The Witcher (computer game) was created using the BioWare Aurora Engine. © 1997-2004 BioWare Corp. The BioWare Aurora Engine has been rewritten (around 80%) to utilise the latest version of DirectX 9. The new engine's main feature is a brand new rendering system responsible for realistic visuals. Vertex and pixel shaders have been implemented, allowing magical swords to glow subtly in the dark, as well as the eyes of some creatures. These shaders have also allowed for the implementation of numerous stunning full-screen effects, like the Witcher's night vision.