  Pixel art is a popular artistic style adopted in the gaming industry, and
nowadays, it is often accompanied by modern rendering techniques. One example
is dynamic lighting for the game sprites, for which normal mapping defines how
the light interacts with the material represented by each pixel. Although there
are different methods to generate normal maps for 3D games, applying them for
pixel art may not yield correct results due to the style specificities.
Therefore, this work compiles different normal map generation methods and study
their applicability for pixel art, reducing the scarcity of existing material
on the techniques and contributing to a qualitative analysis of the behavior of
these methods in different case studies.
