Hi guys and welcome to the first lecture in the expression section it's gonna be very interesting the
expressions.
And if you master them you're really going to create some fantastic animations without even a key free
to go step by step.
Now if you want to follow me please open expressions.
That's a start.
AP And in this project please double click on the quipping composition to open it and we start work
up your dead already.
Let's see what do we have here.
We have a board or a circle going up and down on a motion path as simple as this for five seconds.
And the star has no animation at all.
Now if you are in 2018 and you want to use expressions is good to bring up the parent and link column
for this.
You are right click on next the name for example you go to columns and make sure the linked each check
and you have the column.
Over here this is used for printing and also linking properties.
If you open the circle now down you will notice that in 2018 every property has a B.
This is a Piqui you can use this pic with a link of properties or you can come to the stopwatch press
alt or option on the Mac and click on it and you have the expressionlessly the menu open for you and
you have a certain space over here which is the editing space for the expression's.
Now here you have four icons.
The first one is enable or this but the expression now is.
But now you need the second one is for show posts expression graph after you have created an expression
you can go to the graph and see how the graph is behaving for this expression and you have another Equipe
and you have a small arrow here that says expression Englishman.
If you click on it you will find that life x has hundreds of expressions over here.
Now there is no need to learn all of them to learn about expressions or about linking.
It's good to learn only the most common and the most useful ones some of them you need an expert level
to start working on them.
To answer the expression if you don't want it at all all you have to do is to come to the stopwatch
based option on the map and click on it and it is it has disappeared.
Lestat for example taking the star here and deciding that since the start has no animation and you don't
want to create any keyframes you want to link the rotation of the star to the position because position
is animate if you are in 2018 you can start using this.
But I prefer to go over here to show you more.
So I guess art or option and the Mike and I will use this is the same in fact I'll click on it and fact
is that I can link to the whole position property X and Y or only take one single value which is the
x value or the y value.
Notation is a single value.
So it would be interesting to pick up or to link the rotation to the x value of the position.
Here you are.
You release an expression has been created for you.
That's quite right.
This expression is really plain English.
It says in this composition within the layer circle within the transformed properties.
Please take the value of position 0 position 0 means it is the exposition.
So you start 0 1.
So notice it means in this composition from the last circle got a position here and take the value X
as simple as this if you want to commit just click outside and your expression is written for you.
Now if you play the star will be taking the rotation of values from the exposition of the circle.
If escape through a bit here you are you're not the same value 2:59 and 2:59.
Of course when you increase is going to give a full rotation plus the value.
So it's 4 3 8 minus 360 the 360 year and the 78 you are now you animated the star without any keyframes.
In short you linked the rotation of the star to the x position of the circle.
That's it.
So if you don't like the expression you can disable it and see what happens.
Now it's not working at all it's disabled or you can't change it.
You can change it in different ways.
The first way is to give it another expression for example.
Actually it will be nicer if you pickup it to the Y Not as the old expression disappeared and now you're
using from the last circle in Transform position 1 which is the y value here.
If you click out play not just now it's going to go left and right because the value of position is
going up and down with the way you are.
It's pretty interesting right guys.
OK so now you have the start rotating left and right or clockwise and counterclockwise according to
the position 1.
If you were to create this animation with keyframes first is not going to be easy to sync them and then
it's going to take lots of work.
If there is any change in the circle movement then you have to go back and she the enemy but creating
the expression using the clip.
It's very easy.
Thank you very much for listening in this lecture and in the next one we see more about the trip and
how to write expression's.