Sometimes when using BIM for presentation purposes, especially during the design development stages, the digital outputs can look a little too polished. In the past an architect might of used hand drawn sketches & diagrams to convey the design. New for Revit 2015 is the Sketchy Lines feature which emulates a hand drawn visual style. This feature is available to be applied to any graphic display style including 3d views, perspective views, elevations, sections & plan views.
You can adjust settings for Jitter and Extension to create unique interpretations of any visual style as shown. The Jitter slider allows to vary the weighting & clarity of the line as if you had drawn it with a pen or pencil, where as the Extension slider allows you to how far lines overlap at intersections. Check out Tim Waldocks detailed overview for more examples of how this feature can be used.
A 3d view with the Jitter set to 7 & no Extension:-
A 3d view with no Jitter & the Extension set to 10:-
The combination of the Jitter set to 7 & Extension set to 10:-