Frozen Random Number - After Effects Expression

Frozen Random Number

seedRandom(index,true);
myValue = random(50) ;

More expressions you might like...

Ignore Parent Rotation

Keep the current rotation of child, even when parent rotates.

Scale Layer to a Certain Width

Scale a layer to fit a pixel width. Apply to scale property

Control Property with Checkbox

Apply this expression to the property you want to control (like opacity) and make sure it is referencing the correct control layer.

Credit