BCC Lens Flare 3D MT

I’ve got a camera guy’s reflection in a car side mirror, and I’m trying to put a small lens flare on the mirror to obscure him.

The lens flare looks good, and track-on-the-fly seems to have locked onto the mirror, but when I deselect the checkbox the flare remains stationary and doesn’t track the mirror.

What am I missing?

In the Motion Tracker group make sure the Apply menu is set to Light Source. This menu is how you control which point picker receives the tracking data. In Lens Flare 3D there is only one choice (other than None), but in other filters this lets you pick between multiple potential point controls for applying the track.

That did it!

Thanks, jclement!