Per-light exports of multiple sampled variables ?

[mrice]

I'm trying to set up some shader exports from area lights, but I cant seem to understand at what stage mantra is getting the variable from an illuminance loop during per light exports.

I thought some array hackery in the illuminance loop, which would reset the variable when a light is finished evaluating, would work:

...

renderstate("light:name", lightName);
arrLen = arraylength(lightNameList);
if ( arrLen != 0 && lightName != lightNameList[arrLen-1] ) {
    sampleCount = 0;
    myOutputVar = 0;
    lightNameList = string(array());
}

// Do some stuff with myOutputVar

push(lightNameList, lightName);

But the same data, the end result for all lights, still gets written to each light's plane.

Has anyone gotten something like this to work, or is there some internal limitation which is cramping my style?

Edited December 12, 2009 by mrice