The basics of Caulk Hulls (in Radiant)
Caulk Hulls area a useful tool to optimise a compiled level because they help reduce the amount of data generated when the *.map is parsed. Essentially comprising two parts the visible elements of a level the player can see are surrounded by a 'hull' that both encase the structure and seal it from the void (else the level would leak). To create a Caulk Hull simply draw out a series a form-fitting brush volumes, textured in "caulk", around everything and then 'flag' the internals as "Detail
" volumes ("Ctrl+M
"). Once done (and assuming the level is fully sealed per design requirements) the map can be compiled and used.