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Jason

Trick for making an effect do something every x frames in Harmony

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I was playing around with some noise effects to try and get this sort of noisy look and wanted the edges to update every 2 frames.  I was using the following expression:

currentFrame % 2 + currentFrame

This ends up looking like this in the x-sheet:

image.png

As you can see, it just increases the value every other frame.  But I thought.. what if I want to make this go every 3 frames, because on 2's it's a bit too noisy?  Not being a math wiz, I tried this:

currentFrame % 3 + currentFrame;

But of course that didn't work. I ended up with:

image.png

which isn't at all what I wanted. And it makes sense... currentFrame %3 returns 1, 2, 0, 1, 2, 0, 1, 2, 0... What I really wanted was 0, 0, 0, 1, 1, 1, 0, 0, 0.

So I thought about it a bit.. and came up with a cool way to do this.  This code works so you can really use ANY number of frames.  It's probably not the most mathematically efficient way, but hey, it's readable! 🙂

holdFrames = 2;
currentFrame - ( currentFrame-1)%(holdFrames);

And you can see the results here.. we can go crazy with it!  just change the holdFrames and it'll work perfectly. 🙂

holdFrames2.gif

 

 

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