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Using LUA to script shaders for my render

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Hallo, I am working on a render project and would like to use LUA to script shaders for it. So far I have managed to read values from the lua scripts, but I am unsure about how to read arrays. Say I have the following function, how do I get the return value from it in the c++ part of my program? The return array will always have the size of 3 (final rgb output for the current pixel)
function f ()
t = { 1,1,2}
return t

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