Enhancements / Additions:

• Added new and improved Periodic surface grid boundary condition capability.  No longer required to specify the reference axis and the transformation is determined automatically from the faces.
• Added ability to create a helix by a specified radius and pitch.
• Added ability to create a blended swept surface.  The surface is a linear interpolation between two swept surfaces generated by generatrix curves on opposite ends of the directorix.
• Change curve parameterization options for splines via the gui SetUp file.
• The visibility of parametric curves are managed automatically by their parent surface.
• The Rebuild volume grid generation boundary condition may be applied to curved surfaces.
• A priority for inserting edge grid points inserted into the surface mesh has been established.

Bugs Fixed:

• Corrected Swept surface to determine the correct path orientation.
• Corrected problem when extracting rational curves from surface geometry.  This problem only appeared when writing Save State files.
• Corrected problem parsing the -gui command line option.
• Corected bug in the 2-D surface mesh generation with Fixed Curves.
• Corrected bug that disabled the discrete geometry functionality.  The bug was introduced in version 5.61

Known Problems and Limitations:

• Trimming IGES-tagged periodic surfaces.
• A beta capability of structured surface grid generation is available and may be applied to NURBS or any four-sided trimmed surface.