Suppose I declare a colour_map. Is there a way to read a colour out of the
map? In other words, is there a way I can feed in a nindex value and find
the corresponding colour?

The docs say I can fetch the colour of a point out of a texture, but what
I'm asking for is one step simpler than that... Any ideas folks?

Andrew.

PS. Yes, I *know* it's possible to do the linear interpolation manually, but
it's a pain to keep typing this stuff...

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