TangoARScreen._Frustum C# (CSharp) Method

    private static Matrix4x4 _Frustum(float left, float right, float bottom, float top, float zNear, float zFar)
    {
        Matrix4x4 m = new Matrix4x4();
        m.SetRow(0, new Vector4(2.0f * zNear / (right - left), 0.0f,                          (right + left) / (right - left) , 0.0f));
        m.SetRow(1, new Vector4(0.0f,                          2.0f * zNear / (top - bottom), (top + bottom) / (top - bottom) , 0.0f));
        m.SetRow(2, new Vector4(0.0f,                          0.0f,                          -(zFar + zNear) / (zFar - zNear), -(2 * zFar * zNear) / (zFar - zNear)));
        m.SetRow(3, new Vector4(0.0f,                          0.0f,                          -1.0f,                            0.0f));
        return m;
    }