meshconv

Designed as a command-line application, meshconv is a free 3D model converter with support for multiple file types when it comes to geometry. It offers almost full support for VRML 2.0, namely version 2.0 for the input, along with 1.0 and 2.0 for the output.

At the moment, the tool supports only simple geometry for Geomview (OFF), Wavefront (OBJ), AutoCAD (DXF), 3DS, PLY, STL, and three.js JSON. To find out the parameters, you can call its process from a Command Prompt dialog without inputting anything else.

The usage is meshconv [-c ] [-o ] []

As far as the options are concerned, you can print VRML hierarchy details (-ph), as well as specify the complexity of the sphere (-s ) and cylinder (-cc ) when reading VRML. It's possible to indicate the VRML version (-vrmlver) if you want to convert to VRML, and to write a separate OBJ group for every lowest level VRML grouping mode when converting from VRML to OBJ (-sg).

Plus, you can write a separate STL file for every lowest level VRML grouping mode (-sg), for every VRML geometry node (-sf) and for every DEF'd VRML grouping mode and Indexed FaceSet when converting from VRML to ASCII STL.

You can use 1994-style PLY type names (-plyold) when converting to PLY, write an ASCII instead of a binary file when converting to PLY or STL (-ascii), relay texture coordinates to the OBJ file when converting from VRML to OBJ (-rt), as well as convert to .js and binary .bin (-binary) or to ASCII .js otherwise.

The polygon counts can be printed (-pc), while the mesh can be triangulated (-tri).