The problem: Coloring the chairs like the image layout provided. The chairs were provided as mesh, but they had no pivot points or orientation. The number of chairs were around 65.000.

This was the color map provided. I color coded the image like the one on the right for easier sorting:

The position and orientation of the chairs were extracted from the provided meshes to locators via script, they were then sorted in colored layers:

The colored locators were replaced by chair objects with the right colored shaders aplied