Populate points according to colored mesh

Hello
you already asked a similar question.

I think you like complexity so you don’t manage to make what you want. I am not used with solar radiation but I think the output is not a Color but a value in an interval. The gradient representation is just a way to represent the radiation, temperature or whatever. So why not outputting a single value represented by a grey value !!! The grey is far simplier to use.

Script in first discussion