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I have created a polyline/GIS Line that I would like to drape on a mesh. In Leapfrog, GIS lines automatically drape onto a topography, but there may be instances where you would like to drape a GIS line or polyline onto a specific mesh (non-topographic surface).

Unfortunately, there isn’t a direct way to drape polyline/ GIS data you have created in Leapfrog onto a specific mesh in Leapfrog. However, there are two workarounds that can help you as explained below.

For both workarounds, if you have created a polyline in the polyline folder, you will need to extract the GIS Line by right-clicking on it in the polyline folder and selecting “Extract GIS Line”. At this point, your polylines will appear in the GIS Data folder. For Polylines and GIS lines created in Leapfrog, you can right-click and select ‘Set Elevation, however only a fixed elevation available as an input. Imported GIS lines, have additional options that also include using attributes and meshes to update the elevation.

First workaround: turn the created polyline into a GIS object

1.    Export the newly created GIS line as a GIS Object:

This will create a shp file.

2.    Import your GIS object back in Leapfrog through the GIS Data, Maps and Photos folder: then you should be able to set the elevation of your line.

Second workaround: setting the mesh as the topography:

1.    Set the desired mesh as the topography. (Note. Changing the topography will impact downstream geological and numeric models. To avoid this, you could also do this process in another blank Leapfrog project.)
2.    When you have created the GIS line, there should be a copy of it in the ‘Draped GIS Objects’ folder. Leapfrog will have automatically draped the GIS line onto the Topography. You can drag it into the scene to view.
3.    Once you have draped it on the mesh, extract the polyline from the ‘Draped GIS Objects’ folder (right-click on the GIS data and select “extract polyline”). This will now appear in the Polylines folder and should be set to the desired mesh “elevation”.
If you had set your mesh as the topography, you can then set the real topography surface back.

Note: For GIS lines that have been imported in the GIS folder, you can drape them onto a mesh or set their elevation.

Note: Once a polyline/GIS line has been exported and re-imported, it is no longer directly editable as a GIS object.

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