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    [Plugin][$] Curviloft 2.0a - 31 Mar 24 (Loft & Skinning)

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    • fredo6F Offline
      fredo6
      last edited by

      Just a precision on some issues mentioned in the previous posts. Curviloft may have problem to identify the right contours in PRE-SELECTION mode.
      However, you can always default to the MANUAL selection mode, where you have options to select curves only, or even the contours edge-by-edge.
      Tangent at vertex.gif

      Fredo

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      • jeff hammondJ Offline
        jeff hammond
        last edited by

        @unknownuser said:

        Just a precision on some issues mentioned in the previous posts. Curviloft may have problem to identify the right contours in PRE-SELECTION mode.
        However, you can always default to the MANUAL selection mode, where you have options to select curves only, or even the contours edge-by-edge.

        Fredo

        oh nice. thanks for clearing that up.
        i keep finding all these little options and i gotta admit, i'm very impressed..

        for one, the spline lofting is great.. at first, i was set on skinning and trying to form all of the encompassing curves but in many cases, it seems as if loft will actually make my life way easier.. especially once i started experimenting with the different spline methods.. namely, the two junction by orthogonal curve methods..

        i'm sure i'll have some questions soon about what's actually happening with those but for now, i'll continue experimenting with them.

        dotdotdot

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        • cmeedC Offline
          cmeed
          last edited by

          Thanks fredo6 for the latest update. letting you know that the Tent1.skp happily skinned on my mac
          cheers

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          • fredo6F Offline
            fredo6
            last edited by

            @unknownuser said:

            especially once i started experimenting with the different spline methods.. namely, the two junction by orthogonal curve methods..

            Jeff,

            Note that these two methods, by arc of ellipse and by arc of Bezier, are correct for straight junctions, but I still need to work out the case where you end up with an S-curve (I only implemented an approximate solution, due to lack of time).
            I am interested in your evaluation, because I added the methods just for trial, not being sure this corresponds to real situations.

            Fredo

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            • jeff hammondJ Offline
              jeff hammond
              last edited by

              @unknownuser said:

              Jeff,

              Note that these two methods, by arc of ellipse and by arc of Bezier, are correct for straight junctions, but I still need to work out the case where you end up with an S-curve (I only implemented an approximate solution, due to lack of time).
              I am interested in your evaluation, because I added the methods just for trial, not being sure this corresponds to real situations.

              Fredo

              here's a simple example.. i've added some notes to the skp showing things that aren't possible with other sketchup lofting/skinning plugins and i've only seen them in rhino.

              i'll compile a few other examples a little bit later that show some of the problems and other advantages i've seen..

              [edit - the lofted surface in the attached skp was formed using the two curves on the left side with the spline method set to ortho bezier]


              JH_curviloft1.skp

              dotdotdot

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              • fredo6F Offline
                fredo6
                last edited by

                Jeff,

                It seems the S-curves are working fine in your case (contours are in parallel planes).
                The two methods are designed to ensure tangential continuity between contours, so that you can chain them in one block. Below is your model, slightly amended, where the whole shape is generated in one pass.

                JH Curviloft1.gif

                Fredo

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                • Dave RD Offline
                  Dave R
                  last edited by

                  Fredo, just another thank you. The Skinning function turns out to be the perfect tool for sculpting seats such as this one for a Welsh stick chair.

                  http://farm5.static.flickr.com/4115/4921293579_b75e5519da_z.jpg

                  Thank you.

                  Etaoin Shrdlu

                  %

                  (THERE'S NO PLACE LIKE)

                  G28 X0.0 Y0.0 Z0.0

                  M30

                  %

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                  • mitcorbM Offline
                    mitcorb
                    last edited by

                    @Fredo6:
                    This tool may be in beta, but the couple of times I have used it show that it is very effective, and, once again I must salute you for your talent, and thank you for your generosity.
                    Humbly,
                    mitcorb

                    I take the slow, deliberate approach in my aimless wandering.

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                    • E Offline
                      Efrado
                      last edited by

                      FREDO you HIT IT AGAIN!
                      THANK YOU 😍 😍

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                      • fredo6F Offline
                        fredo6
                        last edited by

                        @dave r said:

                        Fredo, just another thank you. The Skinning function turns out to be the perfect tool for sculpting seats such as this one for a Welsh stick chair.

