Thoughts on making Cycles into a spectral renderer

A massive thank you to @pembem22 for submitting a PR enabling spectral data transfer between nodes, and converting the Blackbody to output spectral data. This is a huge milestone. Hopefully some sort of custom spectrum input method will be coming soon, that’s where we’ll start to see the biggest differences, but already this is quite a stark difference. Images by @pembem22 from the PR.

Master
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Spectral ‘RGB Blackbody’
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Spectral Blackbody
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