A design visualization that could be used to evaluate bridge structure and retaining wall configurations was needed. A photosimulation was selected as the most medium most suited to the task.
POITRA photographers made a photographic survey of the area with these goals in mind. The Engineer selected a view which would best describe the various bridge span configurations and their impacts on the view seen by the traveling public as the base photograph.
Poitra Visual's illustrations of bridges, catenary systems, additional railroad track and sound walls reassured the public that this new transit service could be an attractive addition to their communities.”
K.P., P.E. URS Corp
North Metro Project Manager
POITRA artists prepared the base photograph to recieve the new structure using traditional digital painting techniques. This included separating foreground trees and signage from background trees and buildings. The existing at grade crossing signals were removed.
POITRA then created a 3D site model that included the main span steel through girder bridge structure set on two separate alignments with one alternative continuing on concrete viaduct. The model also contained the full EMU catenary system. The final model included an underpass alternative. Past bridge and wall design experience of POITRA principals made it possible to fill in the details lacking in the very conceptual bridge and MSE (Mechanically Stabilized Earth) wall plans.
The site model was then aligned and lighted to match the photograph. Each different span and wall configuration and the underpass alternative was rendered and composited with the base photograph to create the visual simulations.
A version of each alternative was created with a consist of the POITRA model EMU vehicles on the bridge so that the visual impacts could be studied with and without vehicles.
POITRA graphic artists set the simulations into a display board layout to be printed for use in FasTracks public meetings.
The finished simulations were also used on the project website, in newsletters and in the EIS document.