Any roof plane can be turned into a curved roof plane in the Roof Plane Specification dialog.
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Roofs
5447 - Roof Basics
6123 - Hip Roof
6124 - Gable Roof
6125 - Shed Roof
6126 - Gambrel Roof
6127 - Gull Wing Roof
6128 - Half Hip Roof
2420 - Creating a Dutch Gable Roof
1605 - Designing a One-and-a-Half Story Roof
6129 - Generating & Displaying Roofs on a Multi-Level Structure
6131 - Automatic Dormer Tools
25 - Drawing Roofs Manually
1597 - Creating a Roof Cricket
1603 - Controlling Roofs Over Bay, Box, & Bow Windows
704 - Building a New Roof While Maintaining an Existing Roof
728 - Locating Roof Plane Intersections
1529 - Creating a False Gable or Decorative Dormer
26 - Constructing Dormers
708 - Frieze Molding
710 - Generating a Roof Over an L-Shaped House with Gable Ends
714 - Extend Slope Downward
716 - Setting the Minimum Size for Roof Alcoves
746 - Drawing Curved and Barrel Roofs
747 - Creating a Domed Roof for a Round or Circular Building
1956 - Flared Roof
709 - Compound Curved Roof
1500 - The Dialogs that Influence Roof Design
1502 - Controlling Roof Soffits and Fascia
1503 - Using the Gable-Roof Line Tool
1515 - Raising and Lowering Roof Planes
10202 - Roof Tips and Tricks Webinar
733 - Sloping Roof Plane Baselines
1521 - Manually Drawing Dormers
1527 - Creating a Roof with Curved Eaves
1530 - Drawing Parapet Walls with a Flat Roof
1532 - Placing and Modifying Skylights
1533 - Editing the Skylight Curb and Shaft
1512 - Roof Groups
505 - Creating a SIP Roof Assembly
1030 - Exposed Rafter Tails