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    [Code] Print the transformation matrix

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    • D Offline
      dacastror
      last edited by dacastror

      Hi, I'm trying to print a transformation matrix, I tried the following:

      pointdd = Geom::Point3d.new 11,22,33 tdd = Geom::Transformation.new pointdd a = tdd.to_a text="-------------------------------------------------------\n" 4.times do |b| 4.times do |e| if ((e+1)%4==0) text << a[e*4+b].to_s+"\n" else text << a[e*4+b].to_s+" "+" "+" "+" "+" "+" "+" "+" "+" "+" " end end end text<<"------------------------------------------------------\n" UI.messagebox( text, MB_MULTILINE)

      I wanted to hear suggestions of more elegant ways to do this. (I wrote several times +" " for failure to escrbir several spaces followed here)

      thank you for your attention.

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      • danielbowringD Offline
        danielbowring
        last edited by

        Here's one in your format, although you should probably use one of the ones above (More info here)

        
        def inspect_transformation_adv(t, args={})
            format = "%.#{args[;places] || 3}f"
            ta = t.to_a.map() {|i|
                format%[i]
            }
            maxlength = ta.max() {|i, j| i.length <=> j.length }.length
            ta = ta.map() {|i|
                i.ljust(maxlength)
            }
            return (0...4).map() {|i|
                (0...4).map() {|j|
                    ta[j*4+i]
                }.join(args[;separator] || ', ')
            }.join("\n")
        end
        
        
        >>> point = Geom;;Point3d.new 11,22,33
        >>> tdd = Geom;;Transformation.new pointdd
        >>> puts inspect_transformation_adv(tdd)
        1.000 , 0.000 , 0.000 , 11.000
        0.000 , 1.000 , 0.000 , 22.000
        0.000 , 0.000 , 1.000 , 33.000
        0.000 , 0.000 , 0.000 , 1.000 
        >>> puts inspect_transformation_adv(t, {;separator => ' '})
        1.000  0.000  0.000  11.000
        0.000  1.000  0.000  22.000
        0.000  0.000  1.000  33.000
        0.000  0.000  0.000  1.000 
        
        
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        • danielbowringD Offline
          danielbowring
          last edited by

          
          def inspect_transformation(t)
              ta = t.to_a
              return (0...4).collect() {|i|
                  ta[i*4, 4].join(', ')
              }.join("\n")
          end
          
          
          
          >>> point = Geom;;Point3d.new 11,22,33
          >>> tdd = Geom;;Transformation.new pointdd
          >>> puts inspect_transformation(tdd)
          1.0, 0.0, 0.0, 0.0
          0.0, 1.0, 0.0, 0.0
          0.0, 0.0, 1.0, 0.0
          11.0, 22.0, 33.0, 1.0
          
          

          Edit: And if you like things to line up:

          
          def inspect_transformation_adv(t, args={})
              format = "%.#{args[;places] || 3}f"
              ta = t.to_a.map() {|i|
                  format%[i]
              }
              maxlength = ta.max() {|i, j| i.length <=> j.length }.length
              ta = ta.map() {|i|
                  i.ljust(maxlength)
              }
              return (0...4).collect() {|i|
                  ta[i*4, 4].join(args[;separator] || ', ')
              }.join("\n")
          end
          
          
          
          >>> point = Geom;;Point3d.new 11,22,33
          >>> tdd = Geom;;Transformation.new pointdd
          >>> puts inspect_transformation_adv(tdd)
          1.000 , 0.000 , 0.000 , 0.000 
          0.000 , 1.000 , 0.000 , 0.000 
          0.000 , 0.000 , 1.000 , 0.000 
          11.000, 22.000, 33.000, 1.000 
          
          

          Edit: although that's not the orientation you use

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          • thomthomT Offline
            thomthom
            last edited by

            Is it to visually inspect the matrix of entities, if so you can use this tool: http://forums.sketchucation.com/viewtopic.php?t=44859

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

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            • Dan RathbunD Offline
              Dan Rathbun
              last edited by

              Here's my simple brute force method:

                def trans_matrix_text( gt )
              
                  return "Not a trnasformation object!" unless gt.is_a?(Geom;;Transformation)
                  
                  a = gt.to_a
                  
                  w = 3  # width
                  a.each{|n| s = n.to_s.size; w = s if s>w }
                  l = (w*4)+3
                  
