Change opacity every n-frames

[Dan Ebberts]

You could use something like this for the first group:

val1 = 30;
val2 = 0;
n = 18;
f = timeToFrames(time);
s = Math.floor(f/n);
s%2 ? val2 : val1

and switch the last line to this for the second group:

s%2 ? val1 : val2

Dan

[Luis Garcia]

Thanks Dan, it works perfectly!!! A lot of thanks Dan.

I have another question… How I can modify this expressions to get, for example, three or four groups of text layers doing this….

For example:

Layer 1 – 18 frames opacity 30, and then 0 for 36 frames
Layer 2 – 18 frames opacity 0, 18 frames opacity 30, and 18 frames opacity 0 again
Layer 3 – 18 frames opacity 0, others 18 frames opacity 0, and then 18 frames opacity 30

I mean like three blocks of 18 frames, and each layer appears in one of this blocks…. would it be possible?

A lot of thanks!

[Dan Ebberts]

This would be one way. You’d have to edit the first line for each layer:

pattern = [30,0,0];
n = 18;
f = timeToFrames(time);
s = Math.floor(f/n);
pattern[s%pattern.length]

Dan

[Luis Garcia]

Great again Dan! It seems that works perfectly. I will try it more slowly and feedback. I supousse that if I want to create a 4 group, in the first line I will put this, isn´t it?

pattern = [30,0,0,0]

And then edit for each group….that´s right?

A lot of thanks!!!

[Dan Ebberts]

That’s correct.

Dan

[Luis Garcia]

A lot of thanks Dan for your answer and time….

That´s a great solution for “my problem”.

I am wondering one thing now… I have 21 text layers, and I want to divide them into three groups…

I have tried to create three null objets and then linking each 7 text layers to their null object, and then apply the expressions into the null objects but I hadn´t any result…

Can´t I do it? Another way to do? Could I create a group or something like this or apply the expressions to my 7 layers at the same time??

Thanks again Dan!!!

[Luis Garcia]

Hi! One Question Dan… If I precompose I lost my effect of this expression… Could I modify the expression to work with precomposing??

I am thinking to create one precompose for every 7 text layer to organize the project better, but when I have done it… I lost the effect of the expression…

Could you help me? How would be the expression with precompose?

Imagine I have 3 precompose….

Thanks in advance!

[Dan Ebberts]

What exactly are you precomposing?

Dan

[Luis Garcia]

I am precomposing every 7 text layers, if I have 21 text layers, I am doing 3 precomposing with the same expressions… Yesterday, I did another prove and it worked… So I don´t know if perhaps before I will make a mistake….

Is correct to precompose with expressions and they have to work?

Thanks!

[Dan Ebberts]

It depends on the expression. If it doesn’t reference other layers it should be fine.

Dan