Hello - If you have a curve on a mesh, it will be a polyline. If the mesh is not too heavily ‘curved’ in the distance to be offset, you can make, probably, a reasonable approximation by converting the stating polyline to a smooth curve (CurveThroughPolyline then making a pipe of offset distance in radius from that. Mesh the pipe surfac. Last, and MeshIntersect the pipe and the mesh. This might all work better in the V7/WIP since the mesh intersection code has been greatly improved.