We just enabled a new Active property for JointInstances , WeldConstraints , and Constraints .

Active is true when:

The joint is Enabled (for Constraints)

The joint itself and both of its parts are in Workspace

The joint is active in world Always true for simulated joints if the above are true More complicated for rigid joints like Weld, Snap, WeldConstraint, and Motor6D



Welds between two parts in Roblox are mutually exclusive: there can only be one transform between two parts at any one time. When there are redundant welds or welds forming a cycle we might need to ignore some of those welds to prevent potential conflicts.

We have a system called the “spanning tree” that decides which welds are currently being ignored and which are currently active. With the new Active property now you can tell which is which!

This should be useful when we make the change to stop automatically removing redundant welds. Now you know which welds are being ignored and safe to remove!