Game previewing includes level streaming, and the World Outliner will update accordingly so that you can select and edit Actors that are streamed in as a result of gameplay.Īny Actors you have selected when you begin testing your game with a Play In Editor or Simulate In Editor session will remain selected. This duplication of the level keeps the editor's copy of the world safely immutable.
Changes can be saved back to the editor copy of the level using Keep Simulation Changes. When you launch a game preview session, the editor quickly creates a duplicate copy of your level. The in-editor preview system supports toggling between Play In Editor and Simulate In Editor sessions, so that you can quickly iterate on gameplay and asset tweaksĪnd see how your game changes as a result. There are two preview types available: Play In Editor (PIE) which is directly accessed via the Play button located on the Main ToolbarĪnd Simulate In Editor (SIE) which is accessed via the Play dropdown menu ( Alt+S). Unreal Editor allows you to spawn a player anywhere and instantly preview your game from within the editor without waiting for files to save.
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