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20:37 – thread discussing average island scale issues, packing, pinning, margins and UV Packer

Forum Archive › 20:37 – thread discussing average island scale issues, packing, pinning, margins and UV Packer

Viewing 15 posts - 1 through 15 (of 18 total)
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  • December 8, 2023 at 7:35 pm #17182
    Charles
    Participant

      Any clue as to why my result looks so off from JL’s?

      Top: Before av island scale.
      Bottom: After av island scale.AV ISLANDS SCALE.png

      December 8, 2023 at 7:41 pm #82646
      Charles
      Participant

        Zooming in there are some suspicious areas highlighted. Might this be causing the issue?
        AV ISLANDS SCALE.png

        December 9, 2023 at 1:21 am #82647
        Martin Bergwerf
        Participant

          HI @thehomme ,

          Could that be caused by the Addon you’re using (UV Squares)?

          December 9, 2023 at 5:04 am #82648
          Charles
          Participant

            No. That’s worked fine. With live unwrap off I moved those errant vertices off the map then turned it back on to select and hide everything ‘ok’. This enabled me to see what objects those vertices were connected to. The really long ones were the cylinder end caps from my cables I’d not unwrapped. 

            AV ISLANDS SCALE.png

            Nothing seemed too important so I deleted them and then selected all and did an fresh average island scale. That gave me this but highlighted more issues… looks to be caused by the knee wire, the bundle of exposed controller wires and the inner thumb.

            AV ISLANDS SCALE.png

            I saved clean version of this model before I started this so I can mess around to try and diagnose the problem(s). Any clues from this info as to steps I should take? I’m sure all my curves are converted to meshes but I’ll double check. I didn’t explicitly unwrap some of the cables and wires as I thought I would just use separate plastic materials for them.

            December 9, 2023 at 5:45 am #82649
            Martin Bergwerf
            Participant

              If you didn’t Unwrap some of the Cables, you shouldn’t try to include them in the UV Map. (Curves without end caps should be fine, they already have a UV Map…unless you Unwrapped them agayxxx
              in, without making Seams)

              December 9, 2023 at 5:48 am #82650
              Martin Bergwerf
              Participant

                Also make sure that all the Scales are Applied.

                December 9, 2023 at 6:51 am #82651
                Charles
                Participant

                  OK I’ve messed around, found a few not quite scaled objects (the bolt and nut from the add-on you suggested!), deleted vertices that seemed odd in the UV map from the model without it seeming to cause an issue. I’ve no idea what’s going on but have ended up with this which seems about right. Although the overall scale seems wrong as it doesn’t scale to fill the boundaries of the map. I guess I’d have to unwrap again and then average again to get that?

                  AV ISLANDS SCALE.png

                  December 9, 2023 at 7:22 am #82652
                  Martin Bergwerf
                  Participant

                    You should now be able to simply Pack Islands after the Average Island Scale gave you the above result. No need to Unwrap again.

                    December 9, 2023 at 7:59 am #82653
                    Omar Domenech
                    Participant

                      Also try taking things one at a time when there’s issues like this one. Instead of having all the islands selected in a huge island mess, try first working with just the head, if all goes well then one arm, then the other, then the body, etc. That way it’s easier to discern where the problem is. Perhaps that’s what you ended up doing that gave you a working result. 

                      December 9, 2023 at 11:50 am #82654
                      Charles
                      Participant

                        Yes basically a process of elimination and fixing and deleting stuff that seemed to be causing problems. And I’d forgotten about the Pack Islands step! 

                        Now looking ok I think. I would be nice to be able to scale down the bottom of the feet islands to give more room for the body and switch. If I simply scale them down and then do another pack islands would that work or would they get scaled back up? How best to selectively scale down some elements so others can scale back up and knowing it’s not messing things up?

                        LANDS POST SCALE.png

                        December 9, 2023 at 1:28 pm #82655
                        Martin Bergwerf
                        Participant

                          Well, you can Scale up or down some Islands and then ‘Pin’ them (shortcut P).

                          Then, when you Pack Islands, you can Lock the Pinned Islands (there are some Options as well):

                          :Pin.png

                          I don’t have any experience with that, but I encourage you to play around..You should be able to get what you want, I think.

                          December 9, 2023 at 3:44 pm #82656
                          Charles
                          Participant

                            Thanks. I’ll do that. Something I think I need to adjust is the increase the margin for a 4k texture. 

                            December 9, 2023 at 4:47 pm #82657
                            Charles
                            Participant

                              OK – that worked. I couldn’t work out the margin scale though. JL gives a padding in pixels, but the Blender Pack margin value is not measured in pixels – what is it measured in? I’ve guessed (wildly!) and moved to .005 from previous .001. I dunno if I’ve been too generous. Maybe .001 was fine?

                              15 revised pack.png

                              For anyone reading, this is from the Texturing foundations course

                              solution padding.png

                              December 9, 2023 at 9:45 pm #82658
                              Omar Domenech
                              Participant

                                It used to be measured in pixels, I wonder when they changed that. I guess you could zoom in and try it by trial and error. Go with 00.1 and count by how many pixels it separates them. Kinda of a caveman approach but if it works no shame in brute forcing it. 

                                December 10, 2023 at 2:20 am #82659
                                Martin Bergwerf
                                Participant

                                  If you set the Margin to for instance .008 (1/128), it will always be the ‘same’, (1024 x 1024 would give 8 Pixels around each Island (what I think is meant by padding) and thus 16 Pixels between two adjacent islands, at least when using the Add method) no matter what resolution the Image is.

                                  That is probably (one of) the reason(s) they changed it from Pixels.

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