Hi guys in this lecture you are going to learn about the track point.
What are these squares that you see here and what is this place in the middle.
Also we are going to position the attack point on a certain element or certain visual that we want to
talk with in the video.
And in the next lecture we are going to analyze and talk and then we will attach a target just from
overdye.
First there is something important I need to bring to your attention.
Let's look at that.
Here we have trackball into one.
Now every time you click on the track motion a rocket is created within the rocket you'll have a track
point one.
So that is there is no difference between the two track points.
If you click again by mistake OK now you have so many Thakurs.
Please if this is the case select all the trackers that you don't need keep only tracker 1 and press
delete to delete all the ruckus except that point to what I would 12. not selected for Antoine and you
going to that Antoine was in your pun.
Let's understand a bit about the trackball and if you zoom in I'm using the mouse scroll here is.
All of this is the trackball one is a big square which is the search region and there is a smaller square
which is the featured region and there is a cross there that is called the attachment.
The big square here is the situation.
This is where aftereffect is gonna search to determine the position of the featured region.
The smaller square within the smaller square you are going to look for a search in demonology.
If you come to options here you will notice that it's a tracker one and there are the challenges here.
You could look for a color AGP for luminance or saturation livingness is how bright or is the pixel
is the best to work with.
But I also see a situation in some cases can be very useful.
So it's going to look within the feature region the smaller square for the luminance and then is going
to position the attach point and keyframe it.
So this is the whole concept within the search engine.
Place the feature region and position the attach point and keyframe it.
If you come to the land over here there is the Fisher Center the Fisher Center is the center of the
whole point.
If you are in.
If I move it very slowly it is moving the whole track.
And then there is the feature size.
This is the size of the feature region.
You see you can make it bigger or smaller.
It is not good at all to make it bigger than the search region.
Doesn't make sense also.
Also you can come over here click on the corners and make it the size that you want from here.
Is much better because you make it bigger and that's what's happening.
The search engine also is getting bigger.
That's a cool way also to work.
I will undo all this and then you have the search sites.
This is the size of the search region.
Of course you can change the values from here but much more practical to click on one corner and start
moving it around to the site for your search region and you have the attach point.
This is the position of the attached point not is now it's in the middle of the composition you have
over here the confidence higher values means that either X is very confident in his analysis for the
track point lower values like 2 or 3 percent.
It means that that point is lost completely.
You know we can see what it is.
So the curve in this is an indication of how good is your track point in terms of the feature size and
the search region.
Now the next step is to position the track for what you wanted to track.
So I would zoom out here and I want to track this little guy over here.
You can click anywhere within the track point.
And when the mouse pointer looked like he moved pointer you can click and drag and position it whenever
you want.
Notice how he's tried to zoom in because actually we usually track very small points.
Now I will use our option on the Mac and zoom in spacebar to position.
First of all you focus on the search engine.
Make sure the search engine is big enough to always include what ever you want to track.
Then you focus on the feature region.
This is what you want to track and just move it like this.
I prefer to do that and re adjust the search engine.
That's what I usually do.
Yet you can start resizing the feature region here or the small square.
It's important that within your search engine there is always the element that you are trying to track
and in the feature region there is something that is you know different from the background the limit
is higher than the background.
So if you call the guy the foreground It has higher luminance than the bagong.
So for me I think this is called It is never 100 percent correct.
You need some time to come back and adjust and sometimes you will need to consider everything and do
it again.
So it's not like you are just going to click on analyzed and it's going to work.
No there will be adjustment to do.
And I you do here.
There would be a big adjustment to do.
Now this is about the track point how to position it and how to adjust it in the next lecture we'll
move on to analyze of course forward.
I'll see you then.