1
00:00:01,020 --> 00:00:04,600
Hi guys in this lecture you are going to learn about the track point.

2
00:00:04,620 --> 00:00:08,930
What are these squares that you see here and what is this place in the middle.

3
00:00:08,940 --> 00:00:15,180
Also we are going to position the attack point on a certain element or certain visual that we want to

4
00:00:15,180 --> 00:00:16,480
talk with in the video.

5
00:00:16,940 --> 00:00:22,830
And in the next lecture we are going to analyze and talk and then we will attach a target just from

6
00:00:22,830 --> 00:00:24,410
overdye.

7
00:00:24,520 --> 00:00:27,150
First there is something important I need to bring to your attention.

8
00:00:28,000 --> 00:00:29,260
Let's look at that.

9
00:00:29,270 --> 00:00:30,890
Here we have trackball into one.

10
00:00:30,940 --> 00:00:38,920
Now every time you click on the track motion a rocket is created within the rocket you'll have a track

11
00:00:38,920 --> 00:00:40,070
point one.

12
00:00:40,120 --> 00:00:44,070
So that is there is no difference between the two track points.

13
00:00:44,110 --> 00:00:48,280
If you click again by mistake OK now you have so many Thakurs.

14
00:00:48,490 --> 00:00:54,580
Please if this is the case select all the trackers that you don't need keep only tracker 1 and press

15
00:00:54,580 --> 00:01:03,850
delete to delete all the ruckus except that point to what I would 12. not selected for Antoine and you

16
00:01:03,860 --> 00:01:08,060
going to that Antoine was in your pun.

17
00:01:08,190 --> 00:01:13,490
Let's understand a bit about the trackball and if you zoom in I'm using the mouse scroll here is.

18
00:01:14,550 --> 00:01:22,110
All of this is the trackball one is a big square which is the search region and there is a smaller square

19
00:01:22,200 --> 00:01:30,170
which is the featured region and there is a cross there that is called the attachment.

20
00:01:30,190 --> 00:01:33,070
The big square here is the situation.

21
00:01:33,070 --> 00:01:39,960
This is where aftereffect is gonna search to determine the position of the featured region.

22
00:01:39,970 --> 00:01:45,940
The smaller square within the smaller square you are going to look for a search in demonology.

23
00:01:46,000 --> 00:01:52,480
If you come to options here you will notice that it's a tracker one and there are the challenges here.

24
00:01:52,480 --> 00:01:59,980
You could look for a color AGP for luminance or saturation livingness is how bright or is the pixel

25
00:02:00,290 --> 00:02:02,630
is the best to work with.

26
00:02:02,900 --> 00:02:06,800
But I also see a situation in some cases can be very useful.

27
00:02:07,000 --> 00:02:13,540
So it's going to look within the feature region the smaller square for the luminance and then is going

28
00:02:13,540 --> 00:02:17,320
to position the attach point and keyframe it.

29
00:02:17,320 --> 00:02:21,830
So this is the whole concept within the search engine.

30
00:02:22,090 --> 00:02:27,850
Place the feature region and position the attach point and keyframe it.

31
00:02:28,000 --> 00:02:33,880
If you come to the land over here there is the Fisher Center the Fisher Center is the center of the

32
00:02:33,880 --> 00:02:35,220
whole point.

33
00:02:35,250 --> 00:02:36,290
If you are in.

34
00:02:36,370 --> 00:02:40,990
If I move it very slowly it is moving the whole track.

35
00:02:41,680 --> 00:02:43,700
And then there is the feature size.

36
00:02:43,720 --> 00:02:45,920
This is the size of the feature region.

37
00:02:45,970 --> 00:02:48,720
You see you can make it bigger or smaller.

38
00:02:48,790 --> 00:02:53,090
It is not good at all to make it bigger than the search region.

39
00:02:53,230 --> 00:02:55,160
Doesn't make sense also.

40
00:02:55,220 --> 00:03:00,280
Also you can come over here click on the corners and make it the size that you want from here.

