True I guess, I never know if I should state the function or consequence. I think it's work to note that it will cause a crash if you try to get the colors for it. Maybe I am just nitpicking.

Perhaps we should describe the general idea, and then list after each type the "thing" (renderer, physics 'engine') that uses it and in what respect (ex, means it doesn't create geometry for it, it prevents entities from interesecting it).