Trouble lofting a curve while "graft" is active in point B slot

Hello all,

I'm designing an algorithm to define a rotor, which is constrained under several adjustable variables. I'm just about done, however I cannot seem to get around a problem associated with lofting a series of section curves (which require a "graft" in the pB slot of the orient command). I hope the pictures illustrate the problem well enough. Attached is also the GH file. I am happy to post the Rhino 5 file, if necessary as well. Thanks to everyone in advance for taking the time to take a look, I appreciate it.

Coerte

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Replies to This Discussion

Permalink Reply by Danny Boyes on May 2, 2014 at 9:44am

Use [Shit Paths] before you input to [Loft]

Permalink Reply by Daniel Piker on May 2, 2014 at 9:49am

come on, paths aren't that bad!

Permalink Reply by Danny Boyes on May 2, 2014 at 9:51am

I have 9 minutes to edit it but I think i'll leave it for comedy value

Permalink Reply by Coerte Voorhees on May 2, 2014 at 10:05am

Thanks so much for the speedy reply. I gave it a go, and didn't seem to get a different result. Is there a specific integer that should be plugged into O? If i understood correctly G feeds into D and the output D feeds into loft.

And yes, comedy always welcome and appreciated!

Coerte

Permalink Reply by Hannes Löschke on May 3, 2014 at 6:37am

There are several things wrong with your code, that don't relate to graft/shift.

a) PFrames with N=1 outputs two frames. One for each end of the single (N=1) segment. For a line, those Frames differ only in position. Now you plug those frames into a Vector input. They will be converted from a Plane to a Vector using the Planes normal (Z-direction). The PFrame for a Line, is constructed using only the tangent, which is the same at any position and the dame as the Line's direction vector. Plugging a Line into a Vector input will use that direction by the way...

b) With graft, you match each circle with two orientation vectors giving you two identical circles at the same position. Loft will work but without a visible result. (zero height tube)

c) Without graft, you will get to identical lofts, as both PFrames are matched up against all the levels. That might screw your section. But there are still other weird things happening in your definition....

Here's a modification, that removes the duplicate loft.

Attachments:

RotorAlgorithm_corrected.gh, 26 KB

Permalink Reply by Coerte Voorhees on May 3, 2014 at 7:36am

That did it! Thanks so much! Why didn't I think to just use a vector!? :D

Coerte

Permalink Reply by Hannes Löschke on May 3, 2014 at 7:52am

Happens to even the best. :)

I do try to check and reuse the stuff I already calculated early on. That might decrease readability but increases speed and reduces memory consumption.

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