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    This is just weird

    Scheduled Pinned Locked Moved SketchUp Bug Reporting
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    • GaieusG Offline
      Gaieus
      last edited by

      OK, I was going to upload the model but even on save, some weird things happen.

      Do this:

      1. Draw a block
      2. resize its bottom face in a direction by -1 (i.e. mirror it). It will somehow flip the whole thing around like this (although a face on each side will disappear!):

      Untitled.jpg

      1. now select all and intersect with model (to separate the faces that got crossed)
      2. now start double clicking on the top triangular face (like in the image above) the bottom lines will still be selected. Also, if you delete one of those lines, the top triangular face will also disappear.
      3. the lines can be individually selected, i.e. they are properly separated by the intersection.
      4. now comes the top of all: save the file and see what happens!
        😲

      Gai...

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      • D Offline
        Dik Harrison
        last edited by

        I'm being dense,
        @gaieus said:

        resize its bottom face in a direction by -1 (i.e. mirror it).

        Have fun...

        Dik

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        • R Offline
          remus
          last edited by

          Dik, select a face then get the scale tool and scale it by a factor of -1.

          Gai, im guessing SU still thinks it is all the same face because it was to start with, still pretty weird though.

          p.s. whats meant to happen when you save? i didnt notice anything.

          http://remusrendering.wordpress.com/

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          • D Offline
            Dik Harrison
            last edited by

            That is what I did, this is what I got...
            Weird.jpg

            Have fun...

            Dik

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            • R Offline
              remus
              last edited by

              The mystery deepens... πŸ˜„

              http://remusrendering.wordpress.com/

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              • Chris FullmerC Offline
                Chris Fullmer
                last edited by

                Hmm, I'm not getting that Gaieus. Mine comes out as I would expect. See my pic.

                Dik, what you're getting is a reported bug. You dragged the face to a certain distance, then typed in -1. And it actually scaled it to whatever you scaled it plus -1. So it really scaled itself to like -1.5 or something. That is why the bottom face did not do a true -1 scale.

                That is odd though that Dick and I are unable to reproduce it. Remus you'rs came out looking just like Gaieus's? Your on Vista, right? Me too. odd.

                But I do get the invalid geometry when checking or saving the model. So it is at least a stable way to produce invalid geometry.

                Chris


                scaled.jpg

                Lately you've been tan, suspicious for the winter.
                All my Plugins I've written

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                • GaieusG Offline
                  Gaieus
                  last edited by

                  OK,so what happens when I save it, that two faces get deleted.Just by saving the file. It is probably because it was set to fix problems - I'll try some other ways (yesterday I didn't really have time to fiddle around and elaborate the glitch).

                  Gai...

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                  • D Offline
                    Dik Harrison
                    last edited by

                    The last picture I posted was not created correctly, I drug the face beyond the far side before entering the -1. This time I just drug it in that direction and then entered -1. The second picture is what it change to when I saved the file. I'm running XP-pro.
                    Before saving.
                    After saving.

                    Have fun...

                    Dik

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                    • GaieusG Offline
                      Gaieus
                      last edited by

                      Yes, that's it.

                      (the fact that it "jumps" by a same amount as the size of the scaled thing is indeed a bug that Chris mentioned above - it cannot be seen in your model).

                      Gai...

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                      • D Offline
                        Dik Harrison
                        last edited by

                        I see, and the two triangular faces disappear when you save because the diagonal edges don't intersect with the two remaining vertical edges, thus there cannot be a face. Like I said earlier, I'm being dense...

                        Have fun...

                        Dik

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                        • Chris FullmerC Offline
                          Chris Fullmer
                          last edited by

                          Gaieus, do you have SU set to automatically check AND fix models on saving? Maybe thats why it delets stuff on saving. Sometimes fixing a model will delete a few bad faces, so maybe it is checking and fixing it without tell u.

                          Chris

                          Lately you've been tan, suspicious for the winter.
                          All my Plugins I've written

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                          • GaieusG Offline
                            Gaieus
                            last edited by

                            @dik harrison said:

                            I see, and the two triangular faces disappear when you save because the diagonal edges don't intersect with the two remaining vertical edges, thus there cannot be a face. Like I said earlier, I'm being dense...

                            They wouldn't intersect by themselves but I selected all and went to > intersect with model. I can even select all the lines separately but when I delete one of the bottom lines, the top triangle is deleted as well although its bounding edges remain.

                            @chris fullmer said:

                            Gaieus, do you have SU set to automatically check AND fix models on saving? Maybe thats why it delets stuff on saving. Sometimes fixing a model will delete a few bad faces, so maybe it is checking and fixing it without tell u.

                            Chris

                            I also thought of that so I unchecked it but still it deletes on save.


                            In general, it does not really bug me since I'd probably not get into a situation to do things like this - it's rather just a bit of fun and bug hunting. πŸ˜„

                            Gai...

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                            • thomthomT Offline
                              thomthom
                              last edited by

                              Another page for the book of SketchUp quirks...

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

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                              • G Offline
                                guzman tierno
                                last edited by

                                You can reproduce the bug even in 2D:

                                draw a rectangle,
                                move a point of the rectangle so that two edges cross,
                                you'll get a triangular face and an emtpy triangle:

                                Image8.jpg

                                now select all and intersect,

                                if you delete any side of the empty triangle
                                the triangular face that has apparently nothing to do
                                gets deleted too.

                                I think that SU still considers all those edges
                                as bounding edges of the face.
                                SU still considers all the edges as a single polygon
                                that just happens to have a point that gets used twice.
                                Try for instance to place the point you moved to its initial position
                                and then select the face: you'll notice that there is just one face:

                                Image10.jpg

                                hope this helps somehow.

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