Seeing the Tessellation Levels
You can see the difference in the following figures:
Figure 9.2. A very low-detail sphere.
As you can see here, this “sphere” doesn't look much like a sphere. Hardly any triangles are being drawn, it looks all blocky in solid fill modes, and it's just not very realistic. However, if we just split each triangle into multiple triangles (subdivide) a few times, it looks much better.
Figure 9.3. Adding detail to the sphere.
The sphere looks much more like a sphere now than it did before. Each triangle has been tessellated ...
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