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Tripod/Indirectly Solving Mode
With two cameras, nodal tripod shots are less an issue because distances and 3- D coordinates can be determined if there are enough nearby features. However, you may encounter shots that are nodal by virtue of not having anything nearby; call them "all-far" shots. For example, consider a camera on the top of a mountain, which must be attacked by CG birds. With no nearby features, the shot will be nodal, and there will be no way to determine the inter-ocular distance. Any inter-ocular distance can be used, with no way to tell if it is right or wrong.
Like a (monocular) tripod shot, no 3-D solve is possible, only what amounts to two linked tripod solves.
Use the Tripod/Indirectly setup (tripod mode on dominant camera, indirectly on secondary). When refining, use Refine Tripod mode for both cameras.
On the stereo geometry panel (see below), you should set up your best estimate of the inter-ocular distance, either from on-set measurements or from other shots. You can animate it if you have the information to do so. Set the Direction and Elevation numbers to zero, or known values from other shots.
SynthEyes will solve the shot to produce two synchronized tripod solves.
Then, it will compute adjusted camera paths, based on the interocular distance and the pointing direction of the camera, as if the camera had been on a tripod. These will typically be small arc-like paths. If you need to later adjust the inter-ocular distance, Refine (Tripod) the shot to have the paths recalculated.
As a result, you will have two matching camera paths so that you can add CG effects that come close to the camera. Since SynthEyes has regenerated the camera paths at a correct inter-ocular distance, even though all the tracked features are far, you will still be able to add effects nearby and have them come out OK.
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