Thanks for sharing, but I don't get it. What is this third color? Sure, it is the color, that fills the gap in bi-directional lighting and can be used in an artistic way.

For an outdoor environment it is also clear that the color 1 is the sun and color 2 the ambient, but what is color 3 then???

And: how does this relate to multiple light sources in indoor scenes?

Although it is simple, it slightly confuses me