After Solving | Boris FX

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‌After Solving

Though having a solution might seem to be the end of the process, in fact, it’s only the … middle. Here’s a quick preview of things to do after solving, which will be discussed in more detail in further sections.

 Check the overall errors

 Check unsolved and converted-to-far trackers (which are selected after solving, as long as the preference is set)

 Look for spikes in tracker errors and the camera or object path

 Examine the 3-D tracker positioning to ensure it corresponds to the cinematic reality.

 Add, modify, and delete trackers to improve the solution.

 Add or modify the coordinate system alignment

 Add and track additional moving objects in the shot

 Insert 3-D primitives into the scene for checking or later use

 Determine position or direction of lights

 Convert computed tracker positions into meshes

 Export to your animation or compositing package.

You can also compare lens field of view/focal length information to values recorded during the shoot. However, the lens field of view and focal length information displayed corresponds to the undistorted image resulting from the solve, or produced by the image preprocessor, and consequently don’t correspond to the original distorted imagery. The FOV/FL are what will be used for downstream applications. So….

IMPORTANT: To compare the focal length to an on-set value, you must run the Lens/True Field of View script to generate an apple-to-apples value for comparison!

Reminder: Focal lengths are only half a number and depend critically on your having entered the exact sensor size for the pixels in the images being processed. Cameras usually crop their sensors to generate different resolutions, so the sensor size is different for each!

Once you have an initial camera solution, you can approximately solve additional trackers as you track them, using Zero-Weighted Trackers (ZWTs).

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