The way a model is built plays an important role in optimizing rendering performance and image quality.
In order to minimize the time it takes to render a model, it is common practice to remove hidden surfaces or hide objects that are positioned off camera. Furthermore, ensuring that all face normals orient in the same direction can also speed up the rendering process.
Certain kinds of geometry create special rendering problems.
When you render a model, the density of the mesh affects the smoothness of surfaces.