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Hi guys and welcome to this new lecture in expression there's an important lecture actually I'm going



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to give you the concept of interpellation all the expressions that deal with interpellation we look



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at a few of them and it's up to you later on to develop your skills and to you know create more animations



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many times in animation what you want to do is to convert a linear movement a straight movement into



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a circular movement or vice versa.



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We also want to take a rotation movement or a circular movement or an Indian Movement and converted



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into a single value and want to extract all the values in between.



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Meaning if this circle goes left and right for example on its x axis I want this shape to move in a



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circle movement from the left to the right so this why will be left or right.



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And this one will be going on the x axis.



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So how do we do that.



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In fact there is a simple and easy to understand expression that we are going to use.



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First of all let's go for keyframes I'll give him the position here.



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And it is 250.



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Another is the X is drawn 50 that's very good.



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Let's remember this figure will come after one second and we make it 1700.



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So that's the moment I have is a linear movement that goes from 250.



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And the next one is 1700.



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I want the shape to rotate minus 45 degrees when the circle is at the beginning.



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So it would come on the side minus 45.



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And when it comes to the end it goes a 45.



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Now I don't want to do the framing because I might add seven eight of them make something nice or you



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know just complicate things later on I want to use the minimum keyframes and I want to have expressions



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that are very easy to be changed.



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So how do I do that.



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That's Vaizey Let's go to Bar.



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Let's open rotation because it's going to rotate.



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Now does that put the anchor point on top.



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That's OK.



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That's adjusted even more.



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So is NOT about it is just over could net from rotation



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from rotation.



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I'm going to press on it and click.



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I will open the expression.



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I would click on the smaller row and he can see interpellation interpellation is linear and linear.



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That gives you more parameters so actually you can use it was Jopling meters or you can use it with



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four Palamedes as we go into this one.



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And there is is is in and is out I will do only linear and is.



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And then actually you can do it by yourself.



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I will use the near you.



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Now look at the values that you have.



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We have t this is the value is going to be interpolated.



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We have it T.M. on.



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That's the minimum of the T and T maximum that's the maximum of the T and then it's return value 1 and



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value 2.



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So for this minimum we will get this value 1 for this maximum.



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We'll get this value too.



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And in between minimum and maximum aftereffect is going to give us the values and interpolate every



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all the values for us.



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So what is the D is the movement of cause of the present position of the ball.



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So all I have to do is to pick up it and put it on the X right not on both but on the position itself



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on X and it's giving you something very big that's ok.



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Doesn't matter.



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All we know this is position zero from the horizontal layer in this composition.



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Now what is the maximum.



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Remember we put 250 or this is the minimum salary.



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And then what is the maximum.



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Remember we said 1700.



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I delayed the other actors for here.



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I'm at about minus 45 or minus 45 for example.



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And 45 degrees.



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Of course we're looking at a rotation and year 45 degrees



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your.



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So what are you saying here.



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We're saying take the value of horizontal to the 50 here the X. And when it is drawn did 50 make it



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man minus 45.



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When it is 1700 make it 45 as simple as this when it is between 250 and seventeen hundred find the value



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that is between minus 45 and 45 in a linear interpolation and not logarithmic or pollution or any other



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kind of interpellation outlook outside run our mission.



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No not this year when it is on this side when it is on this side it is 250 minus 45.



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I don't like this let's make it 45 year and minus 45.



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Simple.



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So that's about it.



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So here 45 and here minus 45.



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Now I don't want this just to go once I'm going to ping pong.



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So I've done it and click and see loop out.



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You know there's that loop out and that will be very useful as being pong.



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Good bye.



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Now let's play it.



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And it's going left or right.



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And this one is going left and right.



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But in a circle moving I can change the values here.



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Let's then make it 90 and here I'll make it minus 90.



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Let's show you more.



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And here you are.



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It is working.



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Now what is linear here.



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I want you to go to choose the expression the rotation.



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Go to the Gulf and in here we want to click on the graph.



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Now I can see the graph of the expression.



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Of course this is a value graph.



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So this is what's happening.



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The value of the rotation is going negative minus 90 then positive 90 and so on.



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We know we haven't seen the graph here.



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So that's pretty cool.



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We have our interpellation and it's working very fine.



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Now if I can to borrow one and duplicate it as is true.



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But it here take this one and just move it somewhere over here.



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Now both of them going in this direction.



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And also I can do more I can you know rotate them from inside and make sure that we have them all connected



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on this point I'm not going to do that now but you can play with it.



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So this is it.



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It's pretty nice pretty easy.



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Now let's do something else.



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We have seen that we have another one in interpellation called ease with for values of five Palamedes



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here and change just one two is just as easy as it and the fact is that now when it's running it's going



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to be a bit smoother.



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What is the difference between one and the second one.



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So this one is smooth.



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Now what happened here.



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Look at the graph pull the graph has become very smooth and it's like a busy graph here but the graph



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we're back to if we open rotation and then it is totally different now I'm showing both of them in fact



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you notice the difference there's rotation only.



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And we need to open the expression for rotation.



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So this one is a bit more.



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Let's remove this one.



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Let's not show it at all and it would show this one only.



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So this one is rectangular or angled and this one is quite smooth.



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This is a sine wave or is sync movement.



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So this is how you use a linear and this is how we can use the glove.



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So not just here when I click as a show Post expression graph.



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So after the expression I now I removed it no I put it back here the same.



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If I choose this one the rotation here I can see the difference between is and just linear.



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So is is about.



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So it is about making it easy is if you want it is the motion.



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And then here is just a stick motion where the values go up and down.



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Remember that it's pretty easy when you get used to reading the references and then everything else



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just values.



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So here we have from this camp this lead presenter used transform position zero and take it from the



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present to.



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Good.



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So thanks very much for listening.



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I hope I was clear.



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If you have any questions come back and ask your questions.



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I'll be very happy to answer them all.