octagonal grid projected on surface

Replies to This Discussion

Permalink Reply by Chris Tietjen on April 22, 2011 at 6:07am

Map to Surface

 

Chris

Permalink Reply by Ruby on April 22, 2011 at 6:11am

Did you draw the octagons in rhino? is it possible to draw it in grasshopper? I need the grid cells outline of the octagons and distort them later.

Permalink Reply by Caglar on April 22, 2011 at 6:43am

You can then map to a surface you like.

Attachments:

• octgrid.ghx, 97 KB

Permalink Reply by Ruby on April 22, 2011 at 8:16am

Thank you! ok i think i'm such a noob.. I can't seem to map it properly with 'map on surface'. I created two surfaces in rhino and reference them into the component. but the mapped octagons appear somewhere else instead of the surface..

 

Actually i would prefer the way the attached definition do it with rectangular grids as I will need to distort the grids later by using the surface control points in rhino. But I don't know how to tweak this definition into octagonal grids as I'm not familiar with path mapper.

 

 

Attachments:

• rec grid on surface.ghx, 303 KB

Permalink Reply by Caglar on April 22, 2011 at 8:54am

Does this one work better?

Attachments:

• octgrid2.ghx, 139 KB

Permalink Reply by Ruby on April 22, 2011 at 9:16am

yes! thank you so so much!!

Permalink Reply by Ruby on April 26, 2011 at 1:18am

Hey.. I just realized something. This definition only works on a rectangular-ish surface because it uses SqGrid to divide it. It won't work if I have an irregular boundary surface, the octagons will just spill out.

Is there any way that I could start with Divide Surface so I could fit the octagons into any shape of boundary?

 

Thank you!

Permalink Reply by Danny Boyes on April 26, 2011 at 5:57am

NEW POST: (As I made things too complicated before and didn't even post the ghx)

Here's a definition which will cope with a straight edged (when looking down XY plane) 4 sided trimmed srf like the image above. It will also cope with curvature on that surface. You will need to have Weaver Bird installed (http://www.giuliopiacentino.com/weaverbird/)

The Points in green are the original untrimmed surface

 

Attachments:

• octgrid_StraightEdgeTrimSrf.ghx, 315 KB

Permalink Reply by Dimitri Nikitin on April 26, 2011 at 6:32am

Hi, me again :)

... Dannys definition is cool, but I'd rather use simple second mapping...

..use same original definition by Caglar, just add another cycle of mapping... the rectangular surface with regular octagons will be there only for default mapping to irregular boundary (so you can hide it)... then just remap curves from first or second surface to the curved one... you'll need just 2 more components to add to the original definition..

Permalink Reply by Danny Boyes on April 26, 2011 at 6:42am

Ah! There I was thinking it was all about trimmed surfaces

Permalink Reply by Dimitri Nikitin on April 26, 2011 at 6:53am

yeah, it's a good point- my sugestion only works if you create irregular boundary surface from 4 corners or by deformation of rectangular surface (without trimming it)..

Permalink Reply by Ruby on April 26, 2011 at 7:53am

Thanks Danny and Dimitri! When I hover my mouse to the MaptoSurface component, it says "map a curve onto a surface via control points". So, what I really really had to do after all was just simply 'rebuild' the control points of the surface in rhino, turn them on, and distort the surface! I'm so happy that I don't need to use gh to solve this. lol