Data Matching question

I am using planes (PerpFrames) on a curve to cut sections through a solid (Brep). The curve and the solid only partially overlap, therefore only some of the planes are actually sectioning the solid.

My question is how I can match which planes are actually cutting sections and match those back to the sections they are creating?

My reason for wanting to do this is so I can create a new set of planes with their origin points at the centroid of the sections but with the same X & Y axes. I realize I could do this visually (by extracting list items for example), however I am looking for a more robust solution that would allow me to use this procedure with different numbers of sectioning planes as well as with different guide curves and different solids.

Below is a screenshot of what I'm working with, and the rhino file and grasshopper definition are attached.

Thanks.

Attachments:

Section Matching Problem.3dm, 203 KB
Bar Section Example.gh, 3 KB

Replies to This Discussion

Permalink Reply by Michael Pryor on May 17, 2012 at 10:25am

can you post rhino 4

Permalink Reply by Josh Lobel on May 17, 2012 at 10:35am

rhino 4 version of the model attached.

Attachments:

Section Matching Problem.3dm, 198 KB

Permalink Reply by Danny Boyes on May 17, 2012 at 10:38am

Don't flatten the output and don't clean the tree.

Although there is a bug at the moment in this particular area of Path Output which puts all Nulls (misses) on one branch.

But you should be able to work out from the path Structure which the sections are by the branch address.

If your planes start on the left then you would have seen

{0} (N = 3) <-- these are your first 3 planes missing the bar

{0;3} (N = 1)

{0;4} (N = 1)

{0;5} (N = 1)

{0;6} (N = 1)

Like I said there is a bug which will be resolved when GH 0.9+ will be released and each plane will have its own branch regardless of a Null value or not

Permalink Reply by Michael Pryor on May 17, 2012 at 11:10am

this is good news :)

Permalink Reply by Danny Boyes on May 17, 2012 at 11:23am

The Bug:

http://www.grasshopper3d.com/forum/topics/is-there-a-bug-in-the-num...

and

http://www.grasshopper3d.com/forum/topics/data-trees-and-nulls-wish...

.................

The Solution

http://www.grasshopper3d.com/forum/topics/gha-developers-pay-attent...

and

http://www.grasshopper3d.com/forum/topics/assigning-lists-to-output...