Rhino 3D Tip: Creating Accurate Rotational Geometry with Rhino Revolve

Use Rhino’s Revolve command to turn a 2D profile into accurate rotational geometry such as bottles, knobs, lampshades, bowls, turned parts, columns, and mechanical components. A well-built revolved object is usually cleaner, lighter, and easier to edit than a model assembled from multiple surfaces.

The essential idea is simple: Rhino rotates a profile curve around an axis. However, the quality of the result depends heavily on the profile, the axis placement, and the selected revolution angle.

• Start with a clean profile curve. Draw the cross-section of the object in a planar view, typically Front or Right. Use as few control points as possible while still achieving the intended shape. Overly complex curves can create unnecessarily dense and difficult-to-edit surfaces.
• Place the profile correctly relative to the axis. For a centered object, position the profile on one side of the axis rather than crossing it. If the curve crosses the axis, Rhino may create self-intersecting geometry, especially with concave profiles.
• Use a reliable axis. The revolution axis can be defined by two picked points, an existing line, or a construction axis. For precision work, create a centerline first and enable Object Snaps such as End, Mid, and Center.

Run the Revolve command, select the profile, and define the axis. Rhino then asks for a start angle and end angle. A full 360-degree revolution produces a complete form; a smaller angle creates an open segment, useful for cutaway studies, curved architectural panels, or partial mechanical features.

For a closed profile that touches the axis at both ends, a full revolution can create a closed solid. This is particularly useful when modeling parts intended for fabrication or 3D printing. After creating the object, use What or the Properties panel to confirm whether Rhino reports it as a “closed polysurface.” You can also use ShowEdges to identify naked edges if the object was expected to be watertight.

• Choose “Solid=Yes” when appropriate. If your profile is closed and does not touch the axis in a way that causes overlap, this option can create a capped solid directly.
• Watch the seam. Every revolved surface has a seam where the rotation begins and ends. Use SrfSeam when seam placement matters for trimming, matching, texture mapping, or downstream surface editing.
• Use history for iterative design. Turn on Record History before running Revolve. Editing the original profile may then update the revolved result, enabling a more flexible design workflow.
• Check curvature before revolving. A small kink in a profile becomes a circular ridge around the entire object. Use CurvatureGraph or GCon to inspect important transitions before generating the final surface.

A practical workflow is to construct only half of a symmetric profile, revolve it 360 degrees, then add details such as fillets, grooves, holes, or Boolean cuts afterward. This keeps the foundational form simple and preserves the advantages of rotational symmetry.

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