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Dan Ebberts Light Falloff & Digieffect Light Falloff Plug-in
Hi,
I downloaded a trial version of the Digieffects light falloff plug-in (https://www.digieffects.com/product/falloff_lighting) and played around with it but was not entirely satisfied with the results (I am new to After Effects so it could be me in the way I set up the layers and I may be looking for something that is not fully possible in AE).
I wanted to compare it with the expression that Dan Ebberts wrote for light falloff utilizing the Diffuse & Specular material properties https://www.motionscript.com/design-guide/falloff.html, and I was wondering if anyone knows how to adapt this expression for more than one light in a scene – it is completely beyond my very basic knowledge of expressions.
Any help, guidance and input would be great.
Many thanks
Chris
decay = .005;
noFalloff = 200;L = thisComp.layer("Light 1");
d = length(L.transform.position,transform.position);
if (d < noFalloff){
value;
}else{
value/Math.exp((d - noFalloff)*decay);
}
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5 Replies
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Something like this maybe:
decay = .005;
noFalloff = 200;
accum = 0;
for (i = 1; i <= thisComp.numLayers; i++){ if (index == i) continue; try{ thisComp.layer(i).lightOption.intensity; L = thisComp.layer(i); d = length(L.transform.position,transform.position); if (d < noFalloff){ accum += value; }else{ accum += value/Math.exp((d - noFalloff)*decay); } }catch(err){ continue; } } Math.min(accum,value) Dan -
Mr. Ebberts,
This is terrific! – I just tried a quick test and it looks like it will be just the thing I needed.
Thank you very much for going to the trouble to do this (and I am stunned at how quickly!)
Regards,
Chris
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The Ebberts is astonishing that way.
– The Great Szalam
(The ‘Great’ stands for ‘Not So Great, in fact, Extremely Humble’)No trees were harmed in the creation of this message, but several thousand electrons were mildly inconvenienced.
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Hi Dan,
First, thanks for cranking out these solutions. I tried to cut and paste the above “multiple light” solution into the diffuse property and AE returned this error:
After Effects warning: Expected: ;
Expression disabledError occurred at line 5.
Does this make sense to you? FWIW, I’m using CS3.
Thanks,
Paul -
Hello,
I was wondering if this expression works when applied to a nested comp. Should the layers within the comp respond to the expression? I’ve tried applying it and it doesn’t seem to have any effect.
Thanks,
EoinIntel Mac, AE CS4.
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