Is Brep a surface of revolution?

Rhino Developer
1

Is there any way to test if a Brep is a surface of revolution?

2

… and extract the generating curve and axis of rotation?

3

Not sure if there’s a specific function for Breps, but if you can get the underlying surface(s), and the geometry is simple enough, Surfaces have the functions IsCone, IsCyliner, IsSphere and IsTorus.

4

With some assumptions about how Rhino constructs surfaces of revolution, I can apply heuristics to the Curves3D list to extract an axis of rotation and generating curve. I was hoping that Rhino would note that information somewhere when the surface was constructed.

5

All this information is available, but not exposed to RhinoCommon yet. I’ll add an item to our to-do list to expose more of the underlying information.

6

There is the tracking link:

http://mcneel.myjetbrains.com/youtrack/issue/RH-28908

7

Thanks, Dale. As a developer of shrink-wrap software for over 20 years, I’m impressed by your responsiveness.

8

Hi Dale,

I would like to second this request. Having more of the ON_RevSurface information available via RhinoCommon would be really helpful.

Thank you,