The November 2025 Update is now live.
This update adds new water rendering features from newer Source Engine games to Garry's Mod. Here's a comparison:
This includes flow maps, lightmaps and ability to reflect 3D skybox. This both improves compatibility with mountable games, as well as enables map makers to use these new features in their maps.
It must be noted that these changes may unexpectedly affect a small amount of existing maps. The issue here is that some map makers are using (modified) water materials from other Source Engine games which have parameters that did not previously work, but do work correctly now, causing unexpected changes in water appearance. This is unfortunately unavoidable from our end, and will need to be individually fixed by map makers by editing their water materials. No map recompilation needed.
