How to make this
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 Presumably you want the surface detail as well rather than just the shape? 
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 yes, I want to use equilateral triangle to make the shape. 
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 Quick study using EEbyRailsToLattice... 
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 @arc said: yes, I want to use equilateral triangle to make the shape. Ah - now that makes for a challenge. 
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 Perhaps Longhand + Winowizer4 ?? 
 Here's a short version - repeat the copying/scaling before Windowizing to get the desired form
 Incidentally I have discovered that by updating offset.rb to RickW's latest v2.1 [for the face-offsetting in my EEbyRailsToLattice tool] it has now broken his RickW's own Winowizer4.rb - the Array::offset is renamed Array::offsetPoints and it is coded a little differently anyway, so it fails - I am in touch with him to resolve this and have updated the zipped set of Extrusion Tools to include a version of offset that now works with 'everything'... 
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 A faster adaptation of your last method would be to use fredo's box twist ruby to twist the 'cone' then unhide all the linework. Works pretty well  
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 Thinking about it 'mathematically'... 
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 i didn't understand the procedure. can anyone please upload a video?  
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