IF – AND – THEN expression

[Jim Lefevre]

Aaaaahhhh… ok… after some more digging and help from a colleague here at work I’ve stumbled up this!…

maskOp = thisComp.layer(“MOON_REVOLVE”).transform.orientation[1];
if (maskOp > 90 && maskOp <270){
[0];
}else{ [100] ; }

so there you have it!

&&

works a treat!

http://www.jimlefevre.com

[Darby Edelen]

[jim lefevre] “maskOp = thisComp.layer(“MOON_REVOLVE”).transform.orientation[1];
if (maskOp > 90) AND (maskOp <270){
[100];
}else{ [0] ; }”

if((maskOP > 90)&&(maskOp < 270))

The && is an operator that will return true only if the statements on both sides evaluate to true.

There is also the || operator which will return true if one of the statements on either side is true (the ‘OR’ operator).

If you’re doing this to make the layer invisible when pointing away from the camera there’s a better solution:

https://motionscript.com/design-guide/invisible-facing-away.html

Darby Edelen

[Jim Lefevre]

Darby,

Thank you so much!

Yes, I’d actually forgotten about that pointing away from camera thing although actually it wasn’t what I needed as I ended up needing layers to be visible for only a quarter of a revolution – 90 degrees – and not the 180 that that gives.

More importantly what you’ve suggested is far more valuable as an introduction to the && and || operators ( although it’s taken me a fair few minutes to find the ‘|’ key on my keyboard (upper case ” if anyone is interested)!!

I shall start to experiment and see how stackable they are too.

Many many thanks Darby and apologies for the late reply – sudden deadline swamped me.

http://www.jimlefevre.com

[Bevis Lowry]

Hi guys.
I wonder if you could help me with a related question. I’m quite new to scripting.
I’m trying to do something similar to if/else but with gradations in between.
It goes something like this:
If Object A has Y coordinate 600, the scale Object B to 20.
If Object A has Y coordinate 300, then scale Object B to 100.

Now here’s the bit I can’t figure out:
If Object A’s Y coordinates are between 300 and 600, then scale Object B between 20 and 100

Any ideas would be appreciated 🙂

[Kalleheikki Kannisto]

expression for object B scale:

y= thisComp.layer("A").transform.position[1];
s = linear(y,300,600,100,20);
[s,s]

[Bevis Lowry]

Thanks Kalle. It worked great. I just had to reverse the 100 and the 20 🙂

[Max Motionmoustache]

I got this formula in my position expression panel: if(thisComp.layer(“Control”).effect(“Man scale”)(“Slider”)=73) [441.1,-108,3] else [507.1,-108,3];
I want the position that I sued expression on, to change to the values I have given to it when other layer’s slider control is at 73 one position and when it moves other position property. But I haven’t used IF expression before in AF, mby i’m applying it to the wrong property, i’m not sure. Gives an error.
Or I thought to make the pickwhipe forumla, but forgot algebra from school =) to make basically position property X depend on anothe slider property. bullet points of that formula are
(property X)=441,1 when slider = 73
and
(property X)=507,1 when slider = 453
so expression for position like
value[Z+H*slider value,0];
Z and H are unknown

made if expression by https://www.premiumbeat.com/blog/use-ifelse-statements-effects/ but didn’t work out basically..

if(thisComp.layer("Control").effect("Man scale")("Slider")=73) [441.1,-108,3] else [507.1,-108,3];

[Dan Ebberts]

One thing I see is that JavaScript’s equality test is:
==
not:
=

Dan