41
00:03:00,280 --> 00:03:03,310
Is much better because you make it bigger and that's what's happening.

42
00:03:03,310 --> 00:03:05,940
The search engine also is getting bigger.

43
00:03:05,950 --> 00:03:07,540
That's a cool way also to work.

44
00:03:07,540 --> 00:03:12,710
I will undo all this and then you have the search sites.

45
00:03:12,930 --> 00:03:15,310
This is the size of the search region.

46
00:03:15,560 --> 00:03:20,510
Of course you can change the values from here but much more practical to click on one corner and start

47
00:03:20,510 --> 00:03:26,850
moving it around to the site for your search region and you have the attach point.

48
00:03:26,870 --> 00:03:32,360
This is the position of the attached point not is now it's in the middle of the composition you have

49
00:03:32,360 --> 00:03:40,520
over here the confidence higher values means that either X is very confident in his analysis for the

50
00:03:40,520 --> 00:03:44,260
track point lower values like 2 or 3 percent.

51
00:03:44,270 --> 00:03:47,360
It means that that point is lost completely.

52
00:03:47,360 --> 00:03:49,130
You know we can see what it is.

53
00:03:49,160 --> 00:03:56,390
So the curve in this is an indication of how good is your track point in terms of the feature size and

54
00:03:56,480 --> 00:03:57,920
the search region.

55
00:03:58,690 --> 00:04:03,680
Now the next step is to position the track for what you wanted to track.

56
00:04:03,820 --> 00:04:08,430
So I would zoom out here and I want to track this little guy over here.

57
00:04:08,560 --> 00:04:10,930
You can click anywhere within the track point.

58
00:04:11,080 --> 00:04:18,610
And when the mouse pointer looked like he moved pointer you can click and drag and position it whenever

59
00:04:18,610 --> 00:04:19,270
you want.

60
00:04:19,270 --> 00:04:24,910
Notice how he's tried to zoom in because actually we usually track very small points.

61
00:04:24,950 --> 00:04:31,110
Now I will use our option on the Mac and zoom in spacebar to position.

62
00:04:31,330 --> 00:04:34,190
First of all you focus on the search engine.

63
00:04:34,300 --> 00:04:41,170
Make sure the search engine is big enough to always include what ever you want to track.

64
00:04:41,200 --> 00:04:43,650
Then you focus on the feature region.

65
00:04:43,690 --> 00:04:46,620
This is what you want to track and just move it like this.

66
00:04:46,660 --> 00:04:50,960
I prefer to do that and re adjust the search engine.

67
00:04:51,070 --> 00:04:52,360
That's what I usually do.

68
00:04:53,260 --> 00:04:57,580
Yet you can start resizing the feature region here or the small square.

69
00:04:58,060 --> 00:05:04,060
It's important that within your search engine there is always the element that you are trying to track

70
00:05:04,810 --> 00:05:09,630
and in the feature region there is something that is you know different from the background the limit

71
00:05:09,820 --> 00:05:11,500
is higher than the background.

72
00:05:11,500 --> 00:05:16,050
So if you call the guy the foreground It has higher luminance than the bagong.

73
00:05:16,240 --> 00:05:21,470
So for me I think this is called It is never 100 percent correct.

74
00:05:21,490 --> 00:05:26,110
You need some time to come back and adjust and sometimes you will need to consider everything and do

75
00:05:26,110 --> 00:05:26,700
it again.

76
00:05:26,860 --> 00:05:31,260
So it's not like you are just going to click on analyzed and it's going to work.

77
00:05:31,420 --> 00:05:33,770
No there will be adjustment to do.

78
00:05:33,850 --> 00:05:35,420
And I you do here.

79
00:05:35,560 --> 00:05:39,430
There would be a big adjustment to do.

80
00:05:39,550 --> 00:05:44,780
Now this is about the track point how to position it and how to adjust it in the next lecture we'll

81
00:05:44,790 --> 00:05:47,890
move on to analyze of course forward.

82
00:05:48,040 --> 00:05:48,990
I'll see you then.