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[Plugin] OBJexporter v3.0 20130131

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  • K Offline
    Kralizek
    last edited by 10 Apr 2011, 18:38

    Works great for for me, thanks a lot TIG!

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    • I Offline
      Immer
      last edited by 16 Apr 2011, 00:08

      Thanks TIG, this is an incredibly useful plugin, the most reliable obj-exporter I've tried.

      I have one feature request though - could you add an option to export faces with distorted textures using the original texture and just save the "distorted" UV coordinates in the .obj file? As it is now doing something as simple as exporting a spherically-mapped globe can generate hundreds of distorted texture files and a correspondingly complicated .obj file, not exactly ideal for loading into another program.

      I've modified version 1.1 to normalize the UVQ coordinates before export and it seems to work fine, it would be nice to have access to the more recent features though so I'm sending you the change in hopes that you'll incorporate it into the next version

      the relevant change was changing the line
      f_uvs=(1..mesh.count_points).map{|i|mesh.uv_at(i,1)}####1=front
      to
      f_uvs=(1..mesh.count_points).map{|i|flattenUVQ(mesh.uv_at(i,1))}####1=front
      where flattenUVQ is defined as
      def flattenUVQ(uvq)
      return Geom::Point3d.new((uvq.x/uvq.z), (uvq.y/uvq.z), 1.0)
      end

      Thanks a bunch!

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      • T Offline
        TIG Moderator
        last edited by 16 Apr 2011, 16:06

        Sketchup's own OBJexporter also makes individual 'distorted' images when a texture has been 'distorted' by UV mapping - simple rotations or scaling shouldn't produce multiple images.
        I added the feature to mimic it because otherwise you don't get the correct 'distortion' - I have previously tried the very method you outline in your code snippet but it never gave satisfactory results. The flattenUVQ method is actually in the code 'unused' [until the more recent updates that make distorted images...].
        A distorted texture has 4 uvs but a triangulated mesh makes just 3 per facet ??

        TIG

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        • I Offline
          Immer
          last edited by 16 Apr 2011, 21:52

          Yeah, I had noticed and used the flattenUVQ method provided - I figured it was something you had brought in from someone else's code but didn't use. I didn't see it in the latest version so I thought I'd include it in case you didn't have an archive of older versions.

          Don't get me wrong, it's awesome that you've managed to export non-linearly distorted faces accurately, however for many situations a linear approximation is preferable, especially if lots of additional textures or a complicated group layout present problems - like if you intend to use the exported object in a game engine, or want to fine-tune the UV mapping in another program. It may even be what was actually intended: for example UVTools' spherical map apparently uses distorted textures when linear interpolation is the correct method. In fact I'm not sure it's even possible to specify a lineraly distorted face in Sketchup. I've yet to find a way to, for example, squeeze a rectangular texture onto a trapezoid so the edges and center-points line up perfectly, and that's UV mapping 101.

          All I'm suggesting is a checkbox on the option screen to choose between the accurate method and the "clean" one, it should just be a matter of changing the logic to

          
          if "face is distorted"     *AND* "use accurate method"
             create accurate texture
             export face using accurate texture
          else
             output face with normalized UVs # normalizing should have no effect on non-distorted faces
          
          
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          • A Offline
            Alienizer
            last edited by 17 Apr 2011, 01:48

            *** BUG REPORT ***

            Using this model from the 3D warehouse...

            Error 404 (Not Found)!!1

            favicon

            (sketchup.google.com)

            it export just fine, except the last line in the mtl file is "newmtl fueg" and nothing else after. The file is lock for writing, and after closing Sketchup, the reminder is written to the mtl file.

            I'm from Mars and moved to Earth to alienize you. Unfortunately, I became humanized.

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            • T Offline
              TIG Moderator
              last edited by 17 Apr 2011, 12:43

              It is a 9Mb SKP and makes an OBJ file with 41 million lines of code so taking 5min+ to complete isn't surprising!
              It worked fine for me...
              The only 'error' was it didn't write '#EOF' into the end of the MTL file but that's just for me so I know it's done all materials [but it had?]

              TIG

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              • A Offline
                Alienizer
                last edited by 17 Apr 2011, 15:42

                @tig said:

                It is a 9Mb SKP and makes an OBJ file with 41 million lines of code so taking 5min+ to complete isn't surprising!
                It worked fine for me...
                The only 'error' was it di dn't write '#EOF' into the end of the MTL file but that's just for me so I know it's done all materials [but it had?]

                I let mine site all night for 9 hours and the last line of the mtl file still was "newmtl fueg", and the exporter stutus said it was done in 66 secs. So I closed Sketchup and that commited the buffer to the mtl file and it was then complete!

                I'm from Mars and moved to Earth to alienize you. Unfortunately, I became humanized.

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                • T Offline
                  TIG Moderator
                  last edited by 17 Apr 2011, 16:16

                  Strange - might be a memory issue ?
                  Also the missing [but not fatal] '#EOF' in the MTL was puzzling as there were no error messages ???
                  If I get to the bottom of it I'll let you know.

