Add Conflict Resolution Options When Pasting One Surface into Another

[andrew.schroeder]

Please add conflict resolution options when pasting one Civil 3D surface into another.

At present, when Surface 2 is pasted into Surface 1, the pasted surface simply takes precedence wherever the two overlap. There is no option to control how overlapping elevations are resolved, which can limit usability and create avoidable workarounds/rework.

Proposed Improvement

When a surface is pasted into another surface, Civil 3D should prompt the user to choose one of the following options:

Option:	Behaviour:
None	Maintains current behaviour
Keep Highest	Uses the higher elevation where the two surfaces overlap
Keep Lowest	Uses the lower elevation where the two surfaces overlap

The default should be None, so existing workflows remain unchanged unless the user chooses otherwise.

Why This Would Help

This would be extremely useful in workflows involving:

• existing ground and design surface comparisons
• temporary and permanent surfaces
• construction staging
• earthworks modelling
• merging multiple source surfaces
• resolving overlapping terrain conditions without manual editing

In many practical cases, users do not simply want the pasted surface to override everything. They want the resulting composite surface to reflect either the highest or lowest elevations in overlapping areas, depending on the design intent.

Additional Improvement: Automatic Intersection Breakline

To make this behaviour reliable, Civil 3D should also:

• detect the intersection between the two surfaces
• create a breakline along that boundary

This would help prevent unexpected triangulation across the overlap zone and produce a cleaner, more predictable result.

Benefit

This enhancement would:

• reduce manual surface editing
• improve control over pasted surface behaviour
• make composite surface creation more intelligent
• reduce triangulation errors near overlap boundaries
• better support real-world design and modelling workflows

This would be a very practical improvement for anyone working with complex surface models in Civil 3D, and I believe it would add significant value to future releases.