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    [Plugin] Import OBJ with Materials v2.1 20131118

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    • J Offline
      jchau2007
      last edited by

      Tig I just wanted you to know that your constribution will never be forgotten as well as many other great plugin writers. Some times people just took these great plugins for granted. When something doesn't for an individual, they complained. Some of us don't know how fortunate we are to have all these great individuals to write up the plugins and given them for free. Wait til the plugin writer start charging people to have their plugins download... then people will go nutz.

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      • TIGT Offline
        TIG Moderator
        last edited by

        Thanks for the kind words... I know it's not perfect but it does work a lot of the time and there are work around for when the obj's format is incompatible...
        I just got rankled at the lack of civility or useful criticism in that recent post - "if you can do better do it", was my challenge...
        ๐Ÿ˜’

        TIG

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        • TIGT Offline
          TIG Moderator
          last edited by

          Here's v1.5 20100816 Missing 'group' in some types of OBJ code trapped [with "g OBJ"].
          http://forums.sketchucation.com/viewtopic.php?p=172790#p172790

          TIG

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          • X Offline
            xrok1
            last edited by

            ๐Ÿ˜‰

            โ€œThere are three classes of people: those who see. Those who see when they are shown. Those who do not see.โ€

            http://www.Twilightrender.com try it!

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            • thomthomT Offline
              thomthom
              last edited by

              I tried out this importer on a obj I had exported from SU - then edited in PS.
              On importing it back to SU I noticed some errors. Attached is the model and screenshots from SU vs Max:

              SketchUp 3Ds Max

              SketchUp 3Ds Max

              p.s.: the topic title doesn't reflect the current version. ๐Ÿ˜‰


              Think I zipped all the files...

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

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              • thomthomT Offline
                thomthom
                last edited by

                Just noticed another glitch above the left front light.

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

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                • J Offline
                  jsteacy
                  last edited by

                  TIG, I tried using your script to import .obj files from this website http://www.modelplusmodel.com, and it doesn't work. note that it didn't work for the simlab importer as well, something about negative indexes of the faces. Can you look into it? Also reading through the posts trying to get a better understanding of the .obj file type. Does every obj file need a mtl file for materials and textures?

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                  • TIGT Offline
                    TIG Moderator
                    last edited by

                    @jsteacy said:

                    TIG, I tried using your script to import .OBJ files from this website http://www.modelplusmodel.com, and it doesn't work. Note that it didn't work for the Simlab Importer as well, something about negative indexes of the faces. Can you look into it? Also reading through the posts trying to get a better understanding of the .OBJ file type. Does every OBJ file need an MTL file for materials and textures?

                    That site's free-sample bird 3DS file imported OK [in Pro] - see below...
                    BUT the OBJ file format... ๐Ÿ˜’
                    To answer your questions first...
                    If there is no MTL file then there are no colors/materials in the resulting mesh.
                    If there is an MTL file but no images in the defined ../folder_path/file_name then there objects with materials specified will only get the color without the texture.

                    The f 123/123 124/124 125/125 is the correct way for a face to be specified in an OBJ file - this face is triangular, and uses vertices 123/124/125 [v] and the equivalent texture vertices [vt].
                    I can't see why their OBJ file format uses negative values at all !!! ๐Ÿ˜•

                    My OBJ Importer is not foolproof... BUT can you point me at exact problem [OBJ[MTL] files... or PM me them ?
                    I can change my code to trap for any negative values for 'face indices' [see below]... BUT the imported object might end up being rubbish anyway ? I suspect that we need a miracle ?? ๐Ÿ˜ฎ Capture.PNG

                    TIG

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                    • J Offline
                      Jim
                      last edited by

                      negative vertex references are legal in the .obj format.

                      f -1 -2 -3

                      this just means use the vertexes defined 1, 2, and 3 lines previous. Negative index values mean a relative offset from the current line. (I think. ๐Ÿ˜’ ) Not sure if it includes all lines, or just 'v' lines in the count, though.

                      Hi

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                      • N Offline
                        notareal
                        last edited by

                        "BUT the imported object might end up being rubbish anyway ? I suspect that we need a miracle ??"
                        I believe it can be done... well just tested and Thea did import that 'F06 House bird' OK... sorry I don't have internal details how importer will actually handle this model.

                        Welcome to try [Thea Render](http://www.thearender.com/), Thea support | [kerkythea.net](http://www.kerkythea.net/) -team member

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                        • J Offline
                          Jim
                          last edited by

                          Since Ruby has negative array indexes already, and the .obj is imported in at least a recognizable format, it may be something simple like an off-by-one error for negative indexes.

