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 Vine Street to illustrate the different alternatives on the Purina Plant, an important local employer.
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 residences and the Purina Plant were to be removed from the path of one or more of the alternative alignments. Each alternative affected a different set of residences and other structures.
In the simulation view these removals would exposed buildings and truck trailer parking beyond. POITRA artists carefully reproduced these newly exposed scenes as they removed the appropriate foreground buildings and the old viaduct 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 viaduct and to correctly depict the newly exposed industrial scenes 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.