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    [Plugin] Triangulate Points

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    • Rich O BrienR Online
      Rich O Brien Moderator
      last edited by

      @unknownuser said:

      I have experienced bad triangulation results of the whole group if it has complex organic shape

      What is the bad result?

      SU has problems skinning faces less than 1mm. If your points are closer than 1mm try scaling the point cloud up by 10 the Triangulating. Afterwards scaled it down by 0.1.

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      • TIGT Offline
        TIG Moderator
        last edited by

        If you examine the points cloud it occupies barely 1 sq mm - so some are very close!
        I scaled it up x100 and it faced fine...
        As Rich says you can make very small facets in Sketchup <~0.5mm will usually fail.
        I suspect the points were perhaps let's say in 'm' and you imported in 'mm' ?Capture.PNG

        TIG

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        • P Offline
          pav180
          last edited by

          Wow! While I was working on my reply TIG has triangulated my point cloud. Great! But it was a planar model and I did the same in SU 7.1 (I can still not manage TIG's package in SU 8), let's do something more difficult.

          I scan with my3dscanner.com, I receive and download a .ply point cloud, than I import it into SU as CSV via Cloud_V7.1 (6 or 8).

          I am testing SU plugins to triangulate. I get bad results if I try to triangulate the whole model either by Cloud_V8 or great TIG package.

          I have scaled the model, but it didn't work. I am a little confused about scaling (my3dscanner HAS NO SCALE AT ALL which is bad), but scaling proposed by Rich did not work for Lion model.

          My point is to illustrate bad results (this is what Rich has asked for) if you mesh the model as a whole and if it is complex, not planar.

          This is a workflow: .ply dense point cloud, csv sparse point cloud imported into SU, bad triangulation results.

          LionSUNotGood.jpg

          I do know that if I triangulate a model in portions it will work. Little by little. I also suspect model orientation is a key. You are welcomed to play with the file I tried to triangulate (unfortunately CSV format is not supported here).

          Please be forgiving to my questions and comments. Sadly I know very little about SU and I am here to learn, not to promote my3dscanner which I used to be one of the developers. I feel awkward discussing these matters with gurus of SU.


          LionScaled.skp

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          • TIGT Offline
            TIG Moderator
            last edited by

            You might have made it too big by x10 but that's better than too small...
            The use of a points cloud import is typically from surveyed land, so it's not expecting a 3D object - more a countoured surface.
            I suggest you slice you points in something like 'half' horizontally and then merge the two surfaces together later... More like making a mold or a face-mask than a full 3D object straight off...

            TIG

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            • P Offline
              pav180
              last edited by

              TIG,

              I see your point. Size limitation comment was very helpull as well. Thank you, guys!

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              • P Offline
                pav180
                last edited by

                And TIG, your triangulation plugin works in SU8 beautifully. I was a dumb head...

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                • thomthomT Offline
                  thomthom
                  last edited by

                  It does not respect "Cancel" as a response to the inputbox...

                  Thomas Thomassen — 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

                    It never did - even in Didier's original version!
                    If you cancel the layer naming dialog then it'll use layer 'nil' - e.g. 'Layer0'.
                    Once you run the tool it runs the processing to the end - the layer dialog only lets you determine a layer for the mesh-group if desired, with cancel canceling the layer naming but not the main tool's operation, which carries on relentlessly. Frankly the whole layer part could be omitted, it's results are all grouped and you could easily re-layer that as desired later... 😒

                    TIG

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                    • TIGT Offline
                      TIG Moderator
                      last edited by

                      Here's v1.1...
                      http://sketchucation.com/plugin/1110-tig_points_cloud_triangulation
                      It fixes an issue discovered with the encoding of the helper file "delauney3.rb" - which was found to be incompatible with SketchUp v2014 and Ruby2...

                      TIG

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                      • B Offline
                        Baumgarten87
                        last edited by

                        I don't know what I'm doing wrong. I'm working on Sketchup 2014, installed the latest compatible version of the extension and when trying to triangulate a point cloud it always tells me "no guide-points selected". What is that I might be doing wrong?

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                        • M Offline
                          Mill29
                          last edited by

                          Same here

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                          • TIGT Offline
                            TIG Moderator
                            last edited by

                            Are you actually selecting the guide-points before running the script ?
                            Remember that if they are inside a group/component you must edit it, then select them before running the script...

                            TIG

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                            • S Offline
                              schifezzevarie
                              last edited by

                              Hi Im' searching for the related "delaunay3.rb" pluging but I cannot find it, as the link in teh beginnig of teh post is not working. Could you fix that or give us a different link?
                              Thanks a lot. 😄

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                              • TIGT Offline
                                TIG Moderator
                                last edited by

                                Version 2.0 is available from the PluginsStore.
                                https://sketchucation.com/pluginstore?pln=TIG_points_cloud_triangulation
                                It fixes issues with delauney3.rb using Constants in away that newer SketchUp versions Ruby chokes on, t also includes some tweaks of the main code - Layers v. Tags etc, and the RBZ is now signed...

                                TIG

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