-
Value changes a few frames before it’s supposed to
I’m using a text layer to drive the size of a background box using sourceRectAtTime.
The text is driven by an expression that updates the value using the comment inside the markers, much like using hold keyframes but I do not need to drag them.The box adjusts its size to the corresponding dimensions three frames before the marker is reached. I do not understand why. Can anyone help me understand?
Thanks.
Expresion for the text layer:txt = value;
n = 0;
if (thisComp.marker.numKeys > 0){n = thisComp.marker.nearestKey(time).index;
if (thisComp.marker.key(n).time > time) n--;
if (n > 0) txt = thisComp.marker.key(n).comment;
}
txt;
-----------
Expression for the scale of the box:t = thisComp.layer("xp").effect("Layer Control")("Layer");
margin = thisComp.layer("xp").effect("margin")("Slider");
r = t.sourceRectAtTime(time-t.inPoint,false);
w = r.width*t.scale[0]/100 + margin;
h = r.height*t.scale[1]/100 + margin/2;
[w/width,h/height]*100 -
7 Replies
-
Hard to say without seeing it, but I’d check this:
t.sourceRectAtTime(time-t.inPoint,false);
Why do you have t.inPoint in there?
Dan
-
Hey Dan,
The text layer does not start at the beginning of the composition, I added that so the layer didn’t start showing at the very first frame.
I just removed it to test and the problem worsens, now the size increases to the second value the moment it hits the first marker.I can send you the file if you don’t mind looking at it.
Thanks,
-
I managed to solve it by adding .1 to the inPoint, but I can’t understand why.
If you can explain why is happening it’s be greatly appreciated.t = thisComp.layer("xp").effect("Layer Control")("Layer");
margin = thisComp.layer("xp").effect("margin")("Slider");
r = t.sourceRectAtTime(time-(t.inPoint+.1),false);
w = r.width*t.scale[0]/100 + margin;
h = r.height*t.scale[1]/100 + margin/2;
[w/width,h/height]*100 -
I’d have to see it, but you probably just need to compensate for have the text layer’s startTime not at time = 0.
Dan
-
I think is that too, but can’t understand why the frames since the layer begins several more frames after.
Can I send you the file? I have your email already.
-
Sure.
Dan
-
I think this expression (sourceReactAtTime) is either broken or not quite ready to be included with AE.
I’m getting all sorts of unwanted jumps and resizes even after I compensated for the in point of the layer. It’s been more of a hindrance than a helper.Reporting a bug to adobe, once an easy task, it’s now useless with their new “forum” format.
Reply to this Discussion! Login or Sign Up