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    Geodesic roof help

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    sketchup
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    • pilouP Offline
      pilou
      last edited by

      @unknownuser said:

      is a nightmare

      Yes if you want same triangle windows !

      Frenchy Pilou
      Is beautiful that please without concept!
      My Little site :)

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      • pilouP Offline
        pilou
        last edited by

        Another approach 😉

        http://forums.polyloop.net/picture.php?albumid=23&pictureid=655

        Frenchy Pilou
        Is beautiful that please without concept!
        My Little site :)

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        • TaffGochT Offline
          TaffGoch
          last edited by

          disturbed13,

          The roof sections that are in your model are referred to as "barrel vaults."
          Barrel vault roof sections
          The problem, which you've demonstratively-realized, is that equilateral triangles can not be tiled to fit a 135° "bend" in the barrel-vault curved roof.
          135° barrel-vault intersection
          Even if the intersection was 120°, which would, at "first blush," fit the equilateral triangle edge, can NOT be tiled with equilateral triangles. The reason is that, on a cylinder, tiled equilateral triangle edges follow a helix, not the planar intersection line between two adjacent cylindrical roof sections. In the image below, you can see the spiral helix path traced by the equilateral triangle edges.
          120° barrel-vault intersection
          If you wanted to employ equilateral triangles, making all the windows the same, it can not be done. There's no way to get around the mathematical facts of the intersection of cylindrical barrel-vaulted roofs. (Actually, even if they were NOT cylindrical, you can't get a planar-intersection arc to fit equilateral triangles.)

          Did you want to proceed with triangles that are not equilateral?

          Isosceles triangles might/should work, where windows in each ROW share the same specs.

          -Taff

          "Information is not knowledge." -- Albert Einstein

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          • D Offline
            disturbed13
            last edited by

            i had a hunch
            i call it a variable pitch roof
            from the edge to the center the pitch is as follows
            1/3 > 1/4 > 1/5 > 1/9

            i would really like to know the math/method that is used to figure out how to do it
            as i have several more roofs to draw
            and other parts of my design might get the triangle treatment

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            • D Offline
              disturbed13
              last edited by

              the whole point was to use as much of the same shape as possible to keep $ down
              i welcome any guidance you can offer

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              • TIGT Offline
                TIG Moderator
                last edited by

                If the roof is a simple barrel-vault with equal length segments in its arc, then for a simple form you only need two main component 'panels' that are 'isosceles triangles' - one with it's point up-slope [designed in profile to let water run off its low-point 'sill'] and the other with its point down-slope [designed to let water run off its low-point apex].
                These frames are then arranged radially in section, around the cross-section arc's nodes.
                Purpose made cover flashings weatherproof the roof at the panels' junctions.
                How the frames are supported or are made self-supporting is a major issue not yet addressed.

                As well as the two 'standard panels' you'll need to consider how you terminate any verges, and junctions...
                At each 'verge' you'll need '1/2' frames of the two main-types used in alternating rows, the opposite 'verge' will need a 'half' frame made from a handed version of the first verge's 1/2 frames, all depending how the pattern works across the eaves.
                At junctions between barrels or barrels and abutments etc things become complicated !
                Unless you contrive the roof so that where two 'barrels' intersect so that the angles are neatly formed at the diagonals of the panels' junctions you'll doom yourself to have to make many variants of infill part-panels...
                At least with a geodesic dome you repeat most panels and only get convoluted where it's cut at the ground, doorways are added etc - and geodesic spheres are even simpler, especially if you only omit sets of whole panels to allow access etc...


                Capture.PNG

                TIG

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                • D Offline
                  disturbed13
                  last edited by

                  well i figured it out

                  http://i107.photobucket.com/albums/m294/hedoe/roof4ftarchmk1_zpsdaeb0a94.jpg

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                  • olisheaO Offline
                    olishea
                    last edited by

                    @unknownuser said:

                    Another approach 😉

                    http://forums.polyloop.net/picture.php?albumid=23&pictureid=655

                    how i made this a long time ago!

                    http://i654.photobucket.com/albums/uu269/olishea/speed2.jpg

                    oli

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                    • D Offline
                      disturbed13
                      last edited by

                      and the finished product

                      http://i107.photobucket.com/albums/m294/hedoe/buildmk3with4ftarchedroof_zps25093787.jpg

                      i have 57 solar panels up top as well
                      the passive solar shades are turned at a 30 degree
                      and when compaired to the vertical
                      they provide 61% more shade on the house

                      if anyone wants ill post a thread on how to make the windows in that area

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                      • TaffGochT Offline
                        TaffGoch
                        last edited by

                        That triangular-windowed roof makes a grand addition to the design.

                        It could, just as easily, have been composed of rectangular windows, with triangular windows at the intersections.

                        Have you compared the appearance of triangular vs. rectangular?

                        -Taff

                        (Make no mistake, I'm a fan of triangulated constructs.)

                        "Information is not knowledge." -- Albert Einstein

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                        • jeff hammondJ Offline
                          jeff hammond
                          last edited by

                          @disturbed13 said:

                          well i figured it out

                          nice
                          good job 👍

                          dotdotdot

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                          • D Offline
                            disturbed13
                            last edited by

                            @taffgoch said:

                            That triangular-windowed roof makes a grand addition to the design.

                            It could, just as easily, have been composed of rectangular windows, with triangular windows at the intersections.

                            Have you compared the appearance of triangular vs. rectangular?

                            -Taff

                            (Make no mistake, I'm a fan of triangulated constructs.)

                            it would seem like rectangles would make the number of different parts increase
                            which would cause the cost to rise as well
                            i might take a look at it later
                            but for now im happy with the triangles

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