I\'m working on a web application that manages VRML files. I also want to let users see the uploaded files, without requiring a specific plug-in or player. X3DOM allows viewing
MeshLab! There's an opensource project called MeshLab that does all sorts of processing on 3D meshes. It also has a command-line tool called MeshlabServer.
Running meshlabserver.exe -i -o performs the conversion (very quickly). Since it's open-source, I don't have any licensing issues.