This article introduces an idea to improve the reusability, user friendliness and productivity of a general CFD code and describes the methods that were developed in design and implementation of a postprocessor. This component performed the required tasks to present colour-blended 3D unsteady data on moving bodies, as an application to unsteady CFD data visualization. This work provided general procedures to design and build a postprocessor for numerical modeling code, which is essential for the integration of a CFD code. This design and implementation work integrated the Microsoft Foundation Classes (MFC) in VisualC++ and OpenGL from SGI. Using the procedures and instructions presented in this article, various numerical modeling codes that were developed by research scientists, engineers and graduate students, could be modified with minor effort to become more valuable and productive because the processor adds data visibility, user-friendliness and hence the reusability of a CFD code.