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    [Plugin] BezierSpline - v2.2a - 22 Apr 21

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    • Dave RD Offline
      Dave R
      last edited by

      Was the polyline created with this plugin?

      Etaoin Shrdlu

      %

      (THERE'S NO PLACE LIKE)

      G28 X0.0 Y0.0 Z0.0

      M30

      %

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      • K Offline
        khanhvu86
        last edited by

        thanks

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        • H Offline
          herbert2000
          last edited by

          yes, i draw it with the plugin,...and sketchup pro ! i have XP PRO and an old PC, may be my config is too old . I will try with an old version of sketchup ! thanks for the response !

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          • Dave RD Offline
            Dave R
            last edited by

            Once you've drawn your polyline and finished it, right click on it and choose Edit Polyline. Then you should be able to move the points of the line around. If you can't do this, please describe what part of it you can't do.

            Etaoin Shrdlu

            %

            (THERE'S NO PLACE LIKE)

            G28 X0.0 Y0.0 Z0.0

            M30

            %

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            • I Offline
              ivreich
              last edited by

              New feature Suggestion

              Dear Fredo

              Do you think it would be useful/possible to have bezierspline incorporate a function to blend 2 bsplines by curvature/tangents in the same way that the "blend" command in rhino does?

              currently it's possible to do it manually by placing construction lines along the end segments of each bspline to simulate tangent guides, so i'm assuming it could be automated?

              Cheers,

              Joel

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              • jeff hammondJ Offline
                jeff hammond
                last edited by

                Hey Joel
                Yeah, I think that would be very useful. (blend curve by bezier -- or whatever it may be called)

                It be sweet if the first control point in on each end of the line were subsequently locked to the direction of the line being blended to. (ie- the construction line or guide if doing the blend manually)

                dotdotdot

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                • fredo6F Offline
                  fredo6
                  last edited by

                  @unknownuser said:

                  Hey Joel
                  Yeah, I think that would be very useful. (blend curve by bezier -- or whatever it may be called)

                  It be sweet if the first control point in on each end of the line were subsequently locked to the direction of the line being blended to. (ie- the construction line or guide if doing the blend manually)

                  Jeff and Joel,

                  Very good idea. I will do something in a frefresh of BezierSpline.

                  Fredo

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                  • jeff hammondJ Offline
                    jeff hammond
                    last edited by

                    nice! i'm glad you're into the idea.
                    i think it will be great and i'm sure a bunch of other people will be into it once they see what it does.

                    dotdotdot

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                    • D Offline
                      d12dozr
                      last edited by

                      Sounds like a great addition to an excellent tool! πŸ‘ Good idea, guys.

                      3D Printing with SketchUp Book
                      http://goo.gl/f7ooYh

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                      • pilouP Offline
                        pilou
                        last edited by

                        More is the friend of Better! πŸ˜‰

                        Frenchy Pilou
                        Is beautiful that please without concept!
                        My Little site :)

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                        • I Offline
                          ivreich
                          last edited by

                          Sweeeet. fredo responded to my post! im a little starstruck now...

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                          • H Offline
                            herbert2000
                            last edited by

                            it's impossible for me to edit polylign....

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                            • I Offline
                              ivreich
                              last edited by

                              NEW FEATURE SUGGESTION: "MEAN CURVE"

                              Hi again Fredo

                              I know it hasn't been long since my last feature suggestion ("blend curve by bezier"), but here's another one you might be interested in:

                              The "mean curve" command in Rhino creates an intermediate or "average" curve between two existing curves, which is especially useful for adding detail to contour maps and such. Is it possible for Bezierspline to do the same?

                              I have attached an image showing how I imagine it would be done manually; i.e. draw connecting lines linking corresponding vertices on the two original curves, then drawing a third curve linking all the midpoints of those connecting lines to create an "average" curve.

                              What do you reckon? The added advantage of Bezierspline automating this is that the generated curve would be an editable bspline as well. Does anyone else think this is a good idea?

                              Cheers,

                              Joel


                              ![Drawing an "average" curve manually](/uploads/imported_attachments/aud3_MeanCurve.jpg "Drawing an "average" curve manually")

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                              • C Offline
                                carlofacultatif
                                last edited by

                                merci fredo!!!!!

