How to pick whip to scale but add an amount to it.

[Tom Holmes]

Hey Valerie.

You could indeed add ‘+100’ to the scale but then the second circle will always be 100 larger than the first, whether the first circle is set to 0 or 10000. If this is what you’re after then i would use the following on the second circle’s scale:
(italics are your layers names)

[thisComp.layer(“Cirlce_1“).transform.scale[0]+100,thisComp.layer(“Cirlce_1“).transform.scale[1]+100]

to make it more controllable, id add a sider controller to your second circle and instead of typing “+100” in the expression, pickwhip to the controller. That way you don’t have to keep going in to change your value.

If however you want the size increase to be relative, id increase the second by a percentage, not a constant value.

what i would do is add a slider controller to the second circle and then in the second circle’s scale expression add the following:
(italics are your layers/slider names)

s=(thisComp.layer(“Cirlce_1“).transform.scale[0]/100)*effect(“2nd_Circle_Increase_%“)(“Slider”);
[thisComp.layer(“Cirlce_1“).transform.scale[0]+s,thisComp.layer(“Cirlce_1“).transform.scale[1]+s]

s will take the scale of the first circle, divide it by 100 and then multiply it by the slider controller value. This then means the slider can be used to input a percentage of the first circle’s scale. The second part will take the two scale dimensions and add the value of the slider. Now if you set the slider to 50, the second circle will always be 50% larger than the first.

This will means the second circle will scale RELATIVE to the first.

hope this helps!

Tom 🙂