When the project starts, you can draw a map in 2D. In this mode, you can press X to toggle delete mode, to remove lines. You can press L to toggle light mode to place lights (you need these). When you are ready, press Space to enter play mode.
GUYS I MADE RAY TRACING YOU NEED TO USE TURBOWARP YOUR COMPUTER WILL CRY: https://turbowarp.org/1190512580