The Expressions Thread

Can’t figure out how “valueAtTime + offset” works…. If I put value -1 on my Offset slider, then animation starts at 32-nd frame. if I put -0.5 value, then it starts at 20-th frame…. Very strange, at least for me (My comp framerate is 25fps).

Can you explain please how it works?

5p1r17 said
Can’t figure out how “valueAtTime + offset” works…. If I put value -1 on my Offset slider, then animation starts at 32-nd frame. if I put -0.5 value, then it starts at 20-th frame…. Very strange, at least for me (My comp framerate is 25fps). Can you explain please how it works?

if your first keyframe is on 7th frame then this makes perfect sense

5p1r17 said
Can’t figure out how “valueAtTime + offset” works…. If I put value -1 on my Offset slider, then animation starts at 32-nd frame. if I put -0.5 value, then it starts at 20-th frame…. Very strange, at least for me (My comp framerate is 25fps). Can you explain please how it works?

Time is always measured in seconds and in that code fragment that I dashed off, I specified frames and forgot to convert… Oops!

But here’s roughly how it works….

myOffset = effect("Offset in Frames")("Slider").value; 
//let's assume the user sets this to 25 for a 1 second offset.

completion = thisComp.layer("Controller").effect("Completion %")("Slider"); 
// Note: a reference to the Completion % Slider OBJECT..... NOT it's value.

mySampleTime = time + framesToTime(myOffset); 
//Look! - I remembered to convert to seconds this time.

myCompletion = completion.valueAtTime(mySampleTime); 
// completion is just a shorthand for the slider object. 
// With the value of 25 that we put in before, the Completion % slider will be sampled 
// not at the current time, but 1 second ahead of the current time... 
// that means that for this layer, everything happens 1 second earlier, 
// because it's looking 1 second ahead of itself....

Does that explain it?

I should have guessed…. framesToTime… Thanks Felt, now everything is clear now!

My new project has over 1000 lines of code (expressions) almost no effects, works super fast, very user friendly and super useful Can’t wait to finish and upload!

Mocarg said
My new project has over 1000 lines of code (expressions) almost no effects, works super fast, very user friendly and super useful Can’t wait to finish and upload!

Can’t wait to see that

Mocarg said
My new project has over 1000 lines of code (expressions) almost no effects, works super fast, very user friendly and super useful Can’t wait to finish and upload!

I hope that’s 1000 unique lines Mo, and that you haven’t been cheating by cutting and pasting.

Mocarg said
My new project has over 1000 lines of code (expressions) almost no effects, works super fast, very user friendly and super useful Can’t wait to finish and upload!

Same here. Right now I just hope we are not creating the same thing /mine is full of pie charts and circle graphs, as a new project for envato’s most wanted/

felt_tips said

Mocarg said
My new project has over 1000 lines of code (expressions) almost no effects, works super fast, very user friendly and super useful Can’t wait to finish and upload!

I hope that’s 1000 unique lines Mo, and that you haven’t been cheating by cutting and pasting.

Well i did use Copy/Paste A LOT! But i had to change some thing in every expression. It’s cool

DoubleX said

Mocarg said
My new project has over 1000 lines of code (expressions) almost no effects, works super fast, very user friendly and super useful Can’t wait to finish and upload!

Same here. Right now I just hope we are not creating the same thing /mine is full of pie charts and circle graphs, as a new project for envato’s most wanted/

We are But why is that a bad thing? I don’t care if i get into Most Wanted or not i just want to make something unique…