well i'm not sure what your using HL, Quake, Quake2 etc...
generally the BSP compilers come in 3 flavours,
qBSP3.exe - Compiles the Geometry
qRad3.exe - Compiles the Lightmaps
qVis.exe - Compiles the BSP Visibility
(HL requires CSG.exe to be run first to make sure the geo is oki for the Engine)
sometimes qRad is also called Light or something, but it does the same thing... it should be a selectable option when you compile - but i'm just saying these are the files you require to achieve it
Tsu'va Oni Ni Jyuuko Fiori Sei Tau!
One block follows the suit ... the whole suit of blocks is the path ... what have you found?