Ps.
I have more than one vertex for each coord x,y,z because each vertex can have different normals or text coord for each coord , then i can have:
Vertex 1: x:10 y:5 z:0 U:0,2 V 0,4
and
Vertex 2: x:10 y:5 z:0 U:0,4 V 0,67
in this case i have created two or more vertex with each coord.
Is correct or completely wrong?
and ...