How do you get faces coordinates?

Question

JavaFX

Hey!
Can anyone explain to me in a purely brotherly way how the Basurmans get the coordinates of the faces?
I don't have any ideas. The text in English did not give me anything, it reminds me of a meme how to draw an owl.

float[] points =
{  
    50, 0, 0,  // v0 (iv0 = 0)
    45, 10, 0, // v1 (iv1 = 1)
    55, 10, 0  // v2 (iv2 = 2)
};
float[] texCoords =
{  
    0.5f, 0.5f, // t0 (it0 = 0)
    0.0f, 1.0f, // t1 (it1 = 1)
    1.0f, 1.0f  // t2 (it2 = 2)
};
int[] faces =
{
    0, 0, 2, 2, 1, 1, // iv0, it0, iv2, it2, iv1, it1 (front face)
    0, 0, 1, 1, 2, 2  // iv0, it0, iv1, it1, iv2, it2 back face
};

Answer 1

And what is not clear here, even the comments explain everything. And in the original source , everything is there with pictures.