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I've been trying to motion track a footage that I can't wrap my head around.

It's a handheld shot that slowly tilts upwards - towards the sky. I have plenty of trackers until the sky is revealed and then I have nothing to track. So half of my footage is devoid of tracking markers.

3D objects I place inside the footage stay grounded until the sky is revealed and they just slip out of their place.

How can I solve this ? Thanks in advance !!!

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  • $\begingroup$ I think you’ll probably need to manually animate the camera during those sections where you don’t have enough tracking points. You can do this either by manually filling in the tracks by moving the trackers manually or by disabling the camera tracking constraint for that section and keyframing the camera motion. It will be a challenge getting the transition suitably smooth but this will depend on your actual footage. $\endgroup$
    – Rich Sedman
    Commented Dec 24, 2021 at 16:04
  • $\begingroup$ Thanks Rich ! Does this mean that I have to manually place a marker and then reposition the centre frame by frame ? Do this for several markers positioned in the sky ? $\endgroup$
    – walkingcure
    Commented Dec 26, 2021 at 12:25
  • $\begingroup$ Yes - manually faking the track in that way is one way of doing it. Another way would be to keyframe the camera for that section - and use the constraint Influence to control when the camera is controlled by the track and when it’s controlled by your keyframes. $\endgroup$
    – Rich Sedman
    Commented Dec 26, 2021 at 23:36
  • $\begingroup$ I think I understand what you're saying - at least conceptually. But I'm very new to all this so I have no clue as to how I would approach this. Do you know of any tutorials that show how it's done ? $\endgroup$
    – walkingcure
    Commented Dec 27, 2021 at 12:31
  • $\begingroup$ Hey Rich, After a lot of guesswork I finally managed to disable the Camera constraint by keyframing it's influence. However, when I bring the influence down to 0, the Origin and my 3D model jump out of place. What do I do know ? On a positive note, I also managed to animate the camera that closely resembles the original shot. $\endgroup$
    – walkingcure
    Commented Jan 15, 2022 at 6:48

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I think that when you have no trackers in the sky, blender has no information to determin the right position. You might have to reshoot the footage with a wider shot where the trackers stay visible and cut to the sky in post production.

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