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getting multiple objects to stay between two nulls…
I have two nulls and I’m trying to keep multiple objects between them both. I found this code that does it well for a ‘null 3’:
p1 = thisComp.layer(“Null 1”).position;
p2 = thisComp.layer(“Null 2”).position;
div(add(p1, p2),2);the problem is that I’m trying to do it for multiple objects so I thought I could ‘chain’ them, however, this leads things to ‘lock up’. This is my sample code for a ‘null 4’:
p1 = thisComp.layer(“Null 1”).position;
p2 = thisComp.layer(“Null 3”).position;
div(add(p1, p2),2);For some reason this new null, null 4, will not simply go between Null 1 and Null 3. I have no idea why not. Is my logic incorrect?
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3 Replies
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nevermind, there seems to be something much more dubious going on. the code works in its own comp, but something else in this comp is keeping it from acting normal. sorry.
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Let’s say you wanted to spread 5 layers between Null 1 and Null 2. I make sure the 5 layers are at the top of the layers stack (Layers 1 through 5) and give them expressions like this:
numLayers = 5;
p1 = thisComp.layer(“Null 1”).position;
p2 = thisComp.layer(“Null 2”).position;p1 + (p2 – p1)*(index/(numLayers))
Dan
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To add to this, if you need to move your layers to below another n layers (e.g. an adjustment layer)
numLayers = 5;
firstIndex = 1; //layers are at the top nowp1 = thisComp.layer(“Null 1”).position;
p2 = thisComp.layer(“Null 2”).position;p1 + (p2 – p1)*((index-firstIndex+1)/(numLayers))
You can make this more portable by adding a “Controller” layer, setting the constants in that layer, and then putting the “math” in each layer’s position (or rotation/opacity/whatever) property with references to the sliders on your “Controller” layer for access to the constants (nLayers, startIndex, anything else you need…)
Then if you make these presets, you can just drag the preset to each layer, and make a new null and add your controller preset each time you need to do this sort of thing…
Probably more of an answer than you bargained for…
–Will
getnmd.com
nationalboston.com
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