There is a short and relatively simple paper here describing a method for antialiasing normal maps.
Whether you are very familiar with normal maps or not may not be important.
The part that I am having trouble with, is constructing the lookup table that they have described.
They provide a formula:
$\newcommand{\abs}[1]{\lvert#1\rvert}$ $f_t = \frac{1}{1 + s \sigma^2} = \frac{\abs{N_a}}{\abs{N_a} + s(1 - \abs{N_a})}$
And the following expression from which the table is to be constructed:
$\frac{1 + f_t s}{1 + s}\left( \frac{N_a \cdot H}{\abs{N_a}} \right)^{f_t s}$
The table is then to be expressed in terms of $N_a \cdot H$ and $N_a \cdot N_a$.
Does anyone understand what values the table should contain, so that it may be accessed with coordinates of the form $(N_a \cdot H, N_a \cdot N_a)$?