Available with 3D Analyst license.
You can use the Cut Polygons tool on the 3D Editor toolbar to split a polygon and create one or more new features.
Make sure you cut completely across the selected polygon feature, because otherwise the cut operation will not be successful. Edge snapping can help make sure that you cut across the polygon. For example, when trying to cut a polygon feature that has been extruded, edge snapping in 3D simplifies the cut by exactly digitizing the line segment to the edges of each wall.
Features with z-values maintain those values when the polygon is split. Newly created vertices are interpolated from the surrounding vertices defined in the feature and do not drop to the ground or have a height of zero.
- Begin an edit session and click the Edit Placement button .
- Click the Cut Polygons button on the 3D Editor toolbar.
- Click once to start digitizing the line sketch for cutting the polygon.
- Cut completely across the selected polygon feature.
- Double-click the end of the segment to finish the line sketch.
The polygon is split where the line crosses it. Using the Edit Placement tool , deselect the polygon feature and click inside it to select the newly divided areas, confirming the split.