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    [Plugin] Import OBJ with Materials v2.1 20131118

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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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                                        • TIGT Offline
                                          TIG Moderator
                                          last edited by

                                          I see the messed up UV textures.
                                          I re-imported it as 'mm' and the messed geometry went.
                                          BUT I had to edit the faulty UV mapped parts manually.
                                          As it's symmetrical a quick mirror/copy of the correct panel on the other side fixed them.
                                          The 'Badge' is messed up though - did you map that on separately ?
                                          I've no idea why just those few parts fail to map properly ๐Ÿ˜•
                                          VAN.PNGVAN.skp

                                          TIG

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                                          • thomthomT Offline
                                            thomthom
                                            last edited by

                                            I import in mm - but it's not just the UV being messed up. It's the actual geometry.
                                            Notice that for the incorrect mapping the face is split diagonally-crossing itself - as opposed to the mirrored side.
                                            When you compare against the 3ds import you see that Max does not do this.

                                            I did not do anything to the mapping other than take the OBS into PS and adding the text on the side of the van. The model came from a pre-modelled and pre-mapped third party model.

                                            I wonder if it's the order of the vertices that's abnormal in these cases... ?

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

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