EVA is a computer architecture that contains pre-processed visual information about the environment which agents access via a lookup table. In space syntax, the lookup table encodes not only object locations, but also information about the accessibility structure of the environment.
EVA (exosomatic visual architecture)
Penn, A. & Turner, A. (2001) Space syntax based agent simulation. In: (Proceedings) 1st International Conference on Pedestrian and Evacuation Dynamics. : University of Duisburg, Germany,1-16. pp.1