                  # create a line output format string;
                  fmt = "  | %#{w}s %#{w}s %#{w}s %#{w}s |\n"
                  
                  text = "\n"
                  
                  text << (32.chr*2)<<151.chr<<151.chr<<(32.chr*l)<<151.chr<<151.chr<<"\n"
                  text << fmt % [  a[0].to_s,  a[1].to_s,   a[2].to_s,  a[3].to_s ]
                  text << fmt % [  a[4].to_s,  a[5].to_s,   a[6].to_s,  a[7].to_s ]
                  text << fmt % [  a[8].to_s,  a[9].to_s,  a[10].to_s, a[11].to_s ]
                  text << fmt % [ a[12].to_s, a[13].to_s,  a[14].to_s, a[15].to_s ]
                  text << (32.chr*2)<<151.chr<<151.chr<<(32.chr*l)<<151.chr<<151.chr<<"\n"
                  
                  return text
              
                end # def
              
                pt = Geom;;Point3d.new( 11,22,33 )
                text = trans_matrix_text( Geom;;Transformation.new(pt) )
                
                UI.messagebox( text, MB_MULTILINE, "Tranformation Matrix" )
              
              

              I have tweaked my system by copying Consolas font to the font used by dialogs, so I have monospaced text output. (It was easier than tweaking the resources in the executable after each update.)

              trans_matrix_MB.png

              trans_matrix_IO.png

              💭

              I'm not here much anymore.

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              • D Offline
                dacastror
                last edited by

                Thanks for responding, I have helped a lot. 😄

                me a question arises about the transformations. if I need to apply a transformation to an object but not in the principal coordinate axes, but the coordinate axes of a group (rotated) what should I use?

                (sorry for my bad English)

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                • thomthomT Offline
                  thomthom
                  last edited by

                  You mean, transform an object around its own axis and not world axis?

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

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                  • D Offline
                    dacastror
                    last edited by

                    @thomthom said:

                    You mean, transform an object around its own axis and not world axis?

                    yes, exactly

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                    • thomthomT Offline
                      thomthom
                      last edited by

                      Create a local transformation and apply with with .transform!( tramsformation ) instead of setting the .transformation matrix manually. Or am I missing something?

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

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                      • D Offline
                        dacastror
                        last edited by

                        @thomthom said:

                        Create a local transformation and apply with with .transform!( tramsformation ) instead of setting the .transformation matrix manually. Or am I missing something?

                        How to create a local transformation? I would like to see some sample piece of code to guide me

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                        • D Offline
                          dacastror
                          last edited by

                          I wonder if there is any way to know the orientation of a group with respect to the axis of the world

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                          • TIGT Offline
                            TIG Moderator
                            last edited by

                            You have the model's axes from X_AXIS etc and ORIGIN.
                            Then you have group.transformation.axes or group.transformation.xaxis etc... and group.transformation.origin too...
                            So you can find the relative locations [which are points3ds] and angles between axes [which are vector3ds] - see the methods for those types...

                            TIG

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                            • thomthomT Offline
                              thomthom
                              last edited by

                              @dacastror said:

                              @thomthom said:

                              Create a local transformation and apply with with .transform!( tramsformation ) instead of setting the .transformation matrix manually. Or am I missing something?

                              How to create a local transformation? I would like to see some sample piece of code to guide me

                              <span class="syntaxdefault"><br />point </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> instance</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">transformation</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">origin<br />vector </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> instance</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">transformation</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">yaxis<br />rotation </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> Geom</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">Transformation</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">rotation</span><span class="syntaxkeyword">(</span><span class="syntaxdefault"> point</span><span class="syntaxkeyword">,</span><span class="syntaxdefault"> vector</span><span class="syntaxkeyword">,</span><span class="syntaxdefault"> 30</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">degrees </span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">instance</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">transform</span><span class="syntaxkeyword">!(</span><span class="syntaxdefault"> rotation </span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault"> </span>
                              

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

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                              • D Offline
                                dacastror
                                last edited by

                                thank you very much Thomas and Tig that prompt reply! 😄

                                I will try to implement your suggestions right now

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