Two rail sweep



i uploaded two images The first image is what I am trying to achieve with a two-rail sweep, but the sweep between the cross section is curved; I required a straight line instead of a curved one.

The other thing needs suggestions on how I can achieve the design, as in the first images.
thank u

Why are you choosing to use curved lines between your rails?—Mark

I am using two straight lines as rails and 2 cross sections but when sweep 2 rails.
The the shape is not straight as u see in the image

I don’t think you need 2-rail sweep for this.

Your image is not very clear. It looks like bumps on top of a planar surface.
This is how I would make the bumps.
bumps.3dm (60.8 KB)

To see how its made select everything and run explode and untrim…

Upload a .3dm file with an example of your geometry. Then someone may be able to provide a more specific answer.

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Thanks for your time and effort, and yes, I want similar results. Did you use curve networks?
I am uploading a new picture. I hope u understand what I needed.

Thanks for your interest in the post. I am including images as examples of the outcomes that are required.

Can you share your file?
I think you have the wrong curves

Hi pal, I do not have the file for the above image. I received it and need to model it in Rhino 3D.

It looks to me that the bumps are all sorta pyramids each with 4 planar sides.
The trick is to figure out the dimensions of the 4 corners of the footprint of a typical pyramid and its peak.

In the enclosed file the green points are the corners and the red point is the peak used to make 4 planar surfaces. Then I rounded the peak a little and trimmed and joined.
Each row of bumps looks to be a repeating pattern of the original. Some of the rows look like mirror images of the first row. The distribution of rows looks a bit random.
bumps2.3dm (392.2 KB)

2 Likes

I really like this pattern so i thought i would give it a go after a 2007 bottle of Cotes du Rhone and a nice rack of lamb ribs and oysters before that…

Complex pyramids 0.2.gh (36.3 KB)

image

I know it’s not sweeps (Apologies, im having also hard times with those) but I got some nice surfaces almost without trying that look like sweeps. As Im expanding the pyramid nodes (into more corners) adding variations the 4 point surface front right is no longer possible.

the middle shape would be nice to fit your surfaces… (my way of interpreting it - now that I interpret better your shapes)…

But I thought this would be a nice variations on the theme. My question is how to surface ‘easier’ by finding the poins automatically… if possible. I see how to kind of but i dont see how to! (find all points that can make a surface in the future solid. The bottom points are easy. The top points a bit less, the face edges - how can you mesh that in as few faces as possible?

Each time it’s find the points to merge into a surface… Tedious… And error prone! Althought the waves are nice! Any tips welcome!