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    Mini-challenge

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    • jeff hammondJ Offline
      jeff hammond
      last edited by

      @andybot said:

      How is this different from gilles? (and I posted a similar one a ways back once I saw gilles method - by drawing a perpendicular to the diagonal). This still has an issue of not aligning precisely to the tangents. You can double-check it easily with TIG's true tangent ruby.

      ok.. so it's not different.. it's just faster to draw it using a modified version of Moujiik's..

      but.. here's something i figured out is different (and it's the reason you were able to get a perfect .000000" measurement in your file (which i missed until now)).. we (you and i at least) are doing something different than others in the thread.. we're working in inches..

      .000001" is a lot more of a tolerance than .000001mm

      so doing gilles' method in inches -- as long as your board doesn't get too wide, will in fact give perfect sketchup results (meaning smthg like 10.000000") even though it's still not perfect where as working in mm will still show the error..

      so this is sort of interesting to say the least.. maybe because i never took the time to realize this:

      **.000001 millimeters = .00000003 inches (that's 8 decimals)**
      

      so that means, anyone getting this within .000020mm has surpassed the accuracy which is possible with inches in sketchup..

      dotdotdot

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      • andybotA Offline
        andybot
        last edited by

        Actually, the only reason I was using inches is because it's the native unit for SU. I was thinking I would avoid any possible "rounding to metric" errors. But of course, it all depends on scale, and mm will be a smaller scale giving a higher precision. In the end, checking against true tangent will show the error in any of the cases. (Except now I'm paranoid, maybe true tangent has some built-in approximation as well 😲 πŸ˜• )

        http://charlottesvillearchitecturalrendering.com/

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        • jeff hammondJ Offline
          jeff hammond
          last edited by

          @mac1 said:

          ..IMHO you really don't need SU.

          you're right …

          [flash=853,480:3ax8n44e]http://www.youtube.com/v/ww17dNJt_LQ?version=3&hl=en_US&rel=0[/flash:3ax8n44e]

          … but where's the fun in doing it that way? πŸ˜„

          [actually, the second method in the video shows something that might make a good ruby.. 2pt orient with 1D scaling]

          dotdotdot

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          • jeff hammondJ Offline
            jeff hammond
            last edited by

            @andybot said:

            Actually, the only reason I was using inches is because it's the native unit for SU. I was thinking I would avoid any possible "rounding to metric" errors. But of course, it all depends on scale, and mm will be a smaller scale giving a higher precision. In the end, checking against true tangent will show the error in any of the cases. (Except now I'm paranoid, maybe true tangent has some built-in approximation as well 😲 πŸ˜• )

            yeah.. i'm sure true tangents would eventually show an error.. it just depends on how many zeros you can put after the decimal point..

            which is basically what i'm getting at here.. if the people working in mm were limited to 4 decimal places, most of their results (the people using a gilles hybrid) would be showing a perfect measurement across the boardwidth even though we can tell, geometrically, there should be an error..

            i think this thread is driving into some weird territory.. we're straddling sketchup's tolerances at amounts so small, it's hard to even imagine.. if this thread keeps going, we'll probably end up pinpointing the exact place where sketchup decides "this is ok.. and this is not ok"

            [edit.. or actually, i guess that point is somewhere around 3 one-hundred-millionths of an inch πŸ˜†]

            dotdotdot

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            • gillesG Offline
              gilles
              last edited by

              I think I've found a very easy way.
              Show you later, no time yet.

              " c'est curieux chez les marins ce besoin de faire des phrases "

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              • jeff hammondJ Offline
                jeff hammond
                last edited by

                @gilles said:

                I think I've found a very easy way.
                Show you later, no time yet.

                sweet!

                .

                dotdotdot

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                • thomthomT Offline
                  thomthom
                  last edited by

                  Would be interesting to hear what the SketchUp team thinks of this challenge. ..too bad they are rather busy atm...

