Locates a language-described functional part of a rigid object or fixture from calibrated RGB-D and fits a typed loop, shaft, tip, aperture, surface, or region feature with a metric centre, axis, and radius, either inside an already-segmented parent or end to end from a described object, protruding shaft, directed tip, or lidded aperture. Use when a manipulation step depends on where a specific part is rather than on the whole object, such as a tool loop to hang, a shaft to hang it on, an insertion tip, or an opening to insert into.
