Sky settings

[Lightning]

As for when you edit a shader, or edit geometry in 3ds max, you do need to recompile and relight.

You don't need to recompile and light if you are editing a shader. Actually, you don't even need to recompile at all.

If you map is not changing, all you need to do is adjust the sky tag and use the "Light" command. Make adjustments and light again, etc.