This article relates to the game "Half-Life: Alyx". Click here for more information.
This article relates to the workshop tools for "Half-Life: Alyx". Click here for more information.
This article's documentation is for Source 2. Click here for more information.

Difference between revisions of "Half-Life: Alyx Workshop Tools/Level Design/Navigation Mesh"

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{{HLATools page|leveldesign=1}}
== Introduction ==
== Introduction ==
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Revision as of 21:44, 27 May 2020


This tutorial will teach you how to create a Navigation Mesh so NPCs can walk around by their own.


Create a test room with a couple walking NPCs of your choice. For this tutorial, I've added two npc_combine_s.

HLA SDK Navigation Mesh Img1.png

Click on the Navigation button 8. The Nav Mesh Editing panel should appear on the left side of the screen. Click Create Walkable Seed and drag a block into the first walking area you want to create. It should create a func_nav_markup mesh entity.

HLA SDK Navigation Mesh Img2.png

To generate the navmesh, the game will flood fill outwards from walkable seeds. You do not need to cover all walkable space in a walkable seed. There may be cases where the flood fill does not reach areas that you wish to be marked walkable. In this case, create more walkable seeds for those areas. Use the preview button to generate a navmesh and preview the navmesh to confirm that all areas that NPCs can go are marked as walkable.

Finishing up

Compile your map, the navmesh will be generated and added to your map ingame automatically. You can visualise the navmesh in-game use the command nav_edit 1. In Hammer it is possivble to hide nav markup entities in the auto visgroups in if they get in the way when working on other parts of your map.

The basic_setup template contains an example of a walkable seed.

HLA SDK Navigation Mesh Img4.png