                  TIG

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                  • A Offline
                    Alienizer
                    last edited by 17 Apr 2011, 16:46

                    @tig said:

                    Strange - might be a memory issue ?
                    Also the missing [but not fatal] '#EOF' in the MTL was puzzling as there were no error messages ???
                    If I get to the bottom of it I'll let you know.

                    This is the second model it did this. The first one, I thought it was Sketchup because when I closed it, then file became complete. I don't remember which one it was! I know the file doesn't get closed because it has a write lock on it until you close Sketchup, even though the exporter is done without any errors!

                    I have a suggestion 😳 Can you incorporate the fix reverse back face material in the exporter? Perhaps add a checkbox for that opton? Maybe it's faster to do it as it goes then using both plugins? I'm not the expert so I don't know.

                    Thanks TIG, your exporter is by far the best the way it is.

                    I'm from Mars and moved to Earth to alienize you. Unfortunately, I became humanized.

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                    • A Offline
                      Alienizer
                      last edited by 20 May 2011, 19:05

                      TIG, does your exporter use the object axis to orient the triangle? The reason I ask is, if I change the axis from blue up to blue down in a group, the triangle face is reversed when exported, and the ray/triangle test shows that it hit the backface when in fact it did not! Same happen with the SK obj exporter. Any idea? thanks.

                      I'm from Mars and moved to Earth to alienize you. Unfortunately, I became humanized.

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                      • X Offline
                        xlntgraphix
                        last edited by 25 May 2011, 00:06

                        Thanks TIG! I'm new at this (less than a week) but this is exactly what I'll need for my 1st project. I still haven't really grasped the why to choose "group -vs- component" strategies. Now, in an above reply, it seems you were adding a "when to or whether to" aspect, where exporting is concerned. Have I mis-understood you? Could you please clarify? Again THANKS for this awesome plug-in. -XLNTgraphix

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                        • T Offline
                          tichit
                          last edited by 29 May 2011, 13:09

                          Thank you so much, this plugin is very useful for me.

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                          • A Offline
                            Alienizer
                            last edited by 19 Jun 2011, 00:24

                            One more model that the texture does not export properly but it does with the skp obj exporter...

                            Error 404 (Not Found)!!1

                            favicon

                            (sketchup.google.com)

                            Beside that, you rock, so as your exporter, thank you.

                            I'm from Mars and moved to Earth to alienize you. Unfortunately, I became humanized.

                            1 Reply Last reply Reply Quote 0
                            • R Offline
                              remon_v
                              last edited by 29 Jun 2011, 08:44

                              Great work on the OBJ exporter πŸ˜„
                              So if I understand correctly it is not possible to export quad polygons atm?

                              Cheers
                              remon_v

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                              • T Offline
                                TIG Moderator
                                last edited by 29 Jun 2011, 09:46

                                @remon_v said:

                                Great work on the OBJ exporter πŸ˜„
                                So if I understand correctly it is not possible to export quad polygons atm?

                                Cheers
                                remon_v
                                No, all faces are 'triangulated' - which is a requirement for many renderers anyway...

                                TIG

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                                • R Offline
                                  remon_v
                                  last edited by 29 Jun 2011, 09:51

                                  Yes true, for Octane it is. Why I'm asking is because I want to intrigate SU in my Workflow for architectural modeling. So I want to model the basics in SU and export to Modo, add the organic stuff and render. I just tried accutrans to detriangulate, but it doesn't work for a 100%.

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                                  • T Offline
                                    TIG Moderator
                                    last edited by 29 Jun 2011, 10:33

                                    Of course the built-in OBJ-exporter in Sketchup Pro lets you specify triangulation or NOT...Capture.PNG
                                    Why not get the time limited version and use it for just that [you can run versions in parallel] - the improvements in v8 makes it worth upgrading anyway...
                                    My tool is intended for those 'Free' users who want some OBJ-export capability - but limiting it to triangulation and meters is the price you [don't] pay πŸ˜‰ ...

                                    TIG

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                                    • R Offline
                                      redlerred7
                                      last edited by 28 Aug 2011, 13:32

                                      I normally export as .X with a similar plugin. I ask: will this make 2k texture image files if you're whole 20k face model is UV Mapped almost completely with projected textures?

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                                      • T Offline
                                        TIG Moderator
                                        last edited by 28 Aug 2011, 14:00

                                        If the textures are simply positioned or rotated/scaled one image-file is used for all versions and adjusted within the OBJ code itself, but with distorted/skewed textures passing the 4 required vertex-normals to a 3-vertexed triangle-face is awkward [impossible?] - this tool and the Pro OBJ-exporter make separate image-files for each face with such a distorted textured material. The Pro version does 'reuse' some image-files that have the exact same distortion, but my exporter does not [it makes one image-file for every distorted texture]... SO if you have a complex set of faces with skewed textures you will get a lot of image-files exported... πŸ˜•

                                        TIG

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                                        • P Offline
                                          pcfreak1997
                                          last edited by 2 Oct 2011, 19:56

                                          Love it! This is the best I've seen yet!

                                          1 Reply Last reply Reply Quote 0
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