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Guys in this lecture I will introduce you to the expression the regular expression will turn somehow

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random values.

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And it's very much you used to wiggle something to make it move left and right up and down whatever.

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And they kind of randomly We stayed in the project.

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Expressions that started that a b.

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Please open the file.

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And then within this project go to the composition interpellation rotation Tylene year and it's over

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here.

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Now we have a kind of a speedometer here.

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And our aim is to wiggle this needle if you like.

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We wanted to go left and right in a random way.

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And the best way to do that is to use the expression that's open the rotation now at and click on the

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stopwatch go to the arrow over here and go to property.

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You'll find that you have wiggle and you have temporal wiggle.

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So it has five parameters here the frequency the amplitude the octaves the amplitude multiplier and

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the time we are all interested and we are going to work with the first two the frequency and the amplitude.

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So click and selected and delete everything.

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The frequency is the number of times per second.

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You want a value to be returned to the rotation.

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So for example let's say two values.

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What is the amplitude the amplitude is like how much you want to wiggle.

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Let's say if you give it 100 it will wiggle 100.

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So some confusion about the concept here.

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The 100 is not minus 100 plus 100 actually.

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This is amplitude is going to wiggle 100 Binik is going to be going from zero to 50 and from zero to

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minus 50 and you have 50 down 50 up.

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The total is 100.

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I will show you how it works.

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Let's play the animation.

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Notice how it's wiggling it's not going to minus 100 and it's not going to plus 100 is just getting

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values in between.

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Now this is very nice.

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It's wriggling but it's not exactly what you want.

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How do you discover or find out what are the values that we get is returning to that question.

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Well it's very easy.

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I would like you now to go to your graph editor and in the graphic designer you most probably don't

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see anything.

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Select the rotation and you're not saying you have the wiggle expression see the values and the graph

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of the expression you come to the small I can hear short post expression graph.

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So it will show you the graph after the expression if you click on it are highlighted.

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Now you can see the values provided that you are in the value graph.

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If you go to a speed graph it's going to show you another kind of graph which will then notice of course

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the speed.

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So let's go to the value graph.

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And these are the values that has been returned by the get.

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Well guys you see these values have been returned and that's it.

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They are never going to change.

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It's not a random value every time prices respond.

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These values will change.

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No.

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These values are set as soon as you put the wiggle expression.

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If you play now you will notice how it's working actually.

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Let's come over here.

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And if you remember we put to one.

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Is the amplitude.

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So it is minus 50 and it is plus 50 over here.

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I don't know if you can see it.

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The amplitude goes from minus 50 to 50 which makes it 100.

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Of course if you take the absolute value.

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So the space that is wiggling in between is 100.

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It is not from zero to minus 100 and from zero to plus 100.

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So now the minimum amplitude here the negative one is around minus six.

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So over here it even went beyond the minus 50 or the 100.

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And the maximum amplitude is just over here I can see it on the graph.

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It is 45.

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So actually there's always going to wiggle from minus 50 to 50.

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In concept we have a small value here on top and that's it.

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Logically you would say that we get 90.

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So it goes minus 90 plus 90.

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It doesn't work like this.

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If you want minus 90 to 90 then you have to wiggle one hundred eighty.

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And yet this one even when not what.

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Let's look at it at one hundred eighty and not as it went out already.

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We've got the graph and your lowest point here is minus 101.

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Much more then the half.

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It does happen.

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This is the object of the vehicle to give you some kind of roundups.

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In our case here it would be very good if you put for example 150.

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OK go to the graph here.

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This is the maximum.

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I'm cool with it.

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Look at the needle.

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And then I go up here Matt.

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Cool fine.

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So this really is pretty cool.

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I'm happy from the values.

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Let's go back to the Spirograph and you have a different kind of graph with the speed and not see how

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jumping up very fast then go back slow.

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And so on.

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So this is the wiggle demystified and it give us a chance to work with the post expression.

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Now what we're likely to do here is to go back and write this expression in the rotation because in

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the next texture we are going to interpolate with the small not all that.

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Thank you for listening.

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We'll see you in the next election.