This area is called the core or the hump of the shadow. The darkest parts of the shadow are usually at points of contact, called occlusion shadows, where secondary sources can't reach.Īnother dark part of the shadow is the area just beyond the terminator. It comes from light bouncing up off the ground surface or from other surfaces. Reflected light often raises the tone of the shadow. Outdoors, the blue light from the sky usually modifies the shadow planes, depending on how much they face upward.
The drapery study has the look of an academic exercise partly because it is "overmodeled" which means the tendency to put the full range of modeling factors within each passage. Overhead fluorescents, only slightly less bright, illuminate the shadow side. You can tell it’s a hard source because of the sharp diagonal cast shadow line. In the case of the drapery study above, drawn in graphite while I was in art school, the key light strikes the form from the left.
Within the shadow is not darkness but the effect of other, weaker sources.
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