Is the calculation of Bottom and Top Plane w correct?

[Seungjun80]

Is the calculation of Bottom and Top Plane w correct?

I think..

line 230 in Frustum.java w = m.m44 + m.m23; => w = m.m44 + m.m24;

line 238 in Frustum.java w = m.m44 - m.m23; => w = m.m44 - m.m24; l Is right??

    // Right Plane = row 4 - row 1:
    x = m.m41 - m.m11;
    y = m.m42 - m.m12;
    z = m.m43 - m.m13;
    w = m.m44 - m.m14;
    d = Math.sqrt(x * x + y * y + z * z); // for normalizing the coordinates
    Plane right = new Plane(x / d, y / d, z / d, w / d);

    // Bottom Plane = row 4 + row 2:
    x = m.m41 + m.m21;
    y = m.m42 + m.m22;
    z = m.m43 + m.m23;
    w = m.m44 + m.m23;
    d = Math.sqrt(x * x + y * y + z * z); // for normalizing the coordinates
    Plane bottom = new Plane(x / d, y / d, z / d, w / d);

    // Top Plane = row 4 - row 2:
    x = m.m41 - m.m21;
    y = m.m42 - m.m22;
    z = m.m43 - m.m23;
    w = m.m44 - m.m23;
    d = Math.sqrt(x * x + y * y + z * z); // for normalizing the coordinates
    Plane top = new Plane(x / d, y / d, z / d, w / d);