how to make a patern to uppolster of a 3D surface

Who can help me with my quest, i'm trying to make a patern of a surface

this is a surface made from points /curves

these forms ( seats) are scans of a ( disabled) person, who's depending on a perfect fit in his / her wheelchair

i am including a 3Dm, I've made a patern in Rhino whith the function "flatten" but ther's no "flatten " function in Grasshopper

i hope there's anyone who can help me create the same in a useful "grasshopper"

Hopefuly is there a sullution to my quest

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making a Patern.3dm, 933 KB

Replies to This Discussion

Permalink Reply by David Rutten on September 5, 2016 at 10:13am

What exactly are the steps you take in Rhino? It's true that there is neither an Unroll nor a Flatten component in GH that mirror the Rhino commands. Flattening in GH means something very different and won't help you here. However if you can break your process into small enough steps, it may be possible to encode what you are after in GH using the available functionality.

Permalink Reply by johan noordhoek on September 5, 2016 at 12:29pm

the steps are simpel :

1 slice the surface into strips by: split surface with isocurve ( number of splits bepending on dificulty surface)

2 flatten sliced strips with "flatten"

my idea was that when i cut-out the slices en shew them together,..... i thought to have an perect partn to upholster te surface ( these are millled out,out of foam, en get a backing off wood)

hopefully you'le understand me.....my englisch writing is'nt the best,sorry

thanks for your help

Permalink Reply by johan noordhoek on September 5, 2016 at 12:32pm

Permalink Reply by David Rutten on September 5, 2016 at 3:52pm

I think Hyungsoo's suggestion is the closest you'll get to a solution without a significant amount of custom coding.

Permalink Reply by David Rutten on September 5, 2016 at 3:56pm

Incidentally doesn't it make more sense to split the surface using geodesics rather than isocurves?

Permalink Reply by johan noordhoek on September 6, 2016 at 4:37am

I'me sorry i am quite a new player ....can you tell me the difference?

i,d used the normal function in Rhino, but if you can teach me annother way...please

Permalink Reply by David Rutten on September 6, 2016 at 6:27am

Isocurve directions are dictated by the UV direction of a surface, whereas geodesics are dictated by the curvature and shape of a surface. Basically, a geodesic connects two points on a surface using the shortest possible curve.

With geodesics, there's a certain amount of symmetry on either side that is lacking when using isocurves, and this symmetry may make fabrication easier. However, geodesics tend to behave fairly erratically when the underlying surface gets too bumpy, so it's not a guaranteed better approach.

Permalink Reply by johan noordhoek on September 8, 2016 at 1:27am

Thx...... is this the reasen why some "ruled surface's" are dubbeling up on itself, instead of a flat surface between two lines....?

Permalink Reply by johan noordhoek on September 8, 2016 at 1:44am

other Question: have you ever heard of triing to make a surface like i've shouwed you from a scan ( stl of PLY)

i've made a GH what projects lines onto the scan horizontaly and verical

these project line's "rebuild" in Rhino and then make a surface in Rhino with "curve network"

but it isn't ideal to work with in a cadcam program....

maybe you've heard of somthing like it ?

Permalink Reply by Hyungsoo Kim on September 5, 2016 at 10:58am