The lightmapped shaders imply baked lighting, but aren’t bumpmaps and specular maps only useful when lit dynamically? Are people using a combination of the two? Are there any caveats to using both? It merely strikes me as weird that they would be used together.
The lightmap is whatever illumination “there is already”. The lightmap part does not get bumpmapped.
Any other lights add on top of the lightmap. So if you have a rocket flying and it has a point light attached, it will just illuminate on top of the lightmap.
The usual trick is to disable some lights on the lightmapped objects. For example, in FPS tutorial there’s a directional light that does not affect the lightmapped level, but does affect all characters, crates, turrets etc.
Intriguing. Thanks for the answer!