I used the tool "add surface information" to interpolate z-values from a DEM to manually-drawn polylines.
1) Adding surface information seemed to work fine, but I'm not sure how to check?
Next, I ran the "near 3D" tool to calculate 3D distance from points to these polylines. However, when I opened the attribute table of my input feature, new attributes were added, but the fields were populated with all "0" values.
2) What might have gone wrong to populate distance values with all "0" values? The tool said that it ran without error.