There have been two major changes to the merge tolerance.
- Merge tolerance has previously been based on a hard coded value, 0.1mm. This was not suitable for very large or very small models. The merge tolerance is now based on the global edge length internally. When changing global edge length, the merge tolerance is automatically applied.
- Merge tolerance only applies to NURBs meshing of iges models and regions. The merge tolerance option has been moved from the General tab to the NURBs tab of the Generate Mesh dialog.