What is the difference between 'Projected' and 'Hidden' lines in Revit?

The distinction between projected and hidden lines in Revit is significant for conveying information about the visibility of edges within a drawing. Projected lines are used to depict the edges of an object that are directly visible in the current view, effectively indicating the outlines or boundaries of the 3D elements as they would appear in the real world. This visibility plays a crucial role in ensuring that the design is communicated clearly and accurately to anyone reviewing the drawings.

On the other hand, hidden lines portray elements that are not directly visible from a particular viewpoint. They are typically represented using a dashed line format, distinguishing these lines to indicate that while these edges exist, they cannot be seen from the current perspective. This aids in illustrating the complete form of an object by suggesting where edges or contours are located behind other elements.

The other options do not accurately define these line types, as projected lines are not specifically dashed and solid lines, nor are they exclusive to either 3D or 2D representations, and they certainly are not used interchangeably. This clarity between the types of lines allows architects and designers to communicate complex information effectively within technical drawings.