This displays the surfaces as only their outer boundaries and trimmed loops. No additional lines are drawn in the interior of the surface. This makes the display of larger models much faster.
This displays the surfaces with lines in the interior of the surface. This aids visualization, but for large models, it makes the display of the part slower.
This displays the surfaces with more lines. Decreasing the value of Surface Fineness improves the display quality but slows down the graphics.