Question about Sweep2 Component in GH

I am able to get the Sweep2 Component to work from one ellipse to another, but when I try to rotate the top one I can't seem to get the Sweep to work. The component doesn't show an error, it just gives "empty Brep parameter" as the output.

Probably overlooking something simple, but I have gone over it enough times that I thought I would put it out as a question for anybody willing to look.

Thanks for any time spent looking

Attachments:

Question about Sweep2Rail.ghx, 256 KB

Replies to This Discussion

Permalink Reply by taz on March 7, 2011 at 8:08pm

When I open your file it seems to be working fine.

Scrolling your "Twist" slider will cause failure because your sweep curve should be located at the start of your corresponding rail curves.

Permalink Reply by AB on March 7, 2011 at 9:18pm

Taz, Thanks for taking a look at the file.

I too am able to sweep the two curves, until I rotate the top. Is there a way to redefine where the "start" of the top ellipse so that it remains in line with the rail to sweep?

Maybe I need to go about this an entirely different way. When I bake an iteration where the top curve has rotated, I am able to sweep2rails from within Rhino, but it would be nice to keep it in Grasshopper for visualization.

thanks for any ideas

Permalink Reply by Chris Tietjen on March 8, 2011 at 9:13am

Check out the definition. The seams remain aligned. I may have missed some subtlety though.

Chris

Attachments:

QuestionaboutSweep2Rail.ghx, 309 KB

Permalink Reply by AB on March 8, 2011 at 10:17am

Chris and Taz, Thanks again. It is now working the way I had hoped. I tinkered a bit with Chris's version and I was able to get the bottom ellipse to stay put while the top twisted...

and still allowed a sweep to happen.

It is nice to have this part working as I can see how awkward many of the forms are as I make changes.

Thanks to you both.

Attachments: