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Mini-challenge

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  • T Online
    TIG Moderator
    last edited by 30 Apr 2012, 11:07

    @pbacot said:

    Well if you had a true arc or circle you could find your exact intersection points. But there are no true circles in SU.
    My 'TrueTangent' tools have various options, in this case you could place a cpoint exactly at the 'true-intersection' of two SUpArcs...


    AccurateRoatationWithTrueTangents.skp

    TIG

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    • P Offline
      pilou
      last edited by 30 Apr 2012, 11:19

      @unknownuser said:

      it will never be accurate (second screen shot). The cursor is "sliding along" the guide and does no give an accurate inference.

      ๐Ÿ˜ฎ ๐Ÿ˜ฎ ๐Ÿ˜ฎ
      That will say that any rotation can be made precisely? ๐Ÿ˜ฒ ๐Ÿ˜ฒ ๐Ÿ˜ฒ

      You can make zoom during the process!
      And re look my last image, there is green point that indicate that the snap is done! ๐Ÿ˜‰
      And a red one will be drawn at the end of the last snaping on the group!

      What do you want more accurate ? ๐Ÿ˜ฒ

      big_snap.jpg

      I have verified! Seems you right!
      That is very ennoyous and want to say that any constructions made with align / Roation are false! ๐Ÿ˜ฒ

      Another headache to resolve! ๐Ÿ˜ฒ

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

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      • D Offline
        Dave R
        last edited by 30 Apr 2012, 11:40

        Jeff, I've had to draw diagonals like this a number of times and not found an elegant solution. It's always been via brute force. I forgot about TIG's True Tangents.

        Etaoin Shrdlu

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        • T Offline
          thomthom
          last edited by 30 Apr 2012, 11:42

          @dave r said:

          Jeff, I've had to draw diagonals like this a number of times and not found an elegant solution. It's always been via brute force. I forgot about TIG's True Tangents.

          Pilou's method was quite easy and simple. And also accurate!

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

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          • D Offline
            Dave R
            last edited by 30 Apr 2012, 11:47

            @thomthom said:

            @dave r said:

            Jeff, I've had to draw diagonals like this a number of times and not found an elegant solution. It's always been via brute force. I forgot about TIG's True Tangents.

            Pilou's method was quite easy and simple. And also accurate!

            Yes, his way works, sort of. The second rotation is not perfectly accurate, though. I meant to simply draw it in place.

            Etaoin Shrdlu

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            • T Offline
              thomthom
              last edited by 30 Apr 2012, 12:20

              @dave r said:

              The second rotation is not perfectly accurate, though.

              Seemed to snap perfectly in my test... what am I missing?

              @dave r said:

              though. I meant to simply draw it in place.

              Ah - no post-cropping?

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

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              • O Offline
                oganocali
                last edited by 30 Apr 2012, 12:36

                Nice challenge by the way, at first I thought this should be easy but then...

                You can also perform the rotation as a tangent to the drawn arc, (referencing the vertices on the arc). Of course it is not exact but the angular error is vanishingly small (approximately a^2*t/l ; t,l thickness and length of the rail, a is angular resolution on the arc (total angle/number of segments) in radians)). The final rotation accuracy increases with the square of the number of segments on the arc. After a few hundred segments SU makes the structure ideal at explode.
                slicer.png
                Ogan

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                • D Offline
                  Dave R
                  last edited by 30 Apr 2012, 12:58

                  Thomas, see Pilou's last post in this thread.

                  Etaoin Shrdlu

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                  • T Offline
                    thomthom
                    last edited by 30 Apr 2012, 12:59

                    @dave r said:

                    Thomas, see Pilou's last post in this thread.

                    Wasn't that related to Gaieus' guideline experiment?

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

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                    • P Offline
                      pilou
                      last edited by 30 Apr 2012, 13:02

                      The thing absolutly crazzy is that the Rotation tool
                      seems accept just the base alignement as only good alignement! ๐Ÿ˜ฒ ๐Ÿ˜ฒ ๐Ÿ˜ฒ
                      I am totally depited! ๐Ÿ˜ฎ

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

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                      • D Offline
                        Dave R
                        last edited by 30 Apr 2012, 13:03

                        I get the result he shows in his close up when I try to use his method.

                        Etaoin Shrdlu

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                        • T Offline
                          thomthom
                          last edited by 30 Apr 2012, 13:04

                          I see the issue now. doh!
                          ๐Ÿ˜•

                          ...and I thought I had gotten peace at mind... ๐Ÿ˜ž

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

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                          • T Offline
                            thomthom
                            last edited by 30 Apr 2012, 13:05

                            So how do you calculate it?

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

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                            • T Offline
                              thomthom
                              last edited by 30 Apr 2012, 13:26

                              arg... I keep wanting to make quide circles... I see how difficult this is with native SketchUp now...

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

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                              • D Offline
                                Dave R
                                last edited by 30 Apr 2012, 13:35

                                I'm not sure how you'd calculate it. I think the only dimension you know is the width of the board. the length of the miter and the length between ends will change as the angle changes due to changes in the spacing between posts and the height of the posts. And you don't know any of the angles either.

                                Etaoin Shrdlu

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                                • T Offline
                                  thomthom
                                  last edited by 30 Apr 2012, 13:39

                                  • Width of the board
                                  • Diagonal of the board

                                  Surely this should be something to work on?

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

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                                  • D Offline
                                    Dave R
                                    last edited by 30 Apr 2012, 13:42

                                    But you don't really know the length of the diagonal of the board when the miters have been cut. And the overall length of the board is immaterial.

                                    If you working in real wood, you would get an estimated length so you know the piece of wood you offer up is plenty long. You'd nail it in place and cut the ends off flush with the posts.

                                    Etaoin Shrdlu

                                    %

                                    (THERE'S NO PLACE LIKE)

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                                    • T Offline
                                      thomthom
                                      last edited by 30 Apr 2012, 14:01

                                      @jason_maranto said:

                                      This is really easy with the native tools -- here's a short tut file: [attachment=0:3gkxsinp]<!-- ia0 -->challenge.skp<!-- ia0 -->[/attachment:3gkxsinp]

                                      Best,
                                      Jason.

                                      How do you place the horizontal guides such that you get the fixed width of the diagonal board?

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

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                                      • T Offline
                                        thomthom
                                        last edited by 30 Apr 2012, 14:02

                                        Looking at it, it's just as if you skewed a 0,50m board - which is not correct.

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

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                                        • jason_marantoJ Offline
                                          jason_maranto
                                          last edited by 30 Apr 2012, 14:03

                                          This is really easy with the native tools -- here's a short tut file: challenge.skp

                                          Oh, I see why this might be a challenge -- you want a specific width to the crossboard... give me a sec.

                                          Best,
                                          Jason.

                                          I create video tutorial series about several 2D & 3D graphics programs.

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