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Help > Building a 3D Model > Referencing Tools > Referencing Marks > Point Auto-detect Mode
Point Auto-detect Mode

The Point Auto-detect tool (only available in PhotoModeler Premium) provides a quick way to model objects. The tool is on the ribbon toolbar’s Create Tab (Referencing group).

This mode is similar to the manual process of clicking on photos to mark points and then referencing the marks together, but here only one mark is placed manually and the other marks are automatically detected, marked and referenced. PhotoModeler studies and compares the image data in all applicable photos with the image region around the first manual mark, and picks the best matches.

Point Auto-detect requires that the photographs be oriented well, that the photos have good overlap and the angles not be too large. In this way, the feature works best in SmartMatch projects.

When in the mode, and the cursor is over a photo, the cursor changes to the Point Auto-detect cursor:

When you click on a distinct feature in a photo, PhotoModeler attempts to detect that feature across photos that are deemed most likely to contain the best matches. Once a point is marked, the associated automatically detected point marks appear in the Point Review pane (see Point Review Pane ), where marks can be reviewed, adjusted, or deleted. All photos on which the point was auto-detected will be displayed in this pane, centered on the potential matches.

This is an example of a window mullion feature marked on the source photo (red point), and automatically detected in the other photos in the project (blue points in the Point Review pane docked at right, showing each photo on which the point is marked):

A picture containing building, window, apartment building

Description automatically generated

You can adjust or delete the detected marks from any of the review images.  If a marked feature isn’t well defined in a photo, the matched feature mark may not be accurate, and therefore an adjustment may be needed. In some cases where the feature is very weak the match can be wrong in which case the mark can be deleted (see the Point Review Pane for further detail).

If the point is not detected on any photos, an alert will appear in the bottom right of the application window, and only the source photo will show in the Point Review pane.

Any oriented photo can be used as the ‘source’ photo, as PhotoModeler will automatically determine the best ‘destination’ photos for the mark. 

The mode’s right click menu has tools to delete marked points (either just the automatically detected marked point on a photo, or all detect points on all photos including the clicked photo mark), and also has a toggle button for drawing lines between auto-detected points.

Note: There may be a delay on the first click on a photo while PhotoModeler builds a camera definition based on the lens distortion ‘map’ for feature matching. This map is in the form of an .ldl file which gets stored in the project folder once the project is saved. The distortion map gets built during Point Auto-detect mode, and in various other modes such as MVS or Ortho Export, so once it’s created the project should be saved to speed up future operations.

Various preference settings control how Point Auto-detect matches features across photos (see the Referencing pane - Preferences - Marking and Referencing).