Modifies the placemark's attributes and properties to achieve a desired level of detail during rendering. This
method is called during rendering in order to provide the application an opportunity to adjust the placemark's
attributes and properties to achieve a level of detail based on the placemark's distance from the view's eye
point or other criteria.
dc - the current draw context.
placemark - the placemark about to be rendered.
eyeDistance - the distance in meters from the view's eye point to the placemark's geographic position.