Enhancements / Additions:

• Added lighting control to turn off individual light sources and control the intensity of individual ligth sources.  The intensity can also be set using the LightIntensity parameter in the gui set-up file.
• Modified the grid topology repair toolkit to work with only the selected surfaces rather than the entire model.  Removed the Edge Collapse operation.
• Modified the grid tool checkgrid to automatically remove orphaned nodes and boundary faces with invalid normals and improved the output messages to be more informative.

Bugs Fixed:

• Corrected bug with creating composite surfaces when the component surfaces have inconsistent normal directions (introduced in v5.8.0).
• Corrected bug with discrete geometric edges that were being flagged incorrectly after certian CAD and topology operations.
• Corrected bug in the grid tool surftool for operations that involved reading only the surface grid information and not the entire volume grid.

Known Problems and Limitations:

• Trimming IGES-tagged periodic surfaces.