The use of Computer Aided Design software is widely used in construction of other manufacturing industry. When designing and working on a new project or new product, an engineer will require frequently modifying or upgrading the original design. Therefore, before the end product is produced, the original design drawing file will be modified with multiple versions. If all these different version design documents and drawings are not managed properly, a series of problem or error will sure happen at the production stage.

　　Drawing comparison is part of the process in drawings management. Engineering drawings are usually complex. A different versions drawing files may have only slight changes. In the traditional way of comparison, engineers will have to manually locate the changes between the two drawings. The will result in potential human errors or lower the engineering management efficiency.

　　There are three options in VHCompare drawings comparison: Coordinate system comparison, Select base point comparison, and Select area comparison. User may choose any of these 3 options to perform comparison process base you’re their real life situation.

The following are VHCompare unique features.
A、Higher performance      After comparison, user may make changes in AutoCAD at the same time
B、User friendly
      Zoom and pan in AutoCAD, these features will speed up to locate difference in drawings files. The system also provides base point comparison and selected area comparison options.
C、Comprehensive
       Xref, layout and proxy images for custom object can also be compared