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Here’s the overall process for using the curve and flex system to determine a 3-D curve. The quick synopsis is that we will get the 2-D curves positioned exactly on each frame throughout the shot, then run a 3-D solving stage. Note that the ordering of the steps can be changed around a bit, and additional wrinkles added, once you know what you are doing — this is the simplest and easiest to explain.
1. Open the shot in SynthEyes
2. Obtain a 3-D camera solution, using automatic or supervised tracking
3. At the beginning of the shot, create a (2-D) curve corresponding to the flex-to- be.
4. “Rough-in” the path of the curve, with control-point animation keys throughout the shot. There is a tool that can help do this, using the existing point trackers.
5. Tune the curve to precisely match the underlying edges (manual or automatic).
6. Draw a new flex in an approximate location. Assign the curve to it.
7. Configure the handling of the ends of the flex.
8. Solve the flex
9. Export the flex or convert it to a series of trackers.
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