                  Thomas Thomassen β€” SketchUp Monkey & Coding addict
                  List of my plugins and link to the CookieWare fund

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                  • pilouP Offline
                    pilou
                    last edited by

                    SUspense! πŸ’š

                    @unknownuser said:

                    actually, the second method in the video shows something that might make a good ruby.. 2pt orient with 1D scaling

                    And the same can make as option also Uniform or Stretch & Copy for the same price πŸ˜‰ (Moi's function Line-Line)

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

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                    • TIGT Offline
                      TIG Moderator
                      last edited by

                      My True Tangent's 'True Intersection' tool uses Ruby's float and Math's functions, so it's probably as accurate as Sketchup itself in its calculated answers.
                      Sketchup has to have tolerance to assume two points are 'equal' because most likely they'll have some tiny differences in the 'zillionths'.
                      Any computational answer will never be entirely accurate - just accurate enough.
                      Because we are using sine/cos/tan/roots/pi etc we cannot expect a 'perfect' result.

                      The calculated solution should be as accurate as needed to get a 'non-rounded' dimension at the limit of Sketchup's reporting.
                      Unfortunately the drawn solution's accuracy is slightly worse than Sketchup's reporting limit and so can show a tiny difference - the fact you can't even 'see' this in the real world is annoying.
                      With my rotation of the ends method gives a good approximation in one go, repeating it gets even nearer, and it might get so near that Sketchup then says it's 300.000000mm rather than 299.999999mm but it's a wasted effort in 'reality'.

                      TIG

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                      • gillesG Offline
                        gilles
                        last edited by

                        Here we go!


                        Mini-challenge_Teaser.png


                        Mini-challenge3_v6.skp

                        " c'est curieux chez les marins ce besoin de faire des phrases "

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                        • pilouP Offline
                          pilou
                          last edited by

                          Thx for the V6 πŸ‘
                          Must study your center rotation method because Step 4 is some tricky πŸ˜„

                          FOr another method
                          I have thinking of use the offset for don't use rotation πŸ˜„

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

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                          • TIGT Offline
                            TIG Moderator
                            last edited by

                            Bravo Gilles !

                            At last a drawn solution [without plugins] that does indeed work with no tolerance issues !
                            Your very clever trick is getting the rotated 'end' to align with the 'long side' of its 'sibling' during the edit, it is effectively snapping to itself so the alignment is perfect... then both of the sides are parallel and the two ends remain the exact set dimension.
                            😎

                            TIG

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                            • thomthomT Offline
                              thomthom
                              last edited by

                              ❓
                              I can't make it snap to the endpoint when I rotate...
                              ?

                              Thomas Thomassen β€” SketchUp Monkey & Coding addict
                              List of my plugins and link to the CookieWare fund

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                              • TIGT Offline
                                TIG Moderator
                                last edited by

                                You don't need to snap to a point, click on the originally horizontal guide line, then it suggests an inference 'parallel to edge outside active', when you are approximately over the long edge in the sibling instance [as the ends are approximating to 'square'], click to accept that.
                                πŸ’­
                                EDIT: As Pilou shows in his screenshot - pipped at the post!

                                TIG

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                                • pilouP Offline
                                  pilou
                                  last edited by

                                  Seems there is not #4, ( there are two #5) and I can't obtain your last result 😞
                                  I have snap on Parallel but not at "point"
                                  where.jpg

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

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                                  • gillesG Offline
                                    gilles
                                    last edited by

                                    @unknownuser said:

                                    I can't make it snap to the endpoint when I rotate...

                                    Did you take the alignment point at the end of the line?

                                    " c'est curieux chez les marins ce besoin de faire des phrases "

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                                    • oganocaliO Offline
                                      oganocali
                                      last edited by

                                      In Step 5 while snapping, my sketchup refuses to snap "exactly" on the endpoint no matter where I pick, are you sure it is exact?

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                                      • gillesG Offline
                                        gilles
                                        last edited by

                                        I change the component axis location then it works better even with the end point.


                                        Mini-challenge3-2_v6.skp

                                        " c'est curieux chez les marins ce besoin de faire des phrases "

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                                        • pilouP Offline
                                          pilou
                                          last edited by

                                          @unknownuser said:

                                          Did you take the alignment point at the end of the line?

                                          The horizontal point of the end of the line don't work (on the right of the last red point on the blue line)

                                          OK that works only if you take the click point under your arrey drawing! Very curious!!! 😲
                                          Luck ? πŸ˜„


                                          work.jpg

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

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                                          • thomthomT Offline
                                            thomthom
                                            last edited by

                                            Right - now I see that it infer from itself. But I get no snapping from the end-point.

                                            Thomas Thomassen β€” SketchUp Monkey & Coding addict
                                            List of my plugins and link to the CookieWare fund

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