message: ensure single element loci have some volume in volume interaction behavior
diff: @@ -244,7 +244,12 @@ export namespace VolumeStreaming {
  const root = this.getStructureRoot();
  if (!root || !root.obj || root.obj !== parent.obj) return Box3D.empty();
  - return StructureElement.Loci.getBoundary(StructureElement.Loci.extendToWholeResidues(loci)).box;
  + const extendedLoci = StructureElement.Loci.extendToWholeResidues(loci)
  + const box = StructureElement.Loci.getBoundary(extendedLoci).box
  + if (StructureElement.Loci.size(extendedLoci) === 1) {
  + Box3D.expand(box, box, Vec3.create(1, 1, 1))
  + }
  + return box;
  }
  private updateInteraction(current: Representation.Loci) {
  @@ -263,7 +268,6 @@ export namespace VolumeStreaming {
  }
  const box = this.getBoxFromLoci(loci);
  - if (!box) return;
  this.updateDynamicBox(box);
  }
  