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Hi guys in this lecture we are going to do the inverse of the previous lecture in the previous lecture.



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We controlled the rotation through position.



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It was easy by the way in this lecture.



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We wanted to control the position through the rotation.



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If you come to the demo over here and I play it you will notice that the needle is just wiggling every



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one second by 150 plus or minus.



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So now it's going negative and positive and the ball is following the needle.



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Obviously since this is already fixed.



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So how are we going to control the position of the ball through the rotation.



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Of course using expressions.



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Let's go to speed here which is a composition that does not have any animation at all.



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Let's look at the needle and let's give it the wiggle.



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So I would open a rotation press alt or option click on the stopwatch and I have the expression out



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right.



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We kill every one second.



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One hundred fifty plus or minus that will be cool I think.



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So let's try it.



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Well it's working.



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It's almost going to the maximum over here and to the minimum three.



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Let's go to market now and decide exactly the values of the market the open position.



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If you remember we need the minimum value and the maximum value.



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I would stop the animation Let's bring the timeline over here we can see.



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So the minimum value here is let's take it to the border here is almost 200 Let's take 200 for just



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simplicity and the maximum value is going to be around 1035 1000 will be OK.



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So we have $201 could start the expression we press alt or option and click on the stopwatch restudy



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expression.



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Of course now I'm going to use interpellation and I'm going to take linear the long while if you like



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and then I'll click on it.



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Let's start adjusting the parameters.



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What is the G.



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Is the rotation.



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This is the values that you are studying.



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So I can write here the whole expression I'll just use the pick me up click and take it to rotation.



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So now we have the rotation here.



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What is the minimum rotation.



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We know very well that the wiggle is 150 so it could be minus 150.



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Now if this is too much or too little I just added the maximum value here will be plus 150 are like



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150.



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And what are the values I want for the exposition here for minus 150.



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We agree on having 200.



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So I write to 100 and for the maximum 150 out of 1000.



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Very easy.



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Ok now this is not or not is that I want to control only the x.



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I don't want to touch the Y and I wanted to go up and down fine.



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So let's say this expression will give me the x value so I'll write X and I will write the semicolon



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here I'll type it.



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Press Enter now I need to return to values for the position like the rotation rate and one value.



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Here we want to return to values.



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So the first value is x.



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So you open the bracket and you write x.



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The second value doesn't change.



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This is the Y.



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So I can write an expression and you know do a lot of things.



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The easiest thing is to take the pick me up and drop it on the Y.



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Here you are.



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So it says transform position 1.



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So actually whatever the position one is now it's going to be over here and X will come from the linear



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expression here.



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Did it work.



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Am I good enough.



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Let's see.



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Click out no mistake.



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OK that's pretty good.



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No error message.



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I will play.



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Here you are.



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It's working at 100 percent.



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So actually it's pretty easy to work with the expressions provided that you go step by step and do that



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I think.



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Cool guys now the student that went in 3D and he had a lot of complication because it was the three



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values.



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Let's go to 3-D and see exactly how it works.



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And of course we can put the needle into 3D can put everything in 3-D.



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But I will focus now not even in 3-D The animation is still working.



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I did not even return the zero value but to make it consistent I can come to the position here and write



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karma bequeaths and use the pick me up to take the Zed's value.



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Here you are I click outside and I think it's working is it.



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Yes.



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So we are already an active camera.



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That's how it works.



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Notice what's happening here.



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I am using only the z rotation.



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If I were using the x and y rotation of course it would be much more complicated.



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Now as you know before jumping to 3D please Master 2D and then jump to 3D because here you have three



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values longer expressions more complicated rotations and even the position here will be at the three



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if you perceive B.



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You have three of them.



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So maybe you want to go step by step master to D and then move on to 3-D.



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Thank you very much for listening.



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I will see you in the next lecture and I hope you do lots of speedometers.