Sweep 1 Problem

Replies to This Discussion

Permalink Reply by Riccardo Majewski on October 9, 2015 at 1:20am

Hi

Can you share your definition?

It's hard to help you just by looking at your pic.

Also, probably it's the seam point of the curve.

Your section need to be near, at the same location of the seam point of the rail.

To correct this, find closest point of section on the rail, and use that parameter to correct the seam of the rail.

Then retry with the "new" rail made...

Let us know! Or attach definition with internalized data and/or also .3dm file.

Bye! :D

Permalink Reply by El Mehdi Belyasmine on October 9, 2015 at 8:23am

Hi 

I think the same about seam point of  curve. Here is the definition that i made. I hope it is not a mess for you haha ! 

Thanks a lot really

Best regards

El Mehdi

Attachments:

• Sweep1 rail.gh, 10 KB
• Sweep1 Rail.3dm, 329 KB

Permalink Reply by Joseph Oster on October 9, 2015 at 9:51am

1. I joined the curves coming out of 'Simplify' so you have a single 'Rail' input for 'SubCrv/Sweep1'.
2. I re-parameterized the joined curve and changed the start/end sliders for 'SubCrv' to operate from zero to one.
3. I re-oriented your section curve to the start of the rail (in blue).  To do that, I had to add a 'Point (origin)' param defining where the section curve touched the rail; and I made the assumption that the section's initial orientation was in the 'X' direction (a little hard to be sure about that, esp. when the model is so far from the Rhino origin).

Attachments:

• Sweep1rail_2015_Oct9a.gh, 14 KB

Permalink Reply by El Mehdi Belyasmine on October 9, 2015 at 10:16am

Thanks for this reply. However, i found the unique error which is that the form created along the curve is inverted, i mean that it is the "Mirror" form of the section curve i created ! I have to re-oriente again i guess ? 

Thanks a lot 

Cheers 

Permalink Reply by Joseph Oster on October 9, 2015 at 10:39am

Oops, sorry, just reverse the 'X' vector 'dA' input on 'Orient' - set 'dA' expression to "-x", for example, or reverse the vector before connecting it.

Hang on...  that has some unintended consequences!  Well, I could fiddle around some more but hope you get the idea.  You could move and rotate the original section curve - it doesn't even have to be on the rail anywhere since we are using 'Orient' to put it there and align it with the tangent at the rail's start point.

Permalink Reply by Joseph Oster on October 9, 2015 at 11:07am

Yeah, I finally had to rotate and re-align your section curve in Rhino, now internalized in this version, attached.

Attachments:

• Sweep1rail_2015_Oct9b.gh, 16 KB

Permalink Reply by El Mehdi Belyasmine on October 9, 2015 at 11:17am

Haha Yeah ! As you see, sweep component is really hard to control depend of his temperament today ! 

Great 

Thanks 

Permalink Reply by Joseph Oster on October 9, 2015 at 11:22am

Sweep has a few quirks (like torsion!!!) but it helps to align your section(s) correctly in the first place, and use one rail instead of a list of curve segments.

Permalink Reply by El Mehdi Belyasmine on October 17, 2015 at 7:04pm

A simple question : which method is so simple to make one curve from a list of curve segments ? I Have a curve but grasshopper consider it as a list of curves ! How can i merge theses lines ? thanks :)