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P
Phendyre
Participant
August 17, 2023
Question

Project expression errors - undefined value

  • August 17, 2023
  • 2 replies
  • 1628 views

First timer here and I appreciate anyone's time to help educate me a bit. I have an older aep file that the expressions are erroring out. I admit, I know absolutely zero about expressions in AE, I'm an extreme novice here. Below are the two expressions, I would welcome any direction/guidance on how to resolve these issues:

 

EXPRESSION ONE:

x = Math.round(effect("Camera Angle")("Slider"))

Error: Undefined value used in expression (could be an out of range array subscript?)
if (x > 6) {
    6
}
if (x < 1) {
    1
}

 

EXPRESSION TWO:

x = Math.round(effect("Scene Setup")("Slider"))

Error: Undefined value used in expression (could be an out of range array subscript?)
if (x > 4) {
    4
}
if (x < 1) {
    1
}

 

If more context is needed to resolve the issue, I will try to provide what I can - the use case is that it shifts the camera point of view around 6 different positions, from zoomed out , zoomed in, and zoomed into the four corners of the screen. Not sure if that helps or not.

 

Again your feedback and guidance is appreciated.

    2 replies

    Mylenium
    Mylenium
    Legend
    August 17, 2023

    You may want to read ho this stuff actually works in the online help you and educate yourself about basics of Javascript. Your code makes absolutely no sense even on the most basic level from not adhering proper if()else{} syntax to not even using a single reserved keyword to tell AE what it is supposed to do. Since you seem to treat those numbers as indices, the actual position values would have to be defined somewhere as well and then you can't just use plain number. So perhaps it should look more like this:

     

    centX=thisComp.width*0.5;

    centY=thisComp.height*0.5;

     

    viewDef=[centX,centY,0]

    viewA=[200,300,0];

    viewB=[400,800,0];

     

    if (x > 6)

    {mView=viewB}

    else if (x < 1)

    {mView=viewA}

    else

    {mView=viewDef};

     

    [mView[0],mView[1],mView[2]]

     

    Mylenium

     

     

     

    P
    PhendyreAuthor
    Participant
    August 17, 2023

    Thank you both for your feedback, I agree, I have much to learn and plan to dig into it. having the context from your responses will help greatly.

     

    cheers.

      Dan Ebberts
      Community Expert
      Dan EbbertsCommunity Expert
      Community Expert
      August 17, 2023

      The first expression doesn't define what happens if the slider is between 1 and 6. The second expression has the same issue for values between 1 and 4.

      For the first expression, you might be looking for something like this:

      x = Math.round(effect("Camera Angle")("Slider"));
clamp(x,1,6)
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