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Camera space question

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  • J Offline
    Jim
    last edited by 8 Feb 2008, 22:05

    I think you may be looking too deeply. How would you do it in model space?

    Hi

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    • P Offline
      Pixero
      last edited by 8 Feb 2008, 22:13

      In "world space" I do it:

      newPos = Geom::Point3d.new(pos.x+Xdist, pos.y+Ydist, pos.z+Zdist)
      pos = newPos

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      • J Offline
        Jim
        last edited by 8 Feb 2008, 22:34

        This might work...

        
        xdist = 10
        pos = Geom;;Point3d.new(0,0,0)
        camera_axis = Sketchup.active_model.active_view.camera.xaxis
        camera_axis.length = xdist
        newPos = pos + camera_axis
        
        

        Hi

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        • A Offline
          AdamB
          last edited by 8 Feb 2008, 22:56

          Ah, ok. So you need to transform your x-length,y-length,z-length into world space.

          camera_space_translation = Geom::Vector3d.new(xDist,yDist,zDist)

          then

          world_space_translation = Geom::Vector3d.new(view.camera.xaxis.dot(camera_space_translation),
          view.camera.yaxis.dot(camera_space_translation),
          view.camera.zaxis.dot(camera_space_translation))

          (do whatever with world_space_translation)

          BTW This is just a long hand vector-matrix multiply.

          Developer of LightUp Click for website

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          • J Offline
            Jim
            last edited by 8 Feb 2008, 23:35

            Adam,

            Is your method different than using the Transformarion.axis, which is a

            @unknownuser said:

            method is used to create a Transformation that goes from world coordinates to an arbitrary coordinate system

            Is the result the same? I could use a course on 3d mathematics, particularly as it applies in SketchUp.

            Hi

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            • A Offline
              AdamB
              last edited by 9 Feb 2008, 00:02

              No different. Just wasn't sure whether you can get the camera matrix as a whole, so thought it just as easy to do 3 dot products. (And we do just want a 3x3 tranform here).

              Developer of LightUp Click for website

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              • P Offline
                Pixero
                last edited by 11 Feb 2008, 22:13

                Added Sketchup file to further explain above problem.


                Camspace_weirdness.skp

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                • P Offline
                  Pixero
                  last edited by 11 Feb 2008, 22:14

                  First, sorry for not getting back earlier. Its been kind of hectic here.

                  Thanks for answering but I still have problems.
                  Adam, your way gives relly weird results. Either there is something wrong with your method or (more possibly) there is something wrong with me. πŸ˜‰
                  When using your method and just translating the xDist it gets a transform also in th z axis and if I use the value 100 as xDist it gets moved a distance of 2540 mm?

                  Part of the code:

                  
                  camSpaceTranslation = Geom;;Vector3d.new(xDist, yDist, zDist)
                  worldSpaceTranslation = Geom;;Vector3d.new(camera.xaxis.dot(camSpaceTranslation), camera.yaxis.dot(camSpaceTranslation), camera.zaxis.dot(camSpaceTranslation))
                  
                  newEye = eye + worldSpaceTranslation
                  newTarget = target + worldSpaceTranslation
                  eye = newEye
                  target = newTarget
                  camera = camera.set(eye, target, up)
                  
                  

                  Once more to clearify what I'm after:
                  Moving along world axes is working but I want to numerically move the camera eye point and target point (the target shall just move the same amount as the eye) in the cameras sightline*(in/out),*left/right and up/down.
                  Any thoughts?

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                  • A Offline
                    AdamB
                    last edited by 12 Feb 2008, 09:41

                    And how many millimeters in an inch (the native units of Sketchup) are there?

                    @pixero said:

                    First, sorry for not getting back earlier. Its been kind of hectic here.

                    When using your method and just translating the xDist it gets a transform also in th z axis and if I use the value 100 as xDist it gets moved a distance of 2540 mm?

                    Developer of LightUp Click for website

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                    • J Offline
                      juju
                      last edited by 12 Feb 2008, 10:21

                      25.4mm to an inch.

                      Save the Earth, it's the only planet with chocolate.

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                      • G Offline
                        Gaieus
                        last edited by 12 Feb 2008, 12:08

                        @adamb said:

                        And how many millimeters in an inch (the native units of Sketchup) are there?

                        πŸ˜„
                        The "native" unit of mySketchUp is centimetre.

                        Gai...

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                        • J Offline
                          Jim
                          last edited by 12 Feb 2008, 23:37

                          ?

                          
                          model = Sketchup.active_model
                          c = model.active_view.camera
                          eye = c.eye
                          up = c.up
                          target = c.target
                          xaxis = c.xaxis
                          yaxis = c.yaxis
                          zaxis = c.zaxis
                          
                          model.entities.add_cpoint eye
                          model.entities.add_cpoint target
                          
                          model.entities.add_text("eye", eye)
                          model.entities.add_text("target", target)
                          
                          distance = 12
                          newEye = eye.offset(xaxis, distance)
                          model.entities.add_cpoint newEye
                          model.entities.add_text("newEye", newEye)
                          
                          newTarget = target.offset(xaxis, distance)
                          model.entities.add_cpoint newTarget
                          model.entities.add_text("newTarget", newTarget)
                          
                          c.set(newEye, newTarget, up)
                          
                          

                          Hi

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                          • R Offline
                            RickW
                            last edited by 13 Feb 2008, 22:10

                            Might I suggest AddPages as a reference script? It adds pages (scenes) orthographically (based on user-supplied x, y, and z offsets). If I understand the gist of the discussion, then AddPages has at its heart the transformation code in question.

                            RickW
                            [www.smustard.com](http://www.smustard.com)

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                            • P Offline
                              Pixero
                              last edited by 15 Feb 2008, 07:22

                              Thanks all for helping! 😍

                              Now I got it working the way I want.
                              I'll be back when the script is done.

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                              • P Offline
                                Pixero
                                last edited by 15 Feb 2008, 19:25

                                See this thread: http://www.sketchucation.com/forums/scf/viewtopic.php?f=153&t=1528&p=41330#p41330

                                And once more, thanks for helping!

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