### 5.4.3 Choosing a Shading Model

By default, the graphics library uses a flat shading model for coloring geometric objects, i.e., all vertices are assigned the same color. A primitive can also be smooth (Gouraud) shaded. In this model, all vertices are treated individually. The library uses linear interpolation to color the primitive. Shading model is controled by

`void EZ_ShadeModel(ind mode)`

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