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In the context of circulation design for large buildings (e.g. hospitals, airports), the question of sensitivity of the path network against congestions and blockages naturally arises. To date, the answer to this question would require planners to use a simulation package, which is, however, almost never done in the early stages of building design. We therefore propose a novel visual planning tool that enables architects to estimate the impact of disturbances on the building circulation without having to use a simulation package. Our approach is integrated into a common CAD system and visualizes changes in the path-time relationship of adjacent functional areas under the effects of impeded accessibility.

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