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Figure 2.5 Effect of direction of light source. Drag the slider around the sphere to see the effect of changing the direction of a close light source on the shape of the light zones and the position and strength of the highlight, generated by Ray Kristanto using Maya. Copyright David Briggs and Ray Kristanto, 2007.

Figure 2.7. Multiple light sources. Sliders vary the intensity of one large white overhead light source (topmost slider) and two small yellowish oblique light sources. Copyright David Briggs and Ray Kristanto, 2007.

Figure 10.5. Colour relationships in light and shade. Above. Effect of two different light levels on appearance of a group of surface colours, and the same colours in YCbCr, showing how patterns of relative brightness are maintained. Below: Interactive demonstration of effect of different light levels on a set of surface colours, emulated here by varying the opacity of layers over black.