SS3 - Draping raster to terrain model


I am trying to drape an image to an SS3 terrain model. I am using the workshop files for "OpenRoads Quickstart - Roadway Modeling".

The raster is named MeadowPark.tif
The CAD file I am using for testing is "North St.-Corridor-Metric.dgn"
I have assigned dcdrape to the terrain triangles in our dgnlib. When I drape the raster to the referenced terrain model, the raster is scaled approx. 50% and repeated in X and Y directions. To achieve draping, the symbology for my terrain model is overridden to existing_triangles. 

Any ideas on how to solve this?

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