Hello, I have this sheet of metal in red that needs to be bent from the edges, such that the edge length remains the same, but the sheet is bent. I need to do this since the red creates a draft extension, which is non-manufacturable for now. But if I bend the edes i can manufacture it and unfold it back into form.
Bend Surface by length.3dm (169.8 KB)
I prefer a grasshopper direction because I have multiple panels like this. I have tried using the scale to length using contour lines, but the surface does not remain smooth.
Open for advice.
Surface bend def.gh (90.1 KB)
where is the grasshopper code for it what you made so far
This is my definition so far.
Surface bend def_a.gh (113.6 KB)
i think is this what you looking for
I need the surface to bend, not just the curve. Since this is a 3D curve, if I bend the centre part, it will be impossible to get it back to shape. But the two ends I marked can be
??? you need to bend but it’s bent?
What’s the green surface doing?
Please clarify and illustrate/explain thoroughly what your end goal is 
These shapes have double curvature (not developable) which means when the shape is changed there will be some distortion: a combination of stretching, compressing and shearing. The details depend on the initial and final shapes, and the forming process. That’s how basic geometry works.
I also have been puzzling on your question some time. At last ended up in science on Mercatorprojection Gall-Petersprojection.
So maybe tell us more about “I have tried using the scale to length using contour lines, but the surface does not remain smooth.”
Maybe we can help to bring that to a successful end?
Regards, Eef
