GoochShading
GoochShading[] is a three-dimensional graphics directive specifying that surfaces that follow are to be drawn with a warm color facing toward the light and a cool color facing away.
GoochShading[col] uses cool and warm colors obtained by blending col with slate Blue and Orange.
GoochShading[{ccol,wcol}] uses the cool color ccol and the warm color wcol.
GoochShading[{w1,w2}->{ccol,wcol}] uses the colors ccol and wcol weighted by the wi.
GoochShading["scheme"] uses the specified gradient color scheme in ColorData.
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