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Be amazed at what I don't know
1. In HL2, are ground nodes just for single player? I assumed they are just for the computer characters to run around using. The SDK example has ground nodes everywhere, but I noticed other entities they didn't bother to delete from the SP map too.
2. How do you create fog in your level so it matches up with fog in the 3D skybox? I tried a separate fog controller in the skybox with a sixteenth the distances, but I just got super thick fog in my level with none in the skybox.