3D graphics have inside and outside surfaces, which can be colored and shaded independently. The drawing port uses the outside surface color and the outside surface shader to calculate the color of the outside surface, and the inside surface color and inside surface shader to calculate the color of the inside surface. The inside and outside colors are defined by the TColor classes, and the inside and outside shaders are defined by the shading and texture classes. Inside and outside surfaces are shown in Figure 190.
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