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Clashes

Detect interferences between pairs of networks in one or more drawings — a pressure water network against a gravity sewer or structures, for example — and track each clash to resolution, including rebuilding the editable network so the clash is really gone.

Download the trial See pricing

The workflow

Seven windows, from drawings to a solved drawing

The same windows you see in the module's ribbon, in the order you use them. Clash Settings live inside Detect Clashes; there is no separate Settings window.

Inputs

Add LandXML, DXF or DWG drawings, then Scan / Extract Networks to find each network. LandXML and DXF are read without CAD; a Civil 3D DWG is read by Civil 3D's windowless engine.

Clash Matrix

Every pair of detected networks is one cell (A ↔ B is one pair). Enable the pairs to check, then Apply.

Detect Clashes

Set the minimum soft clearance, the search envelope, the reference network (stays) and the editable network (rebuilt), then run it. Hard clashes are classified horizontal or vertical.

Fix Clashes

Mark Clashes draws the clash clouds and keeps a before image; Fix All rebuilds the editable network — a pressure pipe becomes 3 pipes + 4 bends — until a clash is resolved.

Clash Manager

Filter All / Open / Resolved / Manual Review and read each clash's before and after image, fix method, attempts and validation result.

Dashboard

Total, resolved, remaining and the auto-fix rate.

Output

CSV and HTML reports, the DXF clash markup, one updated LandXML per network and a Civil 3D drawing holding both networks as native parts.

Each clash, resolved and evidenced

Hard and soft clashes, with hard ones split into horizontal and vertical.
Mark Clashes draws red, orange and green clouds and captures a before image.
A clash becomes Resolved only when the detector, re-run, no longer finds it.
Anything that cannot be rebuilt safely becomes Manual Review, with the reason.

Reports and a solved drawing

Clash_Report.csv and Clash_Report.html, plus the DXF clash markup.
One updated LandXML per network.
Clash_Solved_Networks.dwg: both networks as native Civil 3D parts, solved pipes and bends included, built silently from your original drawings.
Original handle IDs are kept; the export is blocked if ID validation fails.

Video

Watch clash detection on a real pair of networks

From drawings to a solved drawing

A recorded walk-through in English.

What you need

Windows	Windows 10 or 11, 64-bit
Civil 3D	Autodesk Civil 3D 2020–2027, to read a Civil 3D DWG and for the Civil 3D drawing in the output (native workflows validated on 2024 and 2027)
Your drawings	LandXML, DXF or DWG files with the networks to compare (two or more, for clashes)
Licence	Free 7-day trial licence, then a licence for your PC