MNHiddenLines by DeveloCAD performs mathematical calculations to accurately determine hidden lines in designs.

What's great about this product is that it comes with detailed documentation in both Windows Help format and Adobe PDF file. Not to mention, it also includes a variety of samples for Borland's Delphi and an ActiveX component that allows you to implement the library in various development systems.
Overall, this user-friendly product is a great choice for those interested in developing CAD applications. And with the reliable support of develoCAD, you can rest assured that you will have access to assistance whenever it is needed.
Version 1.1: N/A