function draw_mesh(x, y){
    let bitmask = cells[y][x]; // The case bitmask

    // Cell vectors
    let a = createVector(x * REZ, y * REZ);
    let b = createVector(a.x + REZ, a.y);
    let c = createVector(b.x, b.y + REZ);
    let d = createVector(a.x, c.y);

    //Line positions
    let top = p5.Vector.lerp(a, b, 0.5);
    let bottom = p5.Vector.lerp(c, d, 0.5);
    let left = p5.Vector.lerp(a, d, 0.5);
    let right = p5.Vector.lerp(b, c, 0.5);

    push();
    switch(bitmask){
        case 0:
        case 15:
            break;
        case 1:
        case 14:
            vLine(bottom, left);
            break;
        case 2:
        case 13:
            vLine(bottom, right);
            break;
        case 3:
        case 12:
            vLine(left, right);
            break;
        case 4:
        case 11:
            vLine(right, top);
            break;
        case 5:  //-------------Special cases ------------
            vLine(left, bottom);
            vLine(top, right);
        case 10:
            vLine(bottom, left);
            vLine(right, top);
            // ---------------------------------------------
            break;
        case 6:
        case 9:
            vLine(top, bottom);
            break;
        case 7:
        case 8:
            vLine(left, top);
            break;
        default:
            throw "Bad bitmask value.  BAD.";
    }
    pop();
}