3D camera tracker creates enormous 3D space

Question

Hi there,I got some greenscreen footage with a mobile camera and am supposed to key and track it.There are quite a lot of tracking marker both in the front as well as on the back of the greenscreen.When I use the 3D camera tracker and after analysis e.g. create a text + camera, The camera has a movement of about 10000px, where it moved like maybe 3 meters and the text that I pinned to the background is around 100000px away, where it have been around 5-10 meters on the set.If I understand it right I would need to put my 3D set (a very simple one, I created in AE) to the same Z of 100000px. That's quite unconvenient.How can I fix that scaling?Thanks a lot for your help!Martin

Roei Tzoref · Accepted Answer

Try this:1. Add a 3d null2. Parent the camera to the null3. Scale the null to your liking. Maybe 0.1% 4. Delete the null

Mylenium · Answer

How can I fix that scaling?Not really. Unfortunately the AE tracker can't be calibrated and nay solution it calculates is arbitrary and bears no relation to any realworld measurements. Sometimes the resulting scene is too big, sometimes too small, sometimes just right. Of course you can multiply the keyframe values by applying an expression like value*0.1 or similar, but you still have to put up with figuring out the correct camera settings to compensate for the scaling, which actually is the tricky part.Mylenium

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