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

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    • TIGT Offline
      TIG Moderator
      last edited by

      It makes a new transformation, within its origin at pt and new x and y axis vectors.
      When it is applied to an entity it should change the entity's origin and x & y axes ?

      TIG

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      • thomthomT Offline
        thomthom
        last edited by

        I tried by creating a transformation using that method - and then use that transformation object as such

        instance.transform!( t )
        Is it not suppose to be used like that? I thought it's do a move and rotate operation - offset from the current transformation. But I'm not getting a predictable result...

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

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        • Chris FullmerC Offline
          Chris Fullmer
          last edited by

          it mgiht need to be .transformation = t. try that and I wonder if it will get more predictable results. Perhaps not the right ones, but maybe more predictable.

          Lately you've been tan, suspicious for the winter.
          All my Plugins I've written

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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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