Accessibility typically has been applied to urban or transportation problems two
dimensionally. However, in large complex buildings as shopping centers or hospitals, inter-
spatial accessibility among compartments has to be taken into account such as in building
layouts or evacuation planning. This study expands space syntax theory, one of accessibility-
related methodologies used for computing connectivity in urban or architectural spaces, into
3D indoor spaces. Although space syntax is basically a topology-based theory that does not …