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    SubD examples and models

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    • O Offline
      optimaforever
      last edited by

      Nice schemetic views indeed!
      Thanks for sharing.
      Just like substances, I tend to see quads in everything now. Just a mental exercise.

      Now, I wanted to ask, is it a recommended thing to regenerate quads on quads?
      I mean, let's say I model a raw mesh in several clicks, then apply a subD on it, then explode it, then remove some redundant loops generated by subD, add some new vertices here and there, subD again, explode again, remove some redundant loops here and there, tweak some crease values, subD again, explode again, remove some loops, etc. etc.
      The objective is to be able to get rid of some redundant loops that only add useless polys and keep adding details only where that matters.
      I'm pretty conservative in my workflow so I don't know if this is a common method as nobody seems to talk about this?

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      • HornOxxH Offline
        HornOxx
        last edited by

        Hi & Thanks!
        hmm - probably I do not understand (translate) correctly 😉 wouldn´t it be the SubD process itself, which makes out of a simple raw proxy geometry a new geometry with too much loops then? - you'd also need a good computer, to SubD this new very large proxy then again ...

        never trust a skinny cook

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        • O Offline
          optimaforever
          last edited by

          Often subdivision creates redundant loops which are useless (basically in flat areas), and some geometry refinement where it matters (in round, convex/concave areas).
          So I'm asking if I can get rid of these "useless" loops, and build upon previous subdivisions, explode and keep subdividing while simplifying the control mesh by removing redundant loops each time.
          SubD is limited to 4 subdivisions I think, so this could allow for more detailed meshes.

          I haven't tried this "method" though, but was wondering if there was any problem with this approach of modelling.

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          • Z Offline
            ZahariStoyanov
            last edited by

            @optimaforever said:

            was wondering if there was any problem with this approach of modelling.

            I'd say it's all up to your preferences. The excess loops you're talking about can be annoying and resource consuming indeed. Since you can't prevent them from appearing, the only possible approach is the one you described and it's totally ok 😄

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            • HieruH Offline
              Hieru
              last edited by

              @optimaforever said:

              The objective is to be able to get rid of some redundant loops that only add useless polys and keep adding details only where that matters...nobody seems to talk about this?

              It's something that's occurred to me before and I've tried to deal with it by adapting my approach to creating control meshes and also removing loops after subdivision.

              I just assumed that there isn't a way around creating so much unnecessary geometry.

              www.davidhier.co.uk

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              • thomthomT Offline
                thomthom
                last edited by

                Yea, due to how the SketchUp API is - SUbD have to create entities for the subdivision. At some point during development I had a small polygon optimisation in that coplanar quads was not triangulated. But that turned out to be bad for performance when doing stuff like adjusting creasins - as SketchUp's Auto-fold have too much overhead when it kicks in. Also, in order to keep the subdivided entities in sync with the control mesh I cannot omit entities.

                So as things are now you would have to optimise the subdivided mesh yourself once you are confident you won't need the control mesh any more.

                Ideally I wish I could hook directly into the viewport - intercept how instances were drawn. But alas, that's not possible with the current API.

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

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                • C Offline
                  cuttingedge
                  last edited by

                  its been my practice to subdivide, and yes exploding at times, quadifying autofolded faces (takes a long time dealing with the diagonals).. It can be a pain with complicated meshes 😞. .. Even with perfectly done quads can all of a sudden triagulate when you toggle subd.

                  I wish autofold can be totally disabled..and wish loops can be moved by dragging instead of adding and removing...

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                  • HieruH Offline
                    Hieru
                    last edited by

                    Would it be possible to have a tool similar to crease, where you select two loops and SUbD doesn’t subdivide between those points?

                    Thinking about it, that sounds almost impossible to implement....just throwing it out there.

                    www.davidhier.co.uk

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                    • thomthomT Offline
                      thomthom
                      last edited by

                      @cuttingedge said:

                      its been my practice to subdivide, and yes exploding at times, quadifying autofolded faces (takes a long time dealing with the diagonals).. It can be a pain with complicated meshes 😞. .. Even with perfectly done quads can all of a sudden triagulate when you toggle subd.

                      SUbD will preserve quads from the original mesh. You will only see triangles if you have n-gons. (Note that quads from SUbD's process will be triangulated internally. But you can use QFT to toggle off triangulation of coplanar faces.

                      @cuttingedge said:

                      I wish autofold can be totally disabled..and wish loops can be moved by dragging instead of adding and removing...

                      AutoFold cannot be disabled because it kicks in when a planar face is transformed such that the points are no longer planar. There is no way around that

                      I second your wish for better loop adjustment control. A while back I did start on experimenting with better tools for that. Not complete, but there is an Offset Loop tool in latest QFT. (Though that's only for inserting new ones. Being able to move existing ones would be nice.)

                      @hieru said:

                      Would it be possible to have a tool similar to crease, where you select two loops and SUbD doesn’t subdivide between those points?

                      Thinking about it, that sounds almost impossible to implement....just throwing it out there.

                      SUbD is using OpenSubdiv for the subdivision process - I don't have that kind of control Also the algorithm wouldn't be able to cope with exceptions like that.

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

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                      • HieruH Offline
                        Hieru
                        last edited by

                        I thought as much. Since no two meshes will be the same, it probably means you would need some kind of AI to interpret how something is subdivided.

                        www.davidhier.co.uk

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                        • thomthomT Offline
                          thomthom
                          last edited by

                          Yea, it would be too complex to code understanding of such asymmetric mesh I'm afraid.

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

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                          • vanpiV Offline
                            vanpi
                            last edited by

                            I saw a lesson on modeling a car rim in a blender. I decided to repeat it in a SketchUp.


                            car rim

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                            • HornOxxH Offline
                              HornOxx
                              last edited by

                              👍 👍 Congratulations! - this is a clean and accurate work, a very complex shape and nice as well! 😄
                              could you please show the raw geometry as well?

                              never trust a skinny cook

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                              • vanpiV Offline
                                vanpi
                                last edited by

                                Timelapse video of modeling : https://youtu.be/VFQd16gp2e0

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                                • HornOxxH Offline
                                  HornOxx
                                  last edited by

                                  @vanpi said:

                                  Timelapse video of modeling...
                                  👍 👍 😄 & Thanks!

                                  never trust a skinny cook

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                                  • thomthomT Offline
                                    thomthom
                                    last edited by

                                    @vanpi said:

                                    I saw a lesson on modeling a car rim in a blender. I decided to repeat it in a SketchUp.

                                    Very nice! I'm happy to hear that workflow from other software packages could be transferred into SketchUp.

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

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                                    • O Offline
                                      optimaforever
                                      last edited by

                                      Really cool timelapse!
                                      I see you have the same issues as me with autofolds and mirrors (delete, remirror, redelete, reremirror, etc.). And to flatten faces you use scale?

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                                      • HornOxxH Offline
                                        HornOxx
                                        last edited by

                                        An old and popular German board game
                                        "Mensch ärgere Dich nicht"
                                        A not so complicated SubD task - I know 😉 just a little Saturday afternoon exercise
                                        (below I share the step by step model of the cube at least)


                                        Board Game Render 1600.jpg


                                        Q1.skp

                                        never trust a skinny cook

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                                        • thomthomT Offline
                                          thomthom
                                          last edited by

                                          We call it "Ludo" 😄

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

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                                          • HornOxxH Offline
                                            HornOxx
                                            last edited by

                                            😄 thanks fpr that info Thomas & sorry for the German claim - I thought it was like this

                                            never trust a skinny cook

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