In Civil 3D, creating surface boundaries is essential for controlling the extent of your surface and removing unwanted areas. 🎯 Steps to Create Surface Boundaries in Civil 3D: Step 1: Open Surface Properties Go to the Toolspace panel. Under the Prospector Tab, expand Surfaces. Select the surface you want to edit (e.g., Existing Ground). Step 2: Access Surface Definition Right-click on the surface and select "Edit Surface Style". In the Definition tab, find the Boundaries option. Step 3: Add a New Boundary Right-click on Boundaries and select Add.... In the Add Boundaries Dialog Box: Name the boundary (e.g., Outer Boundary). Set Type to Outer, Show or Hide. For cutting inside areas, use the Hide boundary option. Click OK. Step 4: Select the Boundary Select the Polyline or feature line that defines your boundary. Press Enter. ✅ Surface Updates Automatically Your surface will update, trimming areas outside the boundary. 🌟 Pro Tips: For multiple boundaries, add Inner Boundaries or Data Clip Boundaries. Use Hide Boundaries to exclude unwanted areas like ponds or buildings.
