unroll a surface tried python fabtools, can i have some help pls!??

y I can non unroll my surface?? How should I do a surface from the parametric ellipse and arcs to make it work? thank you in advance :)

Replies to This Discussion

Permalink Reply by Marios Tsiliakos on October 17, 2016 at 6:56am

You have to further subdivide this trimmed surface in order to unroll it.

refer to the attached.

Attachments:

161017_unroll_ellipse_patch.gh, 12 KB

Permalink Reply by Alexia Ch on October 17, 2016 at 7:09am

I think there is a problem with the surface I generated at the beging since it is not exact on the ellipse. Do you know a mode to do a parametric paraboloid elliptic?

Permalink Reply by Alexia Ch on October 17, 2016 at 7:12am

this is the initial file of the surface

Attachments:

vorronoi grasshopper paraboloide.gh, 12 KB

Permalink Reply by Marios Tsiliakos on October 17, 2016 at 7:42am

But Wolfram does.

Attachments:

161017_unroll_ellipstical_paraboloid.gh, 11 KB

Permalink Reply by Alexia Ch on October 17, 2016 at 8:16am

:) I have already seen that and the solution I found even with the arcs non parabolic seemed to work fine but I can not make e good surface from it

Permalink Reply by Marios Tsiliakos on October 17, 2016 at 8:57am

what does "good surface" means in this case?

I'm slighlty confused here. The title of the thread is howto unroll. Not how to generate "good surfaces".

Ta,

Permalink Reply by Alexia Ch on October 17, 2016 at 9:38am

I think the problem I don't know if I'm wrong since it's a patch surface and it doesn't match exactly with the initial ellipse maybe it's that the mistake and it doesn't unroll. maybe a network surface it's better as a construction and it can unroll more easily.

Permalink Reply by Marios Tsiliakos on October 17, 2016 at 10:08am

The elliptic paraboloid is not a developable surface (at least not to my knowledge). So, if you want to unroll it in one sheet, that's never gonna happen.

That the reason you've to discretise it, and unroll the discrete parts.

Hope this makes sense

Best.

Permalink Reply by Alexia Ch on October 17, 2016 at 11:05am

Thx I'll try another way to use voronoi on the surface then. :)

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