Jetset Cine
Jetset Cine Tracking Quality
This clip is a good reference for the tracking quality that we generally see from a Jetset Cine clip processed without additional tracking refinement.
This clip is a good reference for the tracking quality that we generally see from a Jetset Cine clip processed without additional tracking refinement. There is enough detail in the practical floor for Jetset to get a decent tracking lock.
This video shows the tracking data and scan data imported into Nuke with our Autoshot Nuke importer and rendered.
As you can see, it’s reasonably well lined up overall, but has small jitters in the track that don’t work for a shot with ground contact. For shots like this, we recommend refining the track using our SynthEyes or GeoTracker tracking refinement workflow (tutorial coming very soon.)
The Distance to Floor represents how far a ray of light would travel from a visible spot on the floor to the camera lens. As you can see, very small angular misalignments in the tracking sensor result in considerable tracking misalignments as measured on the actual ground.
Ground Contact Math
In truth, most real time tracking systems will have difficulties getting ground contact tracking accurate to sub-pixel levels, for simple reasons of optics. This chart helps explain why, using the equation: Ground Contact Misalignment = Distance * tan(Sensor Misalignment Angle)Calculations chart
| Sensor Misalignment Angle (deg) | Distance to Floor (cm) | Ground Misalignment (cm) |
|---|---|---|
| 0.1 | 200 | 0.35 |
| 0.2 | 300 | 1.05 |
| 0.3 | 400 | 2.09 |
| 0.4 | 500 | 3.49 |
| 0.5 | 600 | 5.24 |