Generating Curvy Section

Rhino Rhino for Windows
1

Hi all,

I am wondering, is there any way or plug-ins possible to cut a curvy section for curvy objects?
I try Section Tools but found that it can only cut straight sections…

Appreciate for any hints.

Jack
Regards,

2

In the example the geometry is rather simple however when we deal with architectures we have to cut sections through panels, steelworks, RC etc.

3

I assume the section will be the result of the curved section shape projected on the object.

Create a curve with the desired shape of the section. Go to a view corresponding the direction the object will be projected on the object.

Use the Project command.

Alternative: Use ExtrudeCrv to extrude the section shape so that the extrusion passes through the object. Intersect the extrusion and object.

4

I would go with TweenCurves (you need two curves for that), and then either split or wire cut the object with generated curves. In case of splitting you need to do some additional work to close all the pieces into solids, such as extruding the tween curves, and trimming the extrusions against each piece. With WireCut you make sure to set KeepAll to “Yes”.

5

Hi Jack - do you mean a series of section normal to a curve? If that’s it and you’re feeling adventurous, you can try the script here:

http://wiki.mcneel.com/people/pascalgolay

Look for "Section objects radially or along a path curve. " Instructions for installing and using the scripts at the top of the page - this is very old and I have not run it in ages, but as far as I know it works…

-Pascal

6

To make section along any curve, my algorithm is:

  1. Make CURVE (any, even Joined by couple fragments).

  2. Make cut SURFACE (by EXTRUDING curve).

  3. Use function IntersectTwoSets. As first set – select cutting surface, as second – objects to cut.

  4. After previous operation, new generated section curves are selected. Add to this selection cutting surface and Isolate them (or Move/Copy near).

  5. Make new flat surface with length and height the same as cutting surface.

  6. Use FlowAlongSrf. As base surface select cutting surface. Make sure, that Regid option is set to Yes.

As result: Your section will be made allong any curve, and then unroled on flat surface.

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