Autocaulk

Tools > Autocaulk

Scans all brush faces; any faces that are obscured by other faces are textured with textures/nodraw so they are not rendered

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Fio shares the concept of nodraw from quake/source implementations

Consider a room made from 6 brushes (walls, floor and ceiling) :
The following faces are always invisible to the player:

• the "outside" faces of the walls
• the top face of the ceiling (because the bottom face of the ceiling brush is "the ceiling")
• the bottom face of the floor (because the top face of the floor brush is "the floor")

in this case it makes sense to apply the nodraw texture to the above 6 faces to would prevent them from being rendered.