                          Hi

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                          • J Offline
                            jsteacy
                            last edited by

                            I tried all of them including the house bird, and nothing gets imported. This is what I get from the console after I click the units to import to:

                            Error; #<ArgumentError; Cannot convert argument to Sketchup;;Point3d>
                            C;/Program Files/Google/Google SketchUp 7/Plugins/obj_importer.rb;278;in `add'
                            C;/Program Files/Google/Google SketchUp 7/Plugins/obj_importer.rb;278;in `run'
                            C;/Program Files/Google/Google SketchUp 7/Plugins/obj_importer.rb;278;in `map'
                            C;/Program Files/Google/Google SketchUp 7/Plugins/obj_importer.rb;278;in `run'
                            C;/Program Files/Google/Google SketchUp 7/Plugins/obj_importer.rb;208;in `each'
                            C;/Program Files/Google/Google SketchUp 7/Plugins/obj_importer.rb;208;in `run'
                            C;/Program Files/Google/Google SketchUp 7/Plugins/obj_importer.rb;329
                            C;/Program Files/Google/Google SketchUp 7/Plugins/obj_importer.rb;329;in `call'
                            

                            hope that helps

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                            • TIGT Offline
                              TIG Moderator
                              last edited by

                              So if the face-indices are 'negative' then we work backwards through the face vertex lists ? - i.e we reverse the array of v's, and take the abs value as the index ? ๐Ÿ˜•

                              TIG

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                              • J Offline
                                Jim
                                last edited by

                                Line 248:

                                
                                values.each do |v|
                                w = v.split("/")
                                vvv = Integer(w[0])
                                if vvv <= -2 # this 
                                  vvv += 1
                                end
                                face<<Integer(vvv)
                                face_uvs.push(w[1].to_i)if w[1]
                                
                                

                                And maybe look at fill_from_mesh instead of a dd_faces_from_mesh. # Line 302. Probably left over from someone else..

                                587.png

                                I'm shocked it actually seems to have worked - it was just a hunch.

                                Hi

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                                • TIGT Offline
                                  TIG Moderator
                                  last edited by

                                  Here's a slightly different version that I was working on independently - it also works !
                                  http://forums.sketchucation.com/viewtopic.php?p=172790#p172790 [v1.7 has fill from mesh changes too]Capture.PNG

                                  TIG

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                                  • thomthomT Offline
                                    thomthom
                                    last edited by

                                    Any ideas what caused these glitches? http://forums.sketchucation.com/viewtopic.php?f=323&t=20584&start=75#p264875

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

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                                    • TIGT Offline
                                      TIG Moderator
                                      last edited by

                                      Thomthom, I assume you are referring to the size/units ?
                                      If the file has a '# units = meters' line then the importer defaults to 'meters' [or whatever it says].
                                      If it doesn't then it defaults to 'inches'.
                                      However, as it starts a dialog lets you choose whatever units you'd like to use anyway [preset to those default units].
                                      Some meshes don't form the tiny faces if the units are set too small - e.g. if you were to choose 'mm' when it was made in 'meters'. So if you are unclear about the units and none are specified then you can try out alternatives until you get a proper mesh without holes...
                                      The reason the tool has three options is speed - 'as mesh' is fast but can fail when the OBJ code is convoluted; otherwise the textures can be added or not as desired.
                                      The old sizing issue seems resolved.
                                      PS: I can't tested your problem 'van' OBJ/MTL because PPartner010000.jpg wasn't in the zip file?
                                      But I can see that its geometry seems a bit messed up around the side windows and the image file-names have spaces in them which confuses the MTL parser. I thought that you were 'recommended' to avoid having spaces in these paths/names - however, manually editing the MTL and the corresponding image-names so they are without spaces fixes that... BUT the 'PPartner010000.jpg' file is still missing altogether - see the Ruby Console error reporting ๐Ÿ˜•

                                      TIG

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                                      • TIGT Offline
                                        TIG Moderator
                                        last edited by

                                        Busy today! Heres 1.8 - Trapped for spaces in image-names/paths.
                                        http://forums.sketchucation.com/viewtopic.php?p=172790#p172790

                                        TIG

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                                        • thomthomT Offline
                                          thomthom
                                          last edited by

                                          @tig said:

                                          Thomthom, I assume you are referring to the size/units ?

                                          No - it was the messed up geometry you noticed. You see it in the screenshots I posted - with the red circles.

                                          @tig said:

                                          PS: I can't tested your problem 'van' OBJ/MTL because PPartner010000.jpg wasn't in the zip file?
                                          But I can see that its geometry seems a bit messed up around the side windows and the image file-names have spaces in them which confuses the MTL parser. I thought that you were 'recommended' to avoid having spaces in these paths/names - however, manually editing the MTL and the corresponding image-names so they are without spaces fixes that... BUT the 'PPartner010000.jpg' file is still missing altogether - see the Ruby Console error reporting ๐Ÿ˜•

                                          The OBJ was initially created by SketchUp - then edited textures in PhotoShop.

                                          I've attached the missing texture.

                                          Will try v 1.8


                                          missing texture

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

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                                          • thomthomT Offline
                                            thomthom
                                            last edited by

                                            Even with 1.8 some geometry is messed up. Seem to be the same faces.

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

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