3D Features Using the Max Incidence Angle

Laser Auto features have a Horizontal and Vertical clipping zone. PC-DMIS initially evaluates all scanned points within the clipping zone.

For 3D features (Surface Point, Plane, Cylinder, Cone, and Sphere), this setting compares the estimated normal of each scanned point to the feature theoretical normal or the vector of the CAD surface if a CAD model is used.

Points with a vector that fall outside of this angle are excluded when measuring the feature.

On a thin sheetmetal part that was scanned from both sides, a Laser Auto Surface Point was created.

The Feature Extraction - Vertical clipping zone is set so it includes the part deviations, which in this case are larger than the sheetmetal thickness.

In this image, the scan uses no Max incidence angle:

Since the normals of the scanned points are not taken into consideration, the extracted point uses data from both sides of the part.

In this image, the scan uses a Max incidence angle of 60 degrees:

The software compares the estimated normal of each point in the clipping zone to the laser auto surface point theoretical normal. PC-DMIS does not use points that fall outside this angle for the feature calculation.

Laser extraction of a sphere previously required additional steps and manual selection to exclude adjacent surfaces.

In this image, no Max incidence angle is used:

PC-DMIS uses data from the adjacent plane for sphere calculations.

In this image, a Max incidence angle of 60 is used:

PC-DMIS includes a few outlying points.

In this image, PC-DMIS uses a Max incidence angle of 45 degrees:

In this final example, the actual sphere data is best represented.