It's gonna be easy, because it's the same question than my last one,
but because of my delay I couldn't get the answer.
The first part : Here
The thing is that I don't understand the answer, who look like easy so I assume that It's my fault ^^
He has node who look empty, with no script or "object" attached.
That's more or less the point that I don't get.
So If any one can help me …