Cutting Planes
Open a level.
Add Simplygon clipping plane visualizer.
Select Simplygon clipping plane visualizer. Add planes. Update parameters and click update.
Open World Settings tab Window / Stand-In Outliner.
Select static mesh actors in level editor.
Click Create in Stand-In Window.
In the settings panel for pipeline choose Far.
Modify Far pipeline settings.
Modify clipping geometry settings. Check Use Clipping Planes
Build Stand-In.
Finished Stand-In with clipped top and bottom.