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Combining Regular and GeoH Tracking
It can be useful to combine regular and GeoH tracking when you need to add secondary animation to a moving object (ie one solved from the Solver panel based on 2D automatic or supervised trackers). You might do this if you don't have a good 3D model for the object, if the tracking is very difficult and 2D trackers are a better choice, or if you need to obtain a camera field of view as a result of the solve.
You can add the GeoH tracking after completing the regular solve. You'll need to construct at least a small local model of the object, in the area where you want to do the secondary tracking. (Alternate plan: see the following section, GeoH Track with 2D Trackers.)
Your local model might be constructed by tesselating your existing 2D trackers, using the mesh building capabilities of the perspective view (see Building Meshes in the
SynthEyes User Manual). Or you can chop up a primitive mesh to get something similar, or even import something from your modeling package. Anything that fits.
Once you've done that, you can reparent that mesh to the regular moving object, build GeoH children on top of it, and track them as usual; there's no difference due to there being a moving object at the root of the tree.
Note: While GeoH objects can have a moving or GeoH object as a parent, moving objects don't have any parents at all, so moving objects can appear only as a root object.
If you later need to re-solve the scene, so that the moving object, camera path, or field of view will change, you'll need to retrack the GeoH object's to accommodate those changes. Retracking should be simple and reliable, especially if the GeoH tracking was done in only one tracking direction. If tracking proceeded forward and back from a frame in the middle, you may have to repeat that.
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