Before CAD modelling, pre-1995, ‘3D’ games consisted of 2-dimensional bitmap based sprites as characters or objects animated in a 3D map-based background. The 2D sprite was disguised as 3D by having it always facing the camera. This technique is used in old games such as Duke Nukem 3D, Doom and Quake I. Having a sprite based on bitmap, however, produced poor quality images when you got the camera too close to the object. This is because bitmaps are 256 limited colours, pixelated (dotted or blocky) images used for computer painting. They become blocky and hard to see when zoomed in or resized. CAD and CAD modelling use technical drawing techniques. The difference between computer painting and drawing is:

Painting involves changing the colours of pixels using a painting tool or program, like Microsoft Paint. You can apply colours gradually, with soft edges and transitions, and manipulate individual pixels using filter effects. However, once you apply a brush stroke, there is no easy way to select the entire brush stroke and move it to a new area in the image.

o Shapes or models are object-oriented--you can quickly select, resize, and move a shape, and you can edit a shape's outline (called a path) and attributes, such as line weight, fill colour, and fill style.

Working with shapes or 3D models provides two advantages:

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