage. To deal with this, the same rotopaint node that was used on the windows, can be used to sort out the shadow (as well as using the feather tool on the roto node.
Since in the previous post not a lot of detail was given on the rotopaint node and how it works, the next blog post will center around the rotopaint node.
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