What is the importance of the point size of track?

I'm doing the follow-up of the camera. I have two very similar scenes and in one of them the track points are much smaller.

I assumed it was supposed to represent the distance from the camera, but now I'm not sure.

You are right. If the point of the track sizes (and relative triangulation targets) seem to fill the screen enough 'also' without a lot of overlap and without being absolutely tiny, it means you've got a good track and that the camera will be placed well enough in terms of focal length. When the track points are tiny or almost impossible to see, your camera will be placed ELSEWHERE far from there and you will probably end upward with a lot of focal distortion in your scene resulting. It is really no great way to get the AE to give you optimal results other than choosing the right type of camera movement and begins with images of good quality with a lot of visible depth and a good amount of movement. You can try to delete points to 'improve' on a track, but rarely have I found this method to produce better tracks. If you do a lot of follow-up camera, I strongly suggest you script "World Transform", which corrects many of the investments of a track weird camera. It allows you to 'fit' your entire scene, so if your track give a camera to Y =-20 000, you can scale the computer down by any percentage you need to get him back in a reasonable range of 1 000 to 2 000. It will make all the necessary corrections to ensure that your device is not set to zoom 15 000 pixels as well.  You can also offset your comp so that your null values or the fire is properly centered and easy to work in different orthogonal views. I find it a valuable tool when you use the tracker to the camera.

Please note: once you use World Transform to correct your scene, you are no longer able to go back and set null values or the lights of your track of original film, since the positional link has been altered, so keep that in mind.

Tags: After Effects

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