Set Geometric Constraint
Geometric constraints on points can be set
in the Setup page to improve the accuracy of
3D computation. Here are the steps to setup a constraint by selecting
a group of points.
- Select the Constraint subpage in the Setup Page of the Main Window.
- Select the desired constraint type. You can view all the different types
of constraints by clicking on the button next to "Type".
- To create a new constraint, type in a name in the "Name" field and
press the key.
- To create a new constraint, type in a name in the [Name] field
and press "Enter" key. To select an existing constraint to
edit, double-click on a constraint in the
listbox. When a constraint is selected, all its points are
highlighted in all the Image windows.
- Change the weight: This step is usually not required,
and the default weight value 1.0 is suitable for general
constraints. The weight reflects the strength of the
current constraint comparing to other
constraints when a conflict occurs.
- Edit points in the constraint:
- To add one point to the constraint, click the Shift-left mouse
button on a mark in an Image window. Users will see the point being
added (all its marks are selected).
- To add a group of points into the constraint, click and hold the
Shift-left mouse button at one end of the group, then drag the
mouse to the other end and release. This creates a rectangle which
encloses all the points added to the current constraint.
- To delete a point from the constraint, double-click the Shift-left
mouse button on its mark in the Image window.
- A constraint can be deleted by using the "Delete" button in the Setup
page.
Misusing and incorrectness of the geometric constraints may lead to
large computation error and even a computation failure. See Tips for Setting Geometric Constraint for more
information.