Any plans to add 2D feature tracks?

[ChoiiYill]

FYI: The --colmap output does not contain information about the 2D feature tracks, since I assumed most people just wanted the camera poses and maybe a sparse reconstruction. If this would be helpful for people, I could add it.

Originally posted by @lahavlipson in #68

Can you tell me how to add 2D feature tracks? Jusk like colmap format. So that I can convert the trajectories to GPS coordinates for further comparison.

colmap format

point3D.txt
# 3D point list with one line of data per point:
#   POINT3D_ID, X, Y, Z, R, G, B, ERROR, TRACK[] as (IMAGE_ID, POINT2D_IDX)
# Number of points: 28324, mean track length: 5.4591512498234716
25151 3.7663412384652464 -49.827756393035543 37.854991343288432 51 55 63 1.3444477078263326 37 124 12 938 15 2958 14 823 38 2435

images.txt
# Image list with two lines of data per image:
#   IMAGE_ID, QW, QX, QY, QZ, TX, TY, TZ, CAMERA_ID, NAME
#   POINTS2D[] as (X, Y, POINT3D_ID)
# Number of images: 64, mean observations per image: 2416.015625
37 0.99748820721315179 -0.021073795385857144 -0.013866280850002693 -0.06618835149870636 -10.057144160638222 35.489330593117224 0.16388883863087594 1 img_0036.jpg
891.9544677734375 138.04527282714844 25151 
·····

Thanks.