question: public CCVertex3D originalVertex ( ccGridSize pos ) { int index = ( pos . x * ( gridSize_ . y + 1 ) + pos . y ) * 3 ; CCVertex3D vert = new CCVertex3D ( originalVertices . get ( index + 0 ) , originalVertices . get ( index + 1 ) , originalVertices . get ( index + 2 ) ) ; return vert ; }
target:  returns the original (non-transformed) vertex at a given position 