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Changing x position of last keyframe using a slider for template

Explorer ,
Mar 04, 2024 Mar 04, 2024

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I've searched for an expression that will use a slider to change the x position on the last keyframe but can only seem to get it work on adjusting the first keyframes x position instead. 

Any help as to what I need to amend in the expression to get it work would be great. 


Screenshot 2024-03-04 at 12.16.39.pngScreenshot 2024-03-04 at 12.17.00.pngScreenshot 2024-03-04 at 12.17.16.png

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Error or problem , Expressions

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correct answers 1 Correct answer

Engaged , Mar 04, 2024 Mar 04, 2024
firstValue = key(1).value[0];
sliderValue = effect("Slider Control")(1);

   x = linear(time, key(1).time, key(numKeys).time, firstValue, sliderValue);
// x = ease(time, key(1).time, key(numKeys).time, firstValue, sliderValue);
// x = easeIn(time, key(1).time, key(numKeys).time, firstValue, sliderValue);
// x = easeOut(time, key(1).time, key(numKeys).time, firstValue, sliderValue);
[x, value[1]]

In your screenshot you're not using a linear interpolation so you may need to use an ease() instead of

...

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LEGEND ,
Mar 04, 2024 Mar 04, 2024

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Your code makes no sense. The driver in a linear() function is time or another slider's input, not the property base value itself. Simply fix the function and it will work.

 

Mylenium

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Explorer ,
Mar 04, 2024 Mar 04, 2024

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Hi Mylenium, 

If you could help me with what is correct that would be great. 

Thanks

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Engaged ,
Mar 04, 2024 Mar 04, 2024

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firstValue = key(1).value[0];
sliderValue = effect("Slider Control")(1);

   x = linear(time, key(1).time, key(numKeys).time, firstValue, sliderValue);
// x = ease(time, key(1).time, key(numKeys).time, firstValue, sliderValue);
// x = easeIn(time, key(1).time, key(numKeys).time, firstValue, sliderValue);
// x = easeOut(time, key(1).time, key(numKeys).time, firstValue, sliderValue);
[x, value[1]]

In your screenshot you're not using a linear interpolation so you may need to use an ease() instead of linear()

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Explorer ,
Mar 05, 2024 Mar 05, 2024

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That's amazing, thanks for that. Very helpful. How would I adjust the easing to say a specific in and out velocity. Or is that not possible? 

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