In Rhino it is possible to (partly) control how each of the 2 rails are swept by adding the so called slashes. How to do it in GH? I am trying to split in several sweeps trying using the generated end of sweep profile for the next one but this seems to cause a recursion error. Attached what I wou…

Loft could be used too to create the surface, like this, but it’s slightly different from the sweep2 one: Swep2-slash-v1_re3.gh (20.0 KB) [Canvas at 15;07;45] But by adding more profile/shape curves the differences get less noticable and network srf could be an option too. Swep2-slash-v1_re4.gh …

I’m not exactly clear as to what you want the end result to be. Can you post your GH definition with internalised geometry?

YY-v2reduced.gh (8.7 KB) ! [sweep2] gh generator attached and picture of difference between GH and Rhino generations the profile generated is obviously different as can be seen on the right view added now also [Annotation 2020-08-20 165634] Frç

Grasshopper probably refits rails in the component, in Rhino it’s an option: [RefitRails2] (gh surface shown shaded)

Thanks for investigating but not sure what refit does and really changes here. Btw this is not avail in Rhino 5? Nevertheless I painfully but still :slight_smile: just managed to do a GH (attached) which makes slashes (probably not optimised programming…). Swep2-slash-v1.gh (17.4 KB) [Annotation 20…

I am curious how you do this animated image ? this can be very helpful :slight_smile:

Just use the original rails and flatten the input of the new profiles you created. Swep2-slash-v1_re.gh (17.3 KB)

Thanks, this is simpler indeed (although losing the end tail) but I don’t understand how the flatten works here.

You can see the difference it makes in the animation, as the surface approaches the tail it’s similar to as you describe earlier. The fact that the gh component doesn’t have this as an option suggests to me it’s true by default. Sorry, can’t help with R5, but the gif is made with Screen2gif, a neat…

And the use of the solution :slight_smile: [image]

You could also explore loft options, that could help rectify any problems. In the initial image you posted, the rail curves look different to each other

Grasshopper sweep 2 rails using slashes

Grasshopper

danielbent (Daniel) August 21, 2020, 7:44pm 17

Ah damn, then the method is not aviable in RH5, sorry.

According to this old thread SweepTwoRail Class should work in RH5, but it misses the inputs for start and end points so maybe the loft way is a proper workaround for RH5.

https://developer.rhino3d.com/api/RhinoCommon/html/T_Rhino_Geometry_SweepTwoRail.htm

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Grasshopper sweep 2 rails using slashes

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