Need a Expression that is NOT random or Wiggle

[benb91907431]

Hi,

I've got a checkbox control that is parented to Opacity of an object that i want to come on and off every 0.5 seconds to create a blinking effect.

I don't want a random blink, i don't want a wiggle, i'd like a fixed expression for the checkbox control to switch from on and off indefinitely for my composition.

Please can you help? i know it's got to be simple i just can't figure it out.

Thanks

[Mylenium]

Math.round(time/0.5)*100

Simply apply it directly to the opacity.

Mylenium

[benb91907431]

when i apply that expression it turns opacity to 100 after that time but after the same amount of time after doesnt turn it back to 0%, i'd like it to alternate between exact values 100 & 0 every half second.

thanks for your help

[Mylenium]

My bad... That should have been a modulus operator:

Math.round(time%0.5)*100

Mylenium

[calliday]

That value will give a changing gradient from 0 to 50% opacity over the course of half of a second. This is more code but this works for me:

t = time%1       // Get get the current second (as a value between 0 and 1)

if(t > 0.5)         // If the current second is in the last half

    100              // Return full opacity

else                  // The second is in the first half

    0                  // Return no opacity

[imeilfx]

You can use expressions but for that kind of easy spring, blink and wiggle stuf I'm using free script/plugin called DUIK. It's mostly known from being awesome rigging tool, but it also have several usefull tools among them also blink.
You can find Duik here: https://rainboxprod.coop/en/tools/duik/ 

[Kevin-Monahan]

Hi BenB,

Did any of these answers help you achieve the optimum result?

Thanks,

Kevin

[Picmention Matthias]

You also can try

50+(Math.sin(time*Math.PI)*50);

or simply create two Keyframes. One for 0 and one for 100 and use expression loopOut("pingpong");

[guilhermeb47584749]

the loopOut("pingpong"); works great for my purpose! thanks a lot!