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                                • jeff hammondJ Offline
                                  jeff hammond
                                  last edited by

                                  @ivreich said:

                                  NEW FEATURE SUGGESTION: "MEAN CURVE"
                                  Does anyone else think this is a good idea?

                                  Cheers,

                                  Joel

                                  hey Joel
                                  i'm not quite convinced that your manual method is actually giving a mean curve.. i assume you're just connecting vertices then drawing segments through the midpoints.. i guess it sort of looks ok in the example you posted but it's not going to always work out that way.. see these two curves (well, one curve that's been copy/flipped)..

                                  mean.skp

                                  try your manual method on those and you'll soon run into problems.
                                  while it might be possible to make a plugin that can do an actual mean curve (or something close to it) in sketchup, i think it's going to be much more difficult then simply playing connect the dots.

                                  dotdotdot

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                                  • I Offline
                                    ivreich
                                    last edited by

                                    Hi Jeff

                                    Thanks for replying. You're right; the manual method is simply "connecting the dots" as you say. It was the most logical way of illustrating my point. I think I see your point though; the manual method presumes a more regular spacing/matching of vertices between the two curves.

                                    I suppose complex pairs of curves would have to be "rebuilt" (pardon the Rhino lingo; I've just finished working at a firm where Rhino is pretty much a religion: if it isn't built in Rhino it isn't worth looking at) to match each other's vertices before the manual method can be used.

                                    I don't know the math behind creating mean curves, it was just an idea that popped into my head one day at work. Any other suggestions?

                                    Cheers,

                                    Joel

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                                    • jeff hammondJ Offline
                                      jeff hammond
                                      last edited by

                                      @ivreich said:

                                      I suppose complex pairs of curves would have to be "rebuilt"

                                      this is where sketchup really starts to breakdown as far as trying to make it nurbs like..
                                      you can, in essence, rebuild a curve using this plugin.. if you right click on one of the curves in the mean.skp then go BZ- Convert To --> Polyline Divider (or polyline segmentor) then you'll be able to set the curve's vertices to an equal spacing (or to an evenly divided # of segments)..

                                      the problem is, you end up with too many vertices in the looser parts of the curve Or too few in the tighter areas. (at least in the example sketchup.. these commands come in very handy for many situations)..

                                      re: mean curve in rhino.. personally, i don't use it or have a use for it (that i know of πŸ˜‰ )but one thing that sort of surprises me is that illustrator actually has a mean curve command that is seemingly superior to rhino's.. with illustrator, you can choose the amount of divisions (ie- 2 new mean curves in between the original ones).. you can do it with rhino by repeating the command as long as you want an odd amount of average curves but even then, it takes a lot longer than doing it once..

                                      but hey, i guess i'm going way off topic here πŸ˜„

                                      dotdotdot

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                                      • fredo6F Offline
                                        fredo6
                                        last edited by

                                        It's relatively easy to do it.
                                        Actually, I have this type of function embedded in Curviloft
                                        The only remaining part would be to build a decent GUI for selecting the curves.

                                        Fredo

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                                        • jeff hammondJ Offline
                                          jeff hammond
                                          last edited by

                                          oh yeah. i guess with curviloft you can do exactly this as long as the curves are in 3D space (i can't get it to work if both curves are flat and on the same plane)

                                          starting curves on left & right sides.. the other four curves could be considered mean curves.

                                          dotdotdot

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                                          • TIGT Offline
                                            TIG Moderator
                                            last edited by

                                            EEbyRails will make the average-curve between the two rails if the Profiles are a straight-line curve made from two equal length edges [use divide on a line drawn between the curves ends and weld as a curve]. This works in full 3d AND in 2d even if the curves are flat and even coplanar... Just erase the mesh's ribs and use the 'spine' edges to weld into an averaged-curve... Capture.PNGObviously the average is 1/2 but if you wanted to weight the result - let's say a 3rd then divided the profile line in three, erase the ribs and the two mid- spines are at 1/3 from their nearest 'rail'...

                                            TIG

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