CAD tip # 12034:

Download the SolSimilar.vlx file from Download, load it with the APPLOAD command and type the SOLSIMILAR command or use 'solsimilar on any AutoCAD "Select objects:" prompt. All matching solids will be selected (grip-selected).

Pick the sample (primary) 3D solid (3DSOLID object) and all its copies with the same geometry will be also selected. The tool checks the following properties: the type of the solid (box, sphere...), width, depth, height, volume, surface and principal moments. Position, rotation or layer is not relevant.

You can preset the _solsimilarfuzz LISP variable to change the fuzzy-factor for comparison of geometric properties. E.g.:

(setq _solsimilarfuzz 0.001)

and the boolean variable _solsimilarignorerot for ignoring any differences in rotation of objects (both 2D and 3D) - this will match even rotated solids:

(setq _solsimilarignorerot T)

for these two settings, you can also use the commands SolSimilarIgnoreRot (toggle) and SolSimilarFuzz.