Grasshopper

algorithmic modeling for Rhino

Cannot subdivide a lofted surface made of rectangles, but I can do so with an ellipse

Hello guys, thanks a lot in advance for any input. I've known about GH for a while, but it wasn't until fairly recently that I started being interested into it. I've been toying around recently and decided to do a very brief exercise by lofting a series of ellipses into a twisting surface, divided the surface in U and V directions and making tubes out of the division lines.

 

However when I tried to do the same with a twisted lofted surface made up of rectangles, the same definition does not work. Like in the ellipse example, I connect the loft component to a surface component, but even though I do not get any runtime errors, the Rhino screen does not show any surface being generated by the surface component. Even worse, when I connect the surface component to a divide domain^2 component, I do get a runtime error, even though no such thing happens with the ellipses.

 

Is this a problem with angled curves? I haven't tried with any other angled curves, but I've tested the same definition with non angled curves and it works fine. What can I do? I'm attaching images of the definitions, thank you.

 

 

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Permalink Reply by Jordi Panzram on July 31, 2011 at 9:38am
I forgot to add another picture
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Permalink Reply by Yoann Mescam (Systemiq) on July 31, 2011 at 10:03am

Lofting the serie of ellipses will give you one single surface.

But lofting the rectangles will give you a polysurface (or Brep), because you simply can't modelize a surface with sharp angles with a single NURBS.

 

2 solutions: -use the Explode component and work on the surfaces from the Brep

 or              -work on a single Nurbs surface really similar to the Brep (you can simply fillet the rectangles in your example, then loft them)

Permalink Reply by Jordi Panzram on July 31, 2011 at 7:32pm

Thanks a lot Systemiq; I'll try my hand on this tomorrow first thing when I have spare time, thank you for the input, it's very well appreciated.

 

 

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