Reference

• ClearAdjoinFlags
• ClearFaceType
• ClearSurfaceFlags
• GetAdjoinFlags
• GetFaceGeoMode
• GetFaceLightMode
• GetFaceTexMode
• GetFaceType
• GetNumSurfaceVertices
• GetSurfaceAdjoin
• GetSurfaceCenter
• GetSurfaceFlags
• GetSurfaceLight
• GetSurfaceMat
• GetSurfaceNormal
• GetSurfaceSector
• GetSurfaceVertexPos
• SetAdjoinFlags
• SetFaceGeoMode
• SetFaceLightMode
• SetFaceTexMode
• SetFaceType
• SetSurfaceFlags
• SetSurfaceLight
• SetSurfaceMat
• SurfaceCenter
• SurfaceLight

Notes:

Surface Light is an "Extra Light" that is applied to surfaces. Even if the surface has no light of its own, you will still see it by the light of sector or vertex lights. Strangely, some surfaces do not accept extra light either from the level or from SetSurfaceLight().