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    Geom::Transformation.new(pt, xaxis, yaxis)

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    • thomthomT Offline
      thomthom
      last edited by

      yes - I tried that - but it isn't what I want though. as I want to modify the existing position, rotation and scaling - offsetting the position and rotation.

      So maybe I'm using the wrong method, but then I'd still like to understand what this one does and what it is intended for.

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

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      • C Offline
        cjthompson
        last edited by

        I'm pretty sure it is the same as .axes, but it crosses the Z axis automatically.

        Can you tell us what you are trying to do in particular, or are you just curious?

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        • thomthomT Offline
          thomthom
          last edited by

          I have a specific case - and I'm curious. I'll upload a case sample.

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

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          • M Offline
            MartinRinehart
            last edited by

            Try Chapter 16. There is almost never a reason to use a Transformation directly. Just move, rotate and scale as you wish.

            Author, Edges to Rubies - The Complete SketchUp Tutorial at http://www.MartinRinehart.com/models/tutorial.

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            • thomthomT Offline
              thomthom
              last edited by

              transformation.png

              Here is what I tried: use this transformation type to place the car on the face under it.
              The data I have:

              • instance origin

              • instance x and y vector

              • new origin

              • new x and y vector

              Could this transformation be used for this?

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

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              • C Offline
                cjthompson
                last edited by

                If you don't care about scale, this should work fine, although it may flip the car upside down if the expected z axis does not correspond with the input axes:
                instance.transformation = Geom::Transformation.new(newOrigin,newXAxis,newYaxis)

                I would suggest using something like this (untested):

                
                trans = instance.transformation
                scales = [trans.xaxis.length,trans.yaxis.length,trans.zaxis.length]
                inputX.normalize!
                inputY.normalize!
                inputX = inputX * scales[0]
                inputY = inputY * scales[1]
                newTrans = Geom;;Transformation.axes(newOrigin,inputX,inputY,face.normal * scales[2])
                instance.transformation = newTrans
                
                
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                • thomthomT Offline
                  thomthom
                  last edited by

                  @cjthompson said:

                  If you don't care about scale

                  I do. 😉

                  @cjthompson said:

                  although it may flip the car upside down if the expected z axis does not correspond with the input axes:

                  Yup - noticed this to.
                  😄

                  @cjthompson said:

                  I would suggest using something like this (untested):

                  
                  >     trans = instance.transformation
                  >     scales = [trans.xaxis.length,trans.yaxis.length,trans.zaxis.length]
                  >     inputX.normalize!
                  >     inputY.normalize!
                  >     inputX = inputX * scales[0]
                  >     inputY = inputY * scales[1]
                  >     newTrans = Geom;;Transformation.axes(newOrigin,inputX,inputY,face.normal * scales[2])
                  >     instance.transformation = newTrans
                  

                  Interesting. I was looking as the axes method, but I kept having problems with maintaining scaling.

                  Another thing: what if the component is skewed?

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

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                  • C Offline
                    cjthompson
                    last edited by

                    Do you want the transformation to have the same properties as the original(skew, scale, etc.) in the final result, or are you asking how to prevent skewing?

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                    • thomthomT Offline
                      thomthom
                      last edited by

                      No - I wondered if it preserved it.
                      I wanted to only move and rotate the object to a new plane. I wondered if this method would be an option as oppose to combining a translation and two rotation transformations.

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

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                      • C Offline
                        cjthompson
                        last edited by

                        @thomthom said:

                        No - I wondered if it preserved it.
                        I wanted to only move and rotate the object to a new plane. I wondered if this method would be an option as oppose to combining a translation and two rotation transformations.

                        Well, first you have to determine which axis gets priority (because the angles between the axes in the original transformation may not be the same as the angles between the axes the user picked) then measure the angles between the prioritized axis and the other two, and apply the angles to the user axes (including face normal).

                        I'm pretty sure that doesn't make sense but I can't think of how else to describe it.
                        If you have any specific questions, I might be able to help a bit more.

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