1. A system, comprising: a processor and a memory in communication with the processor, the memory storing programming instructions executable by the processor to: from a 2D image, define a family of 3D models of objects consistent with that image; automatically select one of the 3D models as a function of at least one of a compactness metric, and a surface area metric as applied to the family of 3D models; and generate human-discernable output as a function of the selected 3D model.