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    Apply varying colors per-vertex to WebGL triangles

    In this lesson we will apply a single color per vertex and see how those colors are interpolated across an entire triangle, making use of a new kind of shader variable. We will also see how enabling gl.DEPTH_TEST will give our model proper depth by having webGL pay attention to z-values. Note: This lesson assumes prior knowledge in WebGL. Check out Create 3D Graphics in JavaScript Using WebGL for an in depth introduction to WebGL if some of these concepts are feeling unfamiliar.

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