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    Arcs and Circle question

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    • thomthomT Offline
      thomthom
      last edited by

      CurveSegments.png

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

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      • thomthomT Offline
        thomthom
        last edited by

        But question is, maybe you should be using a different tool that doesn't segment curves...?

        When I used the laser cutter I used either Rhino or Illustrator. Mainly Rhino. Never have to worry about the segmentation then. Worth considering if you're using the right tool for the right job.

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

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        • jason_marantoJ Offline
          jason_maranto
          last edited by

          Illustrator still segments -- just at a very fine level.

          Best,
          Jason.

          I create video tutorial series about several 2D & 3D graphics programs.

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          • thomthomT Offline
            thomthom
            last edited by

            @jason_maranto said:

            Illustrator still segments -- just at a very fine level.

            ey? I've never seen that - not even when zoomed to the max.

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

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            • jason_marantoJ Offline
              jason_maranto
              last edited by

              The preview is dynamic to keep it smooth at whatever zoom -- but Bézier curves are segmented to whatever the RIP (or whatever output device) decides at output time... technically there is no curve at all (until it is output) as it is just a visual construct for our needs.

              But there is no device that I know of that can output a true Bézier curve without converting in some fashion (even a computer monitor).

              Best,
              Jason.

              I create video tutorial series about several 2D & 3D graphics programs.

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              • thomthomT Offline
                thomthom
                last edited by

                Ah, yes - like that. Gotcha.

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

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                • C Offline
                  Cubcrafter
                  last edited by

                  Thanks guys.
                  I also have Rhino but I am trying to use SketchUp for all of my work. I have a commercial model building project for the U. S. Coast Guard. A generic cruise ship model for training classes. This is 8 feet long, 15 1/2" wide and 30" tall. This has all been created with SketchUp. I then export .svg files of the faces of the components, open these files with Corel and then send them to the laser.
                  I am working on the funnel right now and want to make it as smooth as I can.

                  Thanks

                  Larry


                  CruiseShip.JPG


                  CruiseShip2.JPG

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                  • jason_marantoJ Offline
                    jason_maranto
                    last edited by

                    If you are not already using this http://forums.sketchucation.com/viewtopic.php?p=100509 I would use it, as it can dynamically change the segments like circles/arcs and is very flexible.

                    BTW Thomthom I feel like a fool saying anything at all to you since I eagerly await your outstanding looking "Bezier Surface" plugin.

                    Best,
                    Jason.

                    I create video tutorial series about several 2D & 3D graphics programs.

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                    • thomthomT Offline
                      thomthom
                      last edited by

                      @jason_maranto said:

                      I eagerly await your outstanding looking "Bezier Surface" plugin.

                      I'm eager to get it out there as well. But it's a somewhat bigger task than I first thought. But it will come. When you see the update of Vertex Tools you can be sure Bezier Surface will speed up production. (They both share some code I'm currently working on. So they both benefit.)

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

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                      • Jean LemireJ Offline
                        Jean Lemire
                        last edited by

                        Hi folks.

                        See attached image to see that SU accept up to 9999 sides in the Entity info window. At 10000 it gives the message shown by Thomthom. Is the limit 999 or 9999 ?

                        Funny.


                        Circle segmentation.JPG

                        Jean (Johnny) Lemire from Repentigny, Quebec, Canada.

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                        • thomthomT Offline
                          thomthom
                          last edited by

                          Segments.png

                          It's 9999 - the messagebox is lying. Maybe it was an old limit and the text not updated.

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

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                          • C Offline
                            chrisjk
                            last edited by

                            On the Mac it appears to be 1000 upper limit.

                            https://img.skitch.com/20120229-k14suabby1eurqf2di8g8bsrjf.jpg

                            Chris

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                            • TIGT Offline
                              TIG Moderator
                              last edited by

                              With 360 segments a circle has only 1 degree subtended for each segment, irrespective of the segments' length.
                              With more segments the shorter the segment length for the same radius; but the sensible [self-imposed] upper limit should be something like 1.mm [or a lot less to be practical for large radii!].
                              The circumference of a circle is 2PIr, so to work backwards from a radius to 1.mm segments use
                              numsegs=(2*Math::PI*radius/1.mm).to_i
                              As the radius increases the number goes up proportionally...
                              radius >>> numsegs
                              1.mm >>> 6
                              5.mm >>> 31
                              10.mm >>> 62
                              50.mm >>> 314
                              100.mm >>> 628
                              1000.mm >>> 6283
                              etc...
                              Note that ~1591.mm is therefore the radius limit as ~9999 segments gives segments of ~1.mm long.
                              So a circle about 3m/10' across is the limit for 1/mm segments... BUT of course thousands of circle segments translates to many more thousands of edges and facets when it's extruded into 3d... which is a sure fired way to kill your model! So don't be silly!! 😒

                              TIG

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