tamte

what do you mean by outer 4 corners? do you have specific shapes in mind?
if we limit ourselves to Polygon primitives, you will typically have 2+ point prims, so what are outer 4 points in a line? triangle? n-gon?

https://www.sidefx.com/tutorials/h13-masterclass-finite-elements/ [www.sidefx.com]

VDBs are sparse so if you shift values by more than narrow band distance you'll simply shift limit surface to areas with no voxels

so if you want to use Volume VOP/Weangle to alter the values, make sure your narrow band width covers the whole offset range by increasing Band Voxels on VDB from Polygons or using VDB Activate SDF

for simple cases you can as well use VDB reshape and reshape by some volume noise masks which would recompute narrow band properly during reshaping