All of the Supplemental Draft EIS (SDEIS) alternatives followed the existing alignments with variations that shifted that alignment to the north or to the south each preserving different existing business and 4f properties. A visual simulation was made at Filmore Street to illustrate the differences between the various alternatives at a typical residential location.
POITRA photographers made a corridor photo survey from which all the base photographs were selected by the Engineer.
POITRA modelers created an accurate 3D model of the northern shift viaduct, the southern shift viaduct and the partial cover alternative which placed I-70 below grade. POITRA principal's design experience ensured accurate models. These models were then camera matched with the base photograph. Artists could then determine what areas of the background would need to be restored, removed or separated from the background.
A surprizing percentage of the work on this type of simulation occurs when restoring background elements as foreground elements are removed. Unfortunately all that work usually represents a comparatively small area of the overall simulation. ”
M.P., POITRA Visual
Visual Simulations Project Manager
The existing viaduct and several residence and many trees were to be removed from the path of the new viaduct. Each alternative affected a different set of residences and trees.
In the simulation view these removals would exposed several of the remaining residences beyond. POITRA artists carefully reproduced these newly exposed buildings as they removed the appropriate foreground buildings for each alternative. This work was accomplished using traditional digital painting techniques. The 3D model was then lighted to match the photograph, rendered and combined with it to create the final simulation.
Special effort was required to bring the bare foreground trees to the front of the new viaduct and to correctly depict the newly exposed neighborhood behind.
POITRA displayed the simulations on the I-70 East EIS public website at the request of the Engineer. The finished simulations were also used by CDOT in the I-70 East EIS public meetings, newsletters and as exhibits in the SDEIS Document.