Polygon Crop

Source file: crop-by-polygon.htm

Use Polygon Crop to crop objects such as lines, loops, point sets, edge networks and surfaces. This will perform 'cookie-cutting' of the selected objects.

1. Select the objects you wish to crop.

2. On the Home ribbon tab, go to the Crop group and select Polygon Crop.

   

3. Create or select a polygon to use as the cropping boundary. See 2D Polygon.

4. Drag the polygon into the Cutting polygon field. The projected polygon boundary is displayed in grey.

5. Select the Extrusion direction of the cropping action using one of the following options:

   • Two points: Define the direction by specifying two points.
   • Facet: Make the direction perpendicular to a selected facet.
   • Axis aligned: Define the direction by an axis of the view window.
   • Bearing and inclination: Define the direction by a bearing and inclination angles.
   • Action plane axis: Define the direction by an axis of the action plane.

   • Polygon best-fit plane normal: Define the direction as the normal to a plane-of-best-fit to a polygon.

   An extrusion of the polygon in the direction specified will appear.

6. Limit extruded polygon between two points limits the height and depth of the filter.

7. Choose the required Keep geometry option, whether to retain object fragments Inside or Outside the polygon.

8. Select Crop a copy to keep the original data and crop a copy of the data.

   

   The original objects and extruded cropping polygon (left) and the cropped result, with Keep geometry > Inside selected (right).