This is a continuation, sort of, of another thread, but thought I'd start a separate item here. In aligning two high-poly meshes, I've located three common features in an overlapping region, placed sphere objects there just to see from further away as things align. Nulls 2a and 3a and the mesh-a are parented to null 1a. Null 1a is point constrained to snap to null1b, with its children on mesh-b. So, I've rotated and scaled null 1a until null 2a aligns with null 2b. The idea now is to create an axis between null 1a and 2a and rotate along that axis to swing 3a to align with null 3b, the final rotation to orient the two meshes. If I create a center pivot between 2a and 1a in that order, if it weren't for the parent relationship, that produces the axis of rotation I'm looking for, but the parenting of mesh-a and its nulls under 1a forces the center point to average among all parented objects. I've tried various permutations with primitives to devise a routine, nada. Any ideas? Thanks.