My Enhanced CAD Program (from Stephan Zerbst)

• Converted the project from VC6 to VC2008. Fixed variable initialization errors and several memory leaks inside the graphics dynamic link library ZFXD3D.dll and rebuilt the dll. Fixed Libc.lib, Libcd.lib not found linker error.
  
• Fixed exception from saving and loading levels.
  
• Modified code that renders backfaces correctly.
  
• Added geometry rotation UI option in addition to the existing translation options.
  
• Added menu option to create more stock geometry such as sphere, ellipse, Bspline, raster images.
  
• Added option to create cell group element that represents a collection of geometries.
  
• Added a geometry element attribute called "Level". Basically a level has its own color, line width, and texture. A geometry element such as an ellipse that belongs to a particular level inherits all the attributes from the level and overrides its previous attribute. For example, if a triangle is green and it belongs to "level 32" which has a color of red, then triangle has the "level 32" color red instead of its own color.
  
• Enhanced view navigation. Modified translation and rotation factors so that the scene can be navigated more comfortably.
• Added the ability for a file to recursively reference and import transformed contents from an external file. For example, file 'A' can reference and contain all the contents of file 'B', and file 'B' can in turn contain all the contents of file 'C'.
• Added tooltip text display.