Fixed Constraint

Status: Implemented

Fixed Constraint dialog

Fixed constraints lock an assembly component in place so other constraints treat it as immovable. They usually provide the reference frame that every other constraint solves against.

Inputs

  • id – solver-assigned identifier that appears in the constraint list.
  • component – single component selection. No other entity types are accepted.

Behaviour

  • Resolves the selection to an assembly component and verifies that it exposes the isAssemblyComponent marker used throughout the solver.
  • Marks the component and its owning feature as fixed (component.fixed = true and feature.inputParams.isFixed = true) so downstream calls to isComponentFixed() short-circuit.
  • Stores a friendly component name in persistentData.componentName for UI presentation.
  • Reports whether the component was already fixed so the UI can skip redundant status updates.

Usage Tips

  • Always fix at least one component in an assembly; otherwise every constraint will read as blocked because both sides appear movable.
  • Use Fixed constraints for temporary jig components: remove the constraint after the rest of the assembly is solved to free the part again.
  • When importing legacy data, run the solver once—Fixed constraints will refresh feature metadata that older saves might not have populated.