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Random number from array to target layer
Hi Everyone,
Ok hopefully this is simple enough. Here’s my expression…
posx = thisComp.layer(“Emitter.2”).transform.position[0];
posy = thisComp.layer(“Emitter.2”).transform.position.wiggle(thisComp.layer(“WiggleEmitter”).effect(“Freq”)(“Slider”),thisComp.layer(“WiggleEmitter”).effect(“Amp”)(“Slider”))[1];
[posx,posy];
All I want to do is where it references “Emitter.2” I want to have an expression that says randomly select an number from an array of x amount and apply to this reference. So when I duplicate the layer up it will pick a different number each time.
Eg. Emitter.1 / Emitter.2 / Emitter.3 / Emitter.2/ Emitter.1 / Emitter.3 and so on…
Hope that makes sense!
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5 Replies
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This would be one way to randomize references to the 3 layers:
seedRandom(index,true);
n = Math.floor(random(3)) + 1;
emitterName = “Emitter.” + n;
posx = thisComp.layer(emitterName).transform.position[0];Dan
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Very impressive – Thanks Dan!
One more question…If I have other expressions on the same layer that I want to have the same value as what the random expression chooses…how would I do that?
eg.
This is on position x and y and works great:
seedRandom(index,true);
n = Math.floor(random(3)) + 1;
emitterName = “Emitter0” + n;
posx = thisComp.layer(emitterName).transform.position[0];
posy = thisComp.layer(emitterName).transform.position.wiggle(thisComp.layer(“WiggleEmitter”).effect(“Freq”)(“Slider”),thisComp.layer(“WiggleEmitter”).effect(“Amp”)(“Slider”))[1];
[posx, posy] – value + wiggle(thisComp.layer(“WiggleEmitter”).effect(“Freq”)(“Slider”),thisComp.layer(“WiggleEmitter”).effect(“Amp”)(“Slider”));This is on the z and needs to have the same random value as the x and y have for the emitter number:
seedRandom(index,true);
n = Math.floor(random(3)) + 1;
emitterName = “Emitter0” + n;
thisComp.layer(emitterName).transform.position[2];thanks again Dan – you’re talented guy!
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You’d have to put the random calculation on a slider control and have both expressions pick it up from there. The expression on the slider would just be:
seedRandom(index,true);
Math.floor(random(3)) + 1;Dan
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You could add a slider control and generate the random number there then have X and Z get the number from there.
This is the code you should put on the slider control:
seedRandom(index,true);
Math.floor(random(3)) + 1;And this would be the updated code for Z:
n=effect("Slider Control")("Slider").value;
emitterName = "Emitter0" + n;
thisComp.layer(emitterName).transform.position[2];
-Lloyd
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Brilliant – thanks Both!
Really really appreciate it!
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