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expressions switches off randomly / bug?
Hi all,
Same bug as was asked about in this forum earlier in 2007 and 2008:
some expressions randomly switches themselves off – i.e. equal sign goess off, no error messages, no warnings. I just see that the chain brakes at some point. As soon as I switch them back on, some of the other ones go off.Same situation as was described: many layer copies, expressions refer to other layers / previous time, motion blur. After Effects CS3.
Expression example:
Rotaion X: thisComp.layer(thisLayer.index + 1).rotationX.valueAtTime(time – 1/25)There are about 30 layers logically chained one after another, forming a trail as the master layer rotates by keyframes.
Kind regards,
Sergei SokolovHere’s the project file zipped:
https://depositfiles.com/files/3ramxnwkz(8kb zip)Is there any limit of number of dependencies within a single comp?
Is there a “best practice” of how to handle such recursive expressions?
What to do with “time before times” which is referred to at frame 0 and by motion blur? -
3 Replies
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I’d use an expression like this:
delay = 1/25;
M = thisComp.layer(“c1 master”);
M.rotationX.valueAtTime(time – (M.index – index)*delay)
thisComp.layer(thisLayer.index + 1).rotationX.valueAtTime(time-1/25)It assumes that “C1 master” is lower in the layer stack than the layers with the expression. Pretty cool project, BTW.
Dan
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Sorry. Clearly the last line of the expression posted above doesn’t belong there. It should look like this:
delay = 1/25;
M = thisComp.layer(“c1 master”);
M.rotationX.valueAtTime(time – (M.index – index)*delay)Dan
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Thank You, Dan!
I got the idea: let each layer refer to the master layer, rather than to a neighbor.
Now it works fine.My expression for Y rotation is:
thisComp.layer(“c1 master”).rotationY.valueAtTime(time-(thisComp.numLayers – index + 1)/25)Same for X rotation.
And the shape layer size expression is
k = (thisComp.numLayers – thisLayer.index+1)*20;
[k, k];Inititally there are two layers: “c1 master” with keyframes, and the “c2” with these exp. Then just duplicate the “c2” 20-30 times to get extra circles.
Let me credit Satya Meka at ae.tutsplus and Mark Coleran for the concept of the effect.
Kind regards,
Sergei
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