https://communities.bentley.com/products/road___site_design/f/geopak-inroads-mx-openroads-forum/110318/delta-terrain-model-crashingI have been attempting to create a Delta Terrain Model from two existing surfaces. It crashes every time. I&#39;ve gone through most of the exception log, but since I don&#39;t know exactly what I&#39;m looking for this hasn&#39;t been very helpful. Are there any &quot;standarden-USTelligent Community 12https://communities.bentley.com/thread/336420?ContentTypeID=1Mon, 31 Aug 2015 18:11:54 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:7a9c2d2a-f486-45ea-aa2f-e924e4420673Frank BostonOK, great. I didn&#39;t try that. Any idea what was the issue?<div style="clear:both;"></div>https://communities.bentley.com/thread/336357?ContentTypeID=1Mon, 31 Aug 2015 13:08:26 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:4f1afbd5-e30f-4df3-8b1b-c4180b2108d4Beebe Ray<p><a href="https://communities.bentley.com/cfs-file/__key/communityserver-discussions-components-files/5922/Merge-Terrain-Model.dgn">communities.bentley.com/.../Merge-Terrain-Model.dgn</a>I was able to reproduce the crash with your DGN file so I created a new DGN and exported the two surfaces from your DGN to GEOPAK TIN files and then imported those TIN files into my new DGN. I then was able to merge the terrains in my new DGN file just fine.</p><div style="clear:both;"></div>https://communities.bentley.com/thread/336223?ContentTypeID=1Fri, 28 Aug 2015 17:38:08 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:555c63a3-ae96-4830-a906-2d726192b589Frank Boston<p>Here&#39;s the current DGN. &nbsp;</p> <p><a href="https://communities.bentley.com/cfs-file/__key/communityserver-discussions-components-files/5922/JN107575AA-DTM-_2D00_-ANALYSIS.dgn">communities.bentley.com/.../JN107575AA-DTM-_2D00_-ANALYSIS.dgn</a></p><div style="clear:both;"></div>https://communities.bentley.com/thread/336182?ContentTypeID=1Fri, 28 Aug 2015 12:31:11 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:14b9f333-74c4-4b9f-8e8d-ff53c32ae9b0Beebe RayPlease post your files<div style="clear:both;"></div>