@article{Preppernau_2020, title={Normalizing the Normal Map}, url={https://cartographicperspectives.org/index.php/journal/article/view/1669}, DOI={10.14714/CP96.1669}, number={96}, journal={Cartographic Perspectives}, author={Preppernau, Charles}, year={2020}, month={Nov.}, pages={61–74} }