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GH vertical polylines

how to arrange a tree in order to get all the points that have the same x-value in the same branch? and in each branch how to class the points in an increasing order in fonction of their appartenance of they mother-polyline?

here is the rhino file

here is the gh file

Common data

here are the last CAD drawing (rhino 4 files):


be aware of:


–> if you want to be sure of the scale,  check the layer “_NOTES” / sub layer “_SCALE” or “_LAYER ON


–> dont know how to get rid of it on rhino,  the only layers that i hav redrawn for the moment and are 100% clean are the layers  called “_STRUCTURE” (in evey files)

CS_Glass sponge_Introduction

Our first presentation is mainly a synthesis of the following article:

Hierarchical assembly of the siliceous skeletal lattice of the hexactinellid sponge Euplectella aspergillum/ Journal of Structural Biology 158 (2007), pages 93–106.

Most of the following informations and illustrations are directly taken from it.

For the GH definition click here

J Struct Biol. 2007 Apr;158(1):93-106. Epub 2006 Nov 10.

Hierarchical assembly of the siliceous skeletal lattice of the hexactinellid sponge Euplectella aspergillum.

Weaver JC, Aizenberg J, Fantner GE, Kisailus D, Woesz A, Allen P, Fields K, Porter MJ, Zok FW, Hansma PK, Fratzl P, Morse DE.

Department of Molecular, Cellular and Developmental Biology, Institute for Collaborative Biotechnologies, and the Materials Research Laboratory, University of California, Santa Barbara, CA 93106, USA.

Daniels faculty of Architecture, Landscape, and Design

The strategy of the faculty’s new façade is to add new program above the existing structure while developing a cladding system and an internal organizational strategy that will integrate the new and the old. The new cladding is a glass curtain wall that comes around the existing.

The following images explain the construction of the overall grid pattern with GH:

01 Facade drawing

02 Lines to set as curves in GH

03 Spacing between the cables – Narrow-medium-Wide

04 Serie of Narrow cables

05 Serie of midspaced cables

06 Serie of Wide spaced cables

07 Division of the space between line 1 and 2

08 Serie of Horizontals with some excluded

09 And finally the overall grid patern

building info source :

Esquisse and reflexion

Giving the piraeus tower a new life will legally only be possible if a new fire emergency path is added to the existing building. In order to do this, it will be certainly faster and cheaper to build an additionnal extrernal structure than to cut in all existing slabs.

This is a fonction that can take the new façade. That means, the new “façade” should not only be a cladding that will provide coverring (water/sun) and openings (views/fresh air), but it should also contain a vertical circulation and access(es) to the ground level.

Another thing that will emphasize the life in this building will be to activate it with an additionnal program. So what should this additional program be? In Piraeus area there are three main streams of activity: the offices, the commerces and the tourism activity. The program that is allready planed in the tower is offices and commerce. So, related to the tourism activity, the proposal for the additionnal program will be a tourism office and an hotel.

Piraeus tower’s new skin will theirfore be a an external structure, added to the existing building that will expand to the rest of the building as a simple cover. Something light, at least lighter than the existing, that will invade the existing. Like a plant growing on a rock, it should express something that is hanging close but that has also its own strength, capable of taking the people on the ground level and bringing them to the top it should also express this flow by the position of the new volumes.