The tools described here can be used for this purpose. Examining a Wireframe rendering of a curve or surface can be used for the first stage of defect identification where you are finding the only the more visible local and global defects. Wireframe images where entities are shown as a collection of line segments, however, have several drawbacks in defect identification. The most important of these is that it does not easily identify a large number of local defects even at very high resolution. Thus wireframe rendering is not good for identifying these types of defects.
Ambient light provides uniform adjustable illumination independent of viewing direction.
A point light source provides directional light whose direction and intensity can be changed. Simple flat shading of an object is only a small step above wireframe rendering with hidden surface removal. It is normally used for quick interrogation of flat surfaces. Using this function each surface polygon gets a normal and a color and brightness are assigned depending on this normal. Although this method is fast and easy, it does not identify any more defects than wireframe rendering would.