In times of shortened product life cycles and increased product complexity, more responsibility comes with designing a product. Research shows that about 80% of development costs and 70% of life cycle costs of a product are determined during the conceptual phase of this process. This has led to the development of Computer Aided Design (CAD) systems that enable the designer to evaluate the geometry of his virtual design. At this stage of the design process, modifications are still quite cheap, compared with changes to a physical prototype or, even worse, the final product.
The answer to more interactive CAD environments is found in the application of Virtual reality technology. It allows for interaction with a virtual environment through multiple sensory channels. When VR technology is applied instead of or as a supplement to development of physical prototypes, it is called Virtual Prototyping (VP). This is the process of using a virtual prototype, in lieu of a physical prototype, for test and evaluation of specific characteristics of a candidate design. A virtual prototype can be defined as a computer-based simulation of a system or subsystem with a degree of functional realism comparable to a physical prototype.
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