RFR: 8234920: Add SpotLight to the selection of 3D light types [v14]

[Nir Lisker]

On Sat, 5 Jun 2021 17:27:13 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> So it looks like computeSpotlightFactor is the winner. Does that match your observations? It might be worth some further tuning.

Yes, on Ubuntu. On Win, `computeSpotlightFactor3` was the best for me. I detailed my findings in the topmost comment.

What further tuning are you thinking of?

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PR: https://git.openjdk.java.net/jfx/pull/334