What's new in version 4.0?
Real-Time Stereo
Vectors
Annotation
Smoothed Graphics
Custom Bond Styles
Selection & Editing Tools
Best-Fit Plane Through Points
Interface Improvements
Miscellaneous
What's new in version 3.1?
CD-ROM Edition
Online Help
Miscellaneous
What's new in version 3.0?
Interface Improvements
Building & Editing Structures
Data Import/Export
Display
Transformation
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