Demoscene Passivist wrote

>if all of them are still valid, or there is a new method that is not listed there

Yep they are all still valid, but I would suggest going for "render each primitive in an unique color" as its the most performant way todo reliable picking. U can simply do it with a FBO and a multiple-rendertarget fragment-shader.

Bug if u have to support very very old hardware then "selection render mode" maybe the way to go ... just my 2 cents