The MapNode field in the TraceResult struct represents the specific map node that was hit during a trace operation, if any. This field is part of the Editor namespace and is used to determine which part of the map was intersected by the trace.

To use the MapNode field, you typically perform a trace operation and then check the TraceResult to see if a map node was hit. If the trace was successful and a map node was hit, the MapNode field will contain a reference to the MapNode object that was intersected.

Example usage:

TraceResult result = PerformTrace();
if (result.Hit)
{
    Editor.MapDoc.MapNode hitNode = result.MapNode;
    if (hitNode != null)
    {
        // Process the hit map node
    }
}