Hall of Horrors

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I'll try to show some things not to do here!

Chief among them: setting up trackers on uniform surfaces, so that the pattern can move without any change in the image. For example, tracking a monitor with a green card on it with a tracker that contains only the green card, nothing around it... the planar tracker can shrink down infinitely small and it is still perfectly green! Trackers need to include some contrasting surroundings.

Patterns should have large-scale features. For example, for monitor inserts having some tiny dots is not a good idea... any slight mismatch between the reference and the potential match, and the dots don't overlap at all. When that happens, there is nothing to be learned by repositioning the potential match—nothing changes because you are comparing background to background and dot to background. High Detail mode is a must.

Planar trackers where the interior is not coplanar with the border, for example, a fancy doorway where the door is recessed several feet from the frame. Because the interior isn't coplanar, it must be masked out, and only the coplanar border tracked.

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