private float[] meshPoints = {
        -5, 5, 0, // left down
        -5, -5, 0, // left up
        5, 5, 0, // right down
        5, -5, 0 // right up
};
public float[] textureCoords = {
        1, 1,
        1, 0,
        0, 1,
        0, 0
};
private int[] faces = {
        2, 2, 1, 1, 0, 0, // triangle #1
        2, 2, 3, 3, 1, 1  // triangle #2
};

mesh.getPoints().setAll(meshPoints);
mesh.getTexCoords().setAll(textureCoords);
mesh.getFaces().setAll(faces);