  Processes of urban planning, urban design and architecture are inherently
tangible, iterative and collaborative. Nevertheless, the majority of tools in
these fields offer virtual environments and single user experience. This paper
presents CityScopeAR: a computational-tangible mixed-reality platform designed
for collaborative urban design processes. It portrays the evolution of the tool
and presents an overview of the history and limitations of notable CAD and TUI
platforms. As well, it depicts the development of a distributed networking
system between TUIs and CityScopeAR, as a key in design collaboration. It
shares the potential advantage of broad and decentralized community-engagement
process using such tools. Finally, this paper demonstrates several real-world
tests and deployments of CityScopeAR and proposes a path to future integration
of AR/MR devices in urban design and public participation.
