Chain Constraints

The Constraints - Basic page defines the following constraints for a chain:

Constraint	Description
Angle Between	To constrain a chain so that access to or from the chain is limited by the minimum or maximum vector angles among the objects in the chain, specify the Minimum and/or Maximum vector angle. The angle between computation is computed using true positions, consistent with the Chains access computations when the Chains light time delay is off. The Angle Between constraint is valid only for a chain that contains exactly three objects.
Link Duration	To constrain a chain so that accesses that are of shorter duration than the specified Minimum value are excluded from chain access results, specify the Minimum duration for a link between two access objects.
Filtering Intervals	Select the Use check box, and specify an .int file to filter the computed chain access intervals.

Constraint

Description

Angle Between

To constrain a chain so that access to or from the chain is limited by the minimum or maximum vector angles among the objects in the chain, specify the Minimum and/or Maximum vector angle.

The angle between computation is computed using true positions, consistent with the Chains access computations when the Chains light time delay is off.

The Angle Between constraint is valid only for a chain that contains exactly three objects.

Link Duration

To constrain a chain so that accesses that are of shorter duration than the specified Minimum value are excluded from chain access results, specify the Minimum duration for a link between two access objects.

Filtering Intervals

Select the Use check box, and specify an .int file to filter the computed chain access intervals.