User Guide > Camera solving > 
Defining point relations
 
 
 

Point relations appear within the Point Relations folder in the Project window. When you run the camera tracker, MatchMover uses the enabled point relations.

TipYou can start running the solving process without point relations. Then, if needed, add them to improve the results.

Point relations apply to the coordinate values of one or several points. When setting a coordinate constraint, you define the coordinate (X, Y, or Z) that is shared by the selected point or points.

Then, you set the parameter type as follows:

For each point, you can independently set point relations for all three coordinates (X, Y, or Z).

Tip If you know the coordinates of 3D points in the scene, from manual measurements or from a map, you can provide MatchMover with this information. You can either create three point relations for each survey point, one involving each coordinate and setting their parameter to Initialized or Fixed, depending on the accuracy of the survey data or you can directly enter those coordinates in the corresponding track 3D parameter tab, as survey info.

A relation involving one point and whose parameter is set to Unknown does not provide any information and will not be used for calibration.

Creating a point relation

To create a point relation:

  1. Select the points you want to include in the relation from the Point Tracks folder of the Project window.
  2. Do one of the following:
    • Select 3D Tracking > New Relation.
    • Click the New Relation icon in the Toolbar.
    • Right-click the Point Relations label in the Relations folder in the Project window and select New Relation from the pop-up menu.

    A new relation is created featuring all the points that were selected. A new Relation label appears in the Point Relations folder. All featured points are listed (the points selected from the Point Tracks folder) in the Parameters Window and can be sorted using the up and down arrow keys.

    NoteIf no points are selected from the Point Tracks folder, a new relation is created containing no points.
  3. You can add extra points:
    • By selecting them from the right list box and add them to the left list box using the left arrow button.
    • By selecting track(s) in the Workspace, right-click a relation in the Project window, and select Add Selection.
    • By dragging and dropping tracks directly from the Point Tracks folder in the Project window into the Point Relations folder.

    To remove points:

    • By selecting them from the left list box and add them to the tight list box using the right arrow button.
    • By selecting track(s) in the Workspace, right-click a relation in the Project window, and select Remove Selection.
  4. In the Parameters Window, from the Type field, select the relation type for points that share a coordinate. Share X, Share Y, or Share Z.
  5. From the Status field, select the status for this relation. It can be Fixed, Initialized or Unknown.
  6. If you select Fixed or Initialized, enter the value in the Value field. If you select Unknown, the Value field is disabled.
  7. To enable this point relation, click the Enable box to check the option.
    NoteIf a point belongs to several point relations of a given type (X, Y, Z), only one of these can be enabled.

Relations are shown in the 3D View as a semi-transparent rectangle in the appropriate plane. The rectangle’s edges are normal to the coordinate system axes. The relation rectangle is the smallest that contains all points featured in the relation; however the rectangle has a minimum width and height that ensures that it is not restricted to a thin line if all points are aligned on one axis.

NoteTo change the color of the relations displayed in the 3D View, select Edit > Preferences, click the Color tab in the User Preferences window, and change the color of the corresponding sample box.

To show or hide relation planes in the 3D View, select Display > Relations.

Deleting a relation

To delete a relation:

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