A 3D image can give a more realistic impression than a 2D image. Many designers will construct new products on screen that can be easily modified and manipulated. These virtual products can be tested and evaluated on screen without actually being manufactured.

Wire frame model - a wire frame model is a visual representation of a 3D object created using a collection of straight lines, curves and intersections. The result is a transparent 'skeleton' of a drawing that gives an impression of the overall 3D structure.

Advantages of wire frame model:
*Simple and fast to calculate on a computer.
*Able to view changes or rotate the object without long delays

Surface model - a surface or 'skin' is added to the wire frame model, making it a more realistic picture of the 3D object.

Advantages of Surface model:
*Greater definition of contours and surfaces.
*Hidden lines can be removed to give a more solid feel.

Solid model - the production of a full digital representation of an object complete with the properties of the solid form.

Advantages of Solid model:
*Clear communication - no confusion.
*Photo-realistic image produced using rendering techniques to apply shading, pattern and texture.