Hi Mike, Haven't time yet to check your TIN yet but if what you want to do is clip out the terrain where a road is passing you could try the Mask capability in the Reality Mesh manager dialog (work but only for mask with limited amount of vertices). The real solution would probably be to integrate the clipping solution we create for OpenRoads ConceptStation (which would mask automatically the corridor where a road is passing) but this is not yet available in Descartes or MicroStation based Civil products. HTH, Mathieu
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