Hi

Is there a node to take several items of overlapping geometry, and create a single quad mesh around the outside?

For example - around separate pieces of Voroni fracture elements, to create a single mesh which is the union of the parts?

Not quite sure what you're after: you can use a Bound SOP to make a box just big enough to contain the parts, or the Boolean SOP to merge multiple parts together into one union (as long as they do actually overlap); there's also a Convex Hull SOP (if I remember right) that'll give you a closer fitting hull, like the kind you'd want to use for RBD sims, which find concave surfaces difficult to deal with.

What are you trying to achieve?