Is the ʼRevolveʼ tool used for creating symmetrical round objects in Rhino?

Short Answer

Yes — in Rhino 3D, the Revolve command is the standard professional tool for creating symmetrical round objects from a 2D profile rotated around an axis. It is the fastest common method for bottles, knobs, bowls, and turned parts. Limitation: it only works correctly when the profile and axis are set up accurately.

What You Need to Know Before

Warning: If your profile curve crosses the revolve axis or is not cleanly planar, Rhino can generate self-intersecting or invalid surfaces/polysurfaces. A common failure is revolving an open or poorly aligned profile and getting bad joins or unusable solid geometry.

How to Use Revolve in Rhino

• Command: Revolve

• Shortcut: Revolve

• Quick Steps:

  1. In a Front or Right viewport, draw or select the 2D profile curve, then type Revolve in the command line.
  2. Pick the start and end of the revolve axis, or use object snaps to define it precisely.
  3. Set the angle, typically 360, then use the Cap=Yes option if you want a closed solid from a closed profile.

Variables & Settings

• Key Setting: Cap=Yes/No

  • Expert Setting: This option determines whether planar ends are automatically closed when the revolved shape can form a solid. Use Cap=Yes for most manufacturing-ready closed forms; leave it off when you need an open surface.

Why it Fails

• Cause 1 (Geometry): The profile is open, non-planar, or intersects the revolve axis, causing invalid or self-intersecting results.
• Cause 2 (layers/Locks): The profile or axis reference geometry is on a locked layer, so you cannot select or snap to it correctly.
• Cause 3 (Command/Logic): The axis is picked in the wrong location or the revolve angle is incorrect, producing the wrong form or an open partial surface instead of a full object.

Quick Fix & Best Practice

• Quick Fix: Run SelBadObjects after revolving, and if needed rebuild the profile with Rebuild or correct it before running Revolve again with Cap=Yes.
• Manager’s Verdict: Use Revolve for any axisymmetric part because it is faster and cleaner than patching surfaces manually. Avoid it when the object is not truly rotationally symmetric or when the profile crosses the axis.

FAQ

Is Revolve better than Sweep for round parts?

Yes, for perfectly axisymmetric shapes, Revolve is usually faster and more accurate.

Can Revolve make a solid in Rhino?

Yes, if the profile supports it and Cap=Yes closes the planar ends.

Do I need a closed curve to use Revolve?

No, but an open curve usually creates a surface, not a closed solid.

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