Jedi engine

From XLEngine.com

The Jedi engine was developed by Lucas Arts. It is a 2.5D sector-based engine used in Dark Forces and Outlaws. A unique trait of the Jedi engine is that it supports 3D models (internally called VUEs) through the integration of a second renderer. Most of the game is rendered with the 2.5D engine, but a more powerful true 3D engine is also present and used to render models such as Kyle's ship the Moldy Crow. This hybrid setup allowed to provide adequate performances on the hardware of the era while still allowing effects impossible for other similar engines such as id Tech 1 (also known as Doom engine) or Build.