Re: Light Leaks using extruded splines
that doesn't look like light leaking to me, more like you are smoothing over too few photon samples. i would say you should be testing your GI with no fewer than 1000 photons from the sun, upping it to anywhere up to 100k to 250k when optimised with some FG.
i am slightly confused by a few of the things you have described - firstly, you say that you fire 2 photons into your scene, this should just give you a few bright photon samples depending on bounces? changing the sampling radius at point 4 seems a little pointless as you dont have enough samples to begin with?
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