How to Crop a Point Cloud in AutoCAD

Quick answer

AutoCAD provides rectangular, circular and polygonal point-cloud crops, but the native workflow is designed for quick manual input. PCCTools keeps these familiar crop shapes while allowing you to zoom during boundary creation, select existing polygon geometry and choose between quick and configurable commands.

Basic crops are projected through the cloud along the current view direction. Set the intended plan, elevation or side view before starting, then inspect the result from another angle.

Limitations of native AutoCAD cropping

Native cropping is adequate for a fast one-off isolation, but it becomes restrictive when the crop boundary needs careful placement or must follow existing CAD geometry.

You cannot zoom while defining the crop. The view must be prepared before the command starts. If a corner or scan detail is difficult to see, you must cancel, change the view and begin again.
You cannot select an existing polygon as the crop boundary. Even when a closed polyline already describes the exact room, parcel or work area, the native boundary must be picked again manually.
AutoCAD cannot crop a locked point cloud. You must unlock the cloud before using the native crop commands. While it is unlocked, an accidental selection, grip edit or move command can shift the entire cloud and compromise the alignment of the drawing.
The workflow is manual and quick-oriented. Rectangle corners, circle size and polygon vertices are entered during the command with little opportunity to reuse carefully drafted geometry.
The result depends on the current view. A 2D boundary is projected through the point cloud, so an incorrect view can retain or remove the wrong depth of points.
Repeating an exact crop is difficult. Redrawing the boundary later can introduce small differences.

Video placeholder 01Native AutoCAD crop limitationsShow a crop being cancelled because zoom is unavailable, then show an existing closed polyline that cannot be selected as the native boundary.

How PCCTools improves basic crops

PCCTools keeps rectangle, circle and polygon cropping intentionally fast while removing the restrictions that make precise native cropping awkward.

Zoom and pan during crop input: move closer to corners, scan edges and small details without cancelling the command.
Select existing geometry: use an existing closed polyline for a polygon crop instead of tracing it again.
Crop while the cloud remains locked: protect its insertion point and orientation while defining or adjusting the crop.
Quick commands: apply the common keep-inside result with minimal prompts.
Full commands: access additional choices, including inside or outside polygon cropping.
Extra slice commands: create narrow bands along drawing axes or parallel to a selected direction.

Recommended practice: keep production point clouds locked whenever possible. A small accidental displacement can invalidate traced geometry, sections and measurements throughout the drawing.

Rectangular crop

A rectangular crop is the fastest choice for rooms, facade areas, drawing zones and other simple work regions.

Set a view perpendicular to the area you want to isolate.
Run QPCRCROP for a quick inside crop or PCRCROP for the full command.
Pick the two rectangle corners. Zoom or pan during input when a corner needs more accurate placement.
Inspect the projected result in an isometric view.

Image placeholder 01Rectangular crop around one roomShow the two picked corners and the final isolated room scan.

Circular crop

A circular crop suits tanks, columns, round structures and compact features where a rectangle would retain unnecessary surrounding points.

Run QPCCCROP for a quick crop or PCCCROP for the full command.
Pick the centre and define the radius, zooming when the scan edge requires closer inspection.
Check the projected result from another view.

Image placeholder 02Circular crop around a tank or columnShow the boundary in plan and the resulting projected crop in an isometric view.

Polygonal crop

A polygon crop handles irregular footprints, angled rooms and areas already defined by project geometry.

Run QPCPOLYCROP for a quick inside crop or PCPOLYCROP for inside/outside options.
Draw the polygon point by point with the live preview, zooming whenever a vertex requires precise placement.
Alternatively, choose Select and pick an existing closed polyline.
With the full command, choose whether to retain the points inside or outside the polygon.

Main productivity gain: a survey boundary, room outline or previously drafted closed polyline can become the crop directly. It does not need to be traced again.

Video placeholder 02Draw a polygon with zoom, then crop from an existing polylinePresent both PCCTools workflows so the improvement over native AutoCAD is clear.

Axis and parallel slices

PCCTools extends the basic crop set with thin slice commands for quick plans, elevations and inspection bands.

PCXSLICE creates a thin band along the X axis.
PCYSLICE creates a thin band along the Y axis.
PCXYSLICE creates a horizontal plan slab.
PCPARSLICE creates a band parallel to a chosen direction.

Use these commands for temporary slices. Use the dedicated section tools when the cut must be named, managed, stepped or associated with a section UCS.

Image placeholder 03X, Y, horizontal and parallel slice comparisonUse one scan and label the direction of each retained band.

Advanced crops

When a projected rectangle, circle or polygon is not enough, use the advanced crop tools. They provide editable 3D box geometry, spherical isolation and corridor buffers that follow lines or polylines.

How to crop a point cloudin AutoCAD