I remember an article that provided a color map of rgb three primary colors, and then set the texture according to the position of the color map. Now I can't find it. Does anyone know this article?

Questions
1

I remember an article that provided a color map of rgb three primary colors, and then set the texture according to the position of the color map. Now I can’t find it. Does anyone know this article?

2

I can not remember from your description, do you remember a bit more about it ?

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thank you very much!!!