Outdoor Point Cloud – Auto Plane Detection Overshoots Gable Shape. How Should I Edit the Roof Planes

juliette1699
juliette1699
in Point Clouds

I am working with an outdoor point cloud scanned by a Leica BLK, and I’m using BricsCAD BIM to generate planes manually.

Since the point cloud is outdoors and the roof edges are not well-defined, the auto-detected planes extend far beyond the actual gable triangle (see image). The generated planes do not match the real roof boundary, and the software does not automatically trim them to the gable shape.

image.png
image.png

What I already tried

  • I first attempted Scan-to-BIM → Convert to Solid, but the outdoor point cloud is too noisy, and the solids become unusable.
  • That’s why I switched to the panorama sphere selection (green bubble) workflow and manually clicked the planes.
  • This method works, but the resulting planes are always oversized and extend past the roof geometry.

My Question

Since the planes created from outdoor point clouds cannot match the roof’s gable boundaries automatically:

What is the recommended workflow to trim or edit these planes properly?

image.png

Additional Information

  • The roof planes need to be cut exactly along the gable triangle.
  • Automatic plane detection works, but lacks semantic understanding (e.g., identifying roof edges).
  • I want to know the correct or commonly accepted editing workflow after auto-detecting planes in outdoor scans.

What I’m looking for

✔ Best practices for editing oversized roof planes
✔ Whether I should convert them to surfaces and trim them manually
✔ Whether I should use boolean operations with vertical gable planes
✔ Or if there is a smarter or more efficient workflow used internationally

Any advice from users with outdoor Scan-to-BIM experience would be greatly appreciated!

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