How do Material Nodes get connected in GafferThree?

[juls_]

Hi,

I'm playing around with a custom lightfilter and would like to understand how connections are handled within a single Material on GafferThree nodes. The `Arnold HDRI Skydome Light` package for example creates a Material node with a `arnoldLightShader` (skydome) and an `arnoldSurfaceShader` (image). How does the skydome light know, that the output of the image node should be connected to the `color` input of the skydome?

In my lightfilter I would like to specify which parameter should take output of a subsequent `arnoldSurface` shader in the GafferThree.

Thanks,