Grasshopper

algorithmic modeling for Rhino

How to make this lines solid mass with the same shape please??

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If by "mass" you mean one "continuous" object try Exoskeleton (VERY tricky) or Intralattice.

If you mean a modular collection of struts and (probably multi adjustable) nodes ... this is not very easy (and rather impossible  to do [in real-life] without coding: member clash detection and the likes). If the nodes are "liquid" (so to speak) is a bit easier (but rather out of question for AEC purposes).

PS: a "variant" of the latter case is, say, a classic MERO KK ball system (i.e. :  ball + sleeve + cone + tube + cone + sleeve + next ball).

Here's a very entry level (rather) naive demo on that matter.

This works (play with Gates) either via ExoW (as I said: out of question for real-life AEC purposes) or via a very rough approximation of a MERO KK system. Clash detection (the most important part) is NOT included. Clash is done via trigonometry and NOT by checking boolean stuff between members. 

Note: ExoW fails frequently by reporting engulfing issues (if they occur ... or ... er ... not).

Other than the clash matter due to the nature of the Voronoi approach is more than probable that short lines may occur (BTW: use proximity for freaky 3d line graphs if you are after real-life AEC stuff).

Of course no structural integrity is assured (triangulation is required: for your envelope captured above > think a W truss that deploys "below" the pieces shown).

Of course for some decorative thingy you may follow the "liquid" node approach (unique items on a per node basis PLUS clash detection required for finding "clean" connecting tubes).

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BTW: If your envelope captured above is actually some kind of AEC "roof" this is what I would highly recommend (replace the cyan hexagons shown with your Voronoi polygons and make a structural capable super light W truss - avoid ultra heavy "single layered" steel connections for reaching lateral stability etc etc ).

If you have (lot's) of cash to spend ... well... there's other far more WOW solutions (say via tensegrity trusses etc etc) but your wallet would suffer (a "bit").

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