Radius auto recognition?

Hi all

Can I use GH to for example auto recognize all radius in a solid plate full of holes?
The idea is to have a 3d of a rectangle for example full of passing thru holes in it, and GH recognize the raius of every hole.

Thanks
Sergio

Replies to This Discussion

Permalink Reply by Lars Renklint on July 31, 2009 at 6:18am

Do you mean that you would use a 3dm-model and want all radius? I guess the problem would be to find and reference the holes in GH. Because if you can reference a circle in a plane, you can also find one point on the circle and the centerpoint and measure that. But I have no clue how to find those circles.

Permalink Reply by David Rutten on July 31, 2009 at 6:28am

Piece-o-Cake.

Use a curve parameter to reference all the edges of all the holes (window select the surface, but don't include the 4 straight edges). Feed these curves into a Center component and display the radii using a TextTag:

Permalink Reply by Sergio Silva on July 31, 2009 at 6:42am

Thanks David and Lars

The plate will be aligned with X,Y,Z and the holes will be facing up (Z).

David I wil try your cake a bit :)
regards
Sergio

Permalink Reply by Sergio Silva on July 31, 2009 at 7:01am

David Look below..

What is wrong?

Attachments:

q1.jpg, 147 KB

Permalink Reply by Sergio Silva on July 31, 2009 at 7:10am

If i create a new curve in Rhino it works fine, and if I select the edge of the surface it also works, but if I select the curve that I extracted manually in Rhino is doesn't work, why?

regards
sergio

Permalink Reply by David Rutten on July 31, 2009 at 7:14am

Perhaps the hole isn't a perfect circle? If the curve you extract is a fitted nurbs curve instead of a parameteric circle, then the conversion failed.

Is the error "Failed to convert from Curve to Circle"?

--
David

Permalink Reply by Sergio Silva on July 31, 2009 at 7:28am

No the error is "0 values inherited from....."

attached is the circle I extracted.

Attachments:

circle_only.3dm, 51 KB

Permalink Reply by David Rutten on July 31, 2009 at 7:58am

That's not the error, that's the tooltip info.

In order to find the error, go into the context menu, find the error icon (red sphere) and look at the list of errors.

The circle in the file you posted is actually a polycurve consisting of two 180degree arcs. You can use the What command to inspect geometry.

If you run the _SimplifyCrv command it will be converted into a single circle.

Grasshopper doesn't have a SimplifyCrv component yet, I'll add it.

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