Reconstructor

Camera position reconstructor for Blender, using correlated motion tracker markers across different movie clips to solve camera positions

General Plan/Workflow

Create motion tracks from clips with matching focal lengths.
- Individual images within clips must have the same focal length
- Clips should be at least partially track-solved (if correspondences found) to derive optical center or distortion params.
ADDON: Create cameras for each clip.
- Alternately, can link clips to existing cameras.
- Define rough axial position wrt target object (i.e. front, above, left) to prime/constrain solve
- Crux: cameras correlate with clips.
ADDON: Create empties for each tracked element.
- https://blender.stackexchange.com/questions/248078/how-can-i-get-the-list-of-all-tracking-markers-using-python-command
ADDON: Associate correlated empties from different clips, so that their "solves" can converge
ADDON: Solve -> Bundle adjust linked empties and cameras to minimize distance between linked empties
- Beware converging the cameras toward 0
RESULT: Cameras and empties positioned in best approximation of analogous 3D positions, with minimized error

For mathematical details underpinning the concept, see MATH.md.