#2847 Add a fall back dominant direction (0, -1, 0) if the path does not extrude in z-direction.

* This direction means Left will cause it to go -x and Right +x so that the directions are correct with respect to "Left" and "Right" when you look "North".

ApplicationCode/ReservoirDataModel/RigWellPathGeometryTools.cpp

@@ -139,5 +139,11 @@ cvf::Vec3d RigWellPathGeometryTools::estimateDominantDirectionInXYPlane(const st
         }
         directionSum += vec;
     }
+    
+    if (directionSum.length() < 1.0e-8)
+    {
+        directionSum = cvf::Vec3d(0, -1, 0);
+    }
+
     return directionSum.getNormalized();
 }