The convention of three-point lighting is one that is firmly established in cinematography, and has become one of the main foundations for CG lighting and this is the method and one of the reasons for this is the technique helps to emphasize three-dimensional forms within a scene using light.
Key light
The key light is the dominant light, or the one that casts the most obvious shadows. (For instance it could be for night time indoor shots, sunlight for outdoor work or sunlight entering through a window for daylit indoor shots). This defines a scene’s dominant lighting, giving the biggest clue to the location of the presumed light source.
Fill light
The job of fill lights is to model the indirect lighting that is produced by direct light bouncing off an environment’s surfaces. Generally its position is on the opposite side of the subject from the key, where it opens up the lighting on the side of the subject in shadow and reduces the density of the shadows.
Backlight
Of course the designers could create more lights according to their aims and in my opinion we could make it just like painting.
Richard Cadena has ever said that light is like paint, and lighting a set is like painting a canvass. Then we can make the following associations:
a. abare lamp is like a bucket of paint.
b. a luminaire or texture that the lamp goes in is like a paint brush or air compressor and air gun.
c. the beam angle is like the width of brush stroke.
d. illumination is like the thickness of the paint on the canvas.
Definitely, such a lighting method is totally different from Global Illumination and HDR(High Dynamic Range) images, which is more flexible for artists.
Reference:
Cadena, R. Focus on Lighting Technology.
Brooker, D. (2003). Essential CG Lighting Techniques with 3ds Max. Oxford
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