quad = new CustomVertex.PositionTextured [ 4 ];

quad [ 0 ] = new CustomVertex.PositionTextured ( -1.0f, -1.0f, 0.0f, 0.0f, 1.0f );
quad [ 1 ] = new CustomVertex.PositionTextured ( -1.0f, 1.0f, 0.0f, 0.0f, 0.0f );
quad [ 2 ] = new CustomVertex.PositionTextured ( 1.0f, -1.0f, 0.0f, 1.0f, 1.0f );
quad [ 3 ] = new CustomVertex.PositionTextured ( 1.0f, 1.0f, 0.0f, 1.0f, 0.0f );