Finding the time when a prop reaches a specific value

[Dan Ebberts]

There are a number of ways to approach it, all of which are messy and involve a frame-by-frame search. The best solution depends on whether you need the first occurrence, the most recent occurrence, or all occurrences, and whether the value will be coming from above the target value, below the target value, or either.

Dan

[Roland R. kahlenberg]

But Dan, we mostly love only messy stuff. ☺

I think based on all occurrences and from both above or below (the value) will provide an ideal/robust solution. I feel that the robustness of the solution will more than make up for the slow compute times of the Expressions.

Cheers
– Roland

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[Dan Ebberts]

Ugh. So what would the result look like?

Dan

[Roland R. kahlenberg]

This is what I have now. It’s of course incomplete.
I want a layer to inherit specific colors based on the value of a rotation prop. I don’t want the color values to pop (change immediately) but instead to have a slow change of the colors. Hence, I thought I would use the Interpolation Method.

targetProp = thisComp.layer(“Hand”).transform.rotation;
targetVal1 = linear(time,0,1,effect(“Color Control”)(“Color”),effect(“Color Control 2”)(“Color”));
targetVal2 = linear(time,0,1,effect(“Color Control 2”)(“Color”),effect(“Color Control 3”)(“Color”));
targetVal3 = linear(time,0,1,effect(“Color Control 3”)(“Color”),effect(“Color Control 4”)(“Color”));

if (targetProp >=0 && targetProp<1001)
{ targetVal1 }
else if (targetProp >= 1001 && targetProp<2001)
{ targetVal2 }
else if(targetProp< 0)
{ targetVal3 }
else {effect(“Color Control 4”)(“Color”)}

Sense make?

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[Dan Ebberts]

Wouldn’t something like this work?


targetProp = thisComp.layer("Hand").transform.rotation;
c1 = effect("Color Control")("Color");
c2 = effect("Color Control 2")("Color");
c3 = effect("Color Control 3")("Color");
c4 = effect("Color Control 4")("Color");

if (targetProp < 50)
ease(targetProp,-50,50,c1,c2)
else if (targetProp < 1050)
ease(targetProp,950,1050,c2,c3)
else
ease(targetProp,1950,2050,c3,c4);


Dan

[Roland R. kahlenberg]

HAH!!!
I knew my problem solving was a major issue. I’ve not written Expressions for a while – and it shows.

Thanks Dan!

TypeGEMs – the Definitive Type Gizmo for AE
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