Determines whether to apply entire scene anti-aliasing.
If this property is set to true then text, polygons and images
will be anti-aliased together instead of individually. This uses
considerably more memory and takes considerably longer but can
result in higher quality output.
When this property is set to true this implicitly disables any
other anti-aliasing applied to individual object types.
Anti-aliasing is a technique for using gradients of color to
eliminate jagged edges when objects are drawn.