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According to the wiki:

Bundles makes sense after solving the movie clip, and it works in the following way: the solved position of each track gets projected back to the movie clip and displayed as a small point. The color of the point depends on the distance between the projected coordinate and the original coordinate: if they are close enough, the point is green, otherwise it'll be red. This helps to find tracks which weren't solved nicely and need to be tweaked.

I am solving the scene and see nothing similar to what's described:

enter image description here

Points are displayed not as points, but as squares, blue means before in time, red means after in time. Yellow or white means selected point.

Where is something green?

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    $\begingroup$ I might be mis-interpreting something here, but those look green and red to me.. Here's an example image. $\endgroup$ – gandalf3 Jul 1 '14 at 19:43
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    $\begingroup$ @gandalf3 yes the boxes will change color too according to the reprojection error. But I believe the OP is asking about the 3D markers, those show up as colored dots showing the actual location of the solved tracker. $\endgroup$ – cegaton Jul 1 '14 at 20:00
  • $\begingroup$ @gandalf3 but this is different. red rectangles mean that tracks are exist on other frames, not on current frame; and dirty green rectangles denote tracks on current frame; no any variation according to description $\endgroup$ – Dims Jul 2 '14 at 14:04
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Those red and green colored points are available only after you have successfully solved the scene.

To make them visible, enable 3D Markers on the Marker Display Tab.

enter image description here

The dots show the difference between the tracker and where blender is actually laying the points in 3D space. It is a visual reference to help you identify problems and further refine your track to get a better camera solve. The colors reflect to the "reprojection error" If the rerpojected points are close to the original tracker they will show green, otherwise they will be red.

Here you can see how the tracked points are not being reprojected correctly and show as red dots away from where the tracker was. enter image description here

Sometimes you can make the reprojected points fall closer to the original trackers by moving the optical center on the camera presets . enter image description here

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