1 00:00:01,320 --> 00:00:09,840 In the previous lecture we created these fantastic awesome by so lots of colors and we bit upgraded 2 00:00:09,870 --> 00:00:16,860 by creating a controls layer and we have key frames a slider and the pie animation is following the 3 00:00:16,860 --> 00:00:18,580 animation of these slider. 4 00:00:18,900 --> 00:00:19,860 That's pretty cool. 5 00:00:19,950 --> 00:00:29,310 But if I want to change the value of the by itself or the slice that will be changing 75 percent to 6 00:00:29,310 --> 00:00:36,210 something else I have to position the play head on the key frame maybe select the key frame and then 7 00:00:36,210 --> 00:00:40,620 change the value which makes it a bit hard to change. 8 00:00:40,650 --> 00:00:41,720 That's one. 9 00:00:41,880 --> 00:00:47,790 Also if I were to create similar slices here the calculation is going to be like awesome man. 10 00:00:47,790 --> 00:00:50,060 How is it gonna work. 11 00:00:50,070 --> 00:00:52,320 And how many key frames I'm gonna have. 12 00:00:52,320 --> 00:00:55,050 And if I want to change one value what will happen. 13 00:00:55,050 --> 00:01:03,240 So we actually need to simplify the key frame system and be able to create more slices in a very easy 14 00:01:03,240 --> 00:01:04,290 way. 15 00:01:04,290 --> 00:01:09,660 And for that we are going to use more expressions but there are two of them and they are very easy to 16 00:01:09,660 --> 00:01:09,990 use. 17 00:01:10,710 --> 00:01:15,120 So let's go back to project and create a dummy composition. 18 00:01:15,120 --> 00:01:16,630 We don't care about the name. 19 00:01:16,650 --> 00:01:23,460 We are going to pay attention to the frame rate and then I have twenty five frames per second so every 20 00:01:23,460 --> 00:01:30,570 second I have twenty five frames and click OK I'm gonna create an empty text there just to show you 21 00:01:30,570 --> 00:01:31,940 the values here. 22 00:01:32,250 --> 00:01:40,020 Come inside the text layer inside the source text art click on the stopwatch or option click to open 23 00:01:40,110 --> 00:01:46,080 the expression and the first expression I want to use if you come over here usually you will type it 24 00:01:46,080 --> 00:01:48,120 in it is time okay. 25 00:01:48,240 --> 00:01:49,800 As simple as this. 26 00:01:49,800 --> 00:01:53,150 So we have the time expression now in After Effects. 27 00:01:53,160 --> 00:01:56,130 You can read the time of the time indicator. 28 00:01:56,610 --> 00:02:01,170 So if the time indicator it's in the beginning time will be of course 0. 29 00:02:01,200 --> 00:02:02,730 If you go to one second. 30 00:02:02,780 --> 00:02:09,470 This is displaying one second and so on for two seconds and three seconds between. 31 00:02:09,480 --> 00:02:15,990 For example if I got 10 frames you will notice the value here is decimal and it is zero point four which 32 00:02:15,990 --> 00:02:23,490 is ten frames divided by the frames per second for the composition the frame rate. 33 00:02:23,490 --> 00:02:24,740 That will be twenty five. 34 00:02:24,990 --> 00:02:30,780 So it's ten divided by twenty five so at zero point four which you can't care less about the value all 35 00:02:30,780 --> 00:02:34,560 you know that at a certain time it gives you a certain value. 36 00:02:34,560 --> 00:02:43,610 As simple as this now we want to use an expression that will interpolate the time or interpret the time 37 00:02:43,900 --> 00:02:49,690 and return certain values for us to work with this expression is very easy. 38 00:02:49,840 --> 00:02:54,670 If you come to the arrow here you will go to interpolation and you have several of them. 39 00:02:54,740 --> 00:03:02,950 In fact they are almost all identical except there is is is in and is out we are going to use the linear 40 00:03:02,950 --> 00:03:10,480 one which will interpolate or interpret the time in a linear fashion straight line and it has similar 41 00:03:10,480 --> 00:03:19,570 parameters here that I will explain so linear will interpret T okay in our case D will be the time. 42 00:03:19,830 --> 00:03:25,150 So we are going to interpret the time and then we can have a minimum time. 43 00:03:25,170 --> 00:03:32,910 So let's say one second that is the minimum time and I can have the maximum time for example four seconds. 44 00:03:32,910 --> 00:03:41,490 So actually linear will interpret the time now between one second and four seconds and for the time 45 00:03:41,490 --> 00:03:50,960 being equal to one then it's going to return the value one which I would say 100 so at one second it 46 00:03:50,960 --> 00:03:54,210 will return one hundred and at four seconds. 47 00:03:54,290 --> 00:03:56,970 Let's say it will return four hundred. 48 00:03:56,970 --> 00:04:03,210 Okay so now then it will interpret the time between one second and four seconds. 49 00:04:03,210 --> 00:04:07,490 I would say Stern values in between 100 and 400. 50 00:04:07,910 --> 00:04:09,060 As simple as this. 51 00:04:09,230 --> 00:04:16,340 Now if you play with the time indicated at one second it will return one hundred at one second and before 52 00:04:16,700 --> 00:04:23,590 it will return one hundred because we specified that it starts from one then if you move on to four 53 00:04:23,590 --> 00:04:26,920 seconds it is gonna return four hundred. 54 00:04:26,920 --> 00:04:32,230 Okay so one for one hundred four hundred minimum maximum minimum maximum. 55 00:04:32,230 --> 00:04:39,960 As simple as this I think up to two seconds is gonna return a value in between 100 and 400. 56 00:04:40,270 --> 00:04:42,440 Interpreting the value of time. 57 00:04:42,550 --> 00:04:46,240 So it's gonna be two hundred if you go to three seconds. 58 00:04:46,240 --> 00:04:48,550 Of course is gonna be 300. 59 00:04:48,580 --> 00:04:55,480 So notice how the interpolation is happening or the interpretation of the time for every frame you move 60 00:04:55,510 --> 00:04:55,800 in. 61 00:04:55,840 --> 00:04:57,200 I'm gonna use page down. 62 00:04:57,340 --> 00:05:01,920 You will get into a certain value as simple as this. 63 00:05:02,020 --> 00:05:07,790 Now in our case it would be nice to use zero to 75 percent. 64 00:05:08,080 --> 00:05:11,190 As simple as this you get a guy's okay. 65 00:05:11,260 --> 00:05:17,650 Now if you don't want to see decimals here the best way is to add two fixed which you already know we 66 00:05:17,650 --> 00:05:21,870 have seen that and I put two digits that will be cool. 67 00:05:22,030 --> 00:05:25,680 So you notice it's very easy to use. 68 00:05:25,720 --> 00:05:32,370 So in the next lecture we are going to use the near interpolation for time to animate our PI. 69 00:05:32,500 --> 00:05:34,270 And now I'm going to delete this one. 70 00:05:34,830 --> 00:05:37,920 I'll get the component we don't need it and I will see you in the next lecture.