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Generating cross-track slope shader

RobsterRobster Posts: 8
in Elevation Data
Hello brainy people

I have a DTM loaded in Global Mapper representing the seabed, together with a polyline along it representing a subsea cable.  I'd like to shade the DTM based on the cross-slope value (i.e. the slope perpendicular to the cable).  I've absolutely no idea how to do this.  Can anybody help???

Many thanks

Rob
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