                        http://farm5.static.flickr.com/4115/4921293579_b75e5519da_z.jpg

                        Thank you.

                        Dave,

                        By chance, i found your video on YouTube explaining how to build the chair.
                        [url]http://www.youtube.com/watch?v=7UGgcMqMg0I]video[/url]

                        Fredo

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                        • Dave RD Offline
                          Dave R
                          last edited by

                          Fredo, that's not my video although the chair seat is the same one. The guy who did the video and I have been working with another fellow who is learning SketchUp by drawing one of his Welsh stick chairs. I used the same idea (we came up with independently) although I took it a little farther and refined the scoop out for the seat. Instead of a video, I described the process here.

                          Etaoin Shrdlu

                          %

                          (THERE'S NO PLACE LIKE)

                          G28 X0.0 Y0.0 Z0.0

                          M30

                          %

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                          • fredo6F Offline
                            fredo6
                            last edited by

                            Dave,

                            Oops!, I should have noticed the differences! I am not specialist of Welsh chairs definitely 😳
                            Anyway, an interesting use case of the tool.

                            Fredo

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                            • Dave RD Offline
                              Dave R
                              last edited by

                              No worries.

                              I've got a project in my mind that I'm thinking this plugin will make fairly easy to do. We'll see if I can pull it off.

                              Etaoin Shrdlu

                              %

                              (THERE'S NO PLACE LIKE)

                              G28 X0.0 Y0.0 Z0.0

                              M30

                              %

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                              • jeff hammondJ Offline
                                jeff hammond
                                last edited by

                                i copy/pasted this quote by Fredo from his BezierSpline thread:
                                http://forums.sketchucation.com/viewtopic.php?p=266254#p266254

                                @unknownuser said:

                                PS: on my long list of things to evolve is precisely a tool to draw splines with control of tangents.

                                i'm assuming a lot of the things you've done with bezierspline are happening in curviloft as well? (and if i'm off the mark there, sorry for mixing the two discussions together)

                                i guess my ultimate question is if you do in fact succeed with tangential control of spline could we also expect to see that type of feature in curviloft?

                                i'll attach a skp which might get confusing as it's talking about two separate things at once 😄
                                JH_curviloft2.skp

                                part of that skp shows the kinking (that i'm sure you're already aware of) that can be cause by the S-curves and how i've dealt with them using the skinning function of curviloft.. (and actually, i've just realized that it's the creation of the single S-curves while lofting that i'm really liking about the loft.. i guess if these could be created on their own and tangential then they would be more than helpful enough to just use them and curviloft's skinning.. so yeah, bear with me, i'm not exactly sure what i'm asking here 😄.. i do know that it's those profiles and/or rails are the hardest thing to create no matter which skinning option i choose.. those outer lines of these types of blends are seldom a radius or ellipse which are really the only curves i can draw with any sort of ease in sketchup which will remain smooth and tangent. )

                                the other note (at the bottom) shows areas that i'm still concerned with as far as continuity between the joining surfaces goes.. i haven't checked but just by the looks of it, i think the joint is a valley instead of smooth and continuos.

                                are there any settings within the curviloft beta that may help smooth some of that out?

                                dotdotdot

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                                • H Offline
                                  hebeijianke
                                  last edited by

                                  THX for your great job
                                  I have a question
                                  What does this mean
                                  THX


                                  0.png

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                                  • fredo6F Offline
                                    fredo6
                                    last edited by

                                    @hebeijianke said:

                                    What does this mean (the two gray icons)
                                    THX

                                    The Spline methods Bspline and FSpline are only avilable when you have at least 3 contours.

                                    The idea is to take connect the first and last contours by a spline curve (BSpline or FSpline), taking the intermediary contours as guides only. So the shape won't exactly passes through these intermediary contours, but the general geometry would look smoother.

                                    I did not work deeply on these two methods, so they may not work well in certain cases.

                                    And for the wrong tooltip TTIP_SplineMethod_Cunic, that's just a bug. It is for Cubic Bezier junctions.

                                    Fredo

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                                    • H Offline
                                      hebeijianke
                                      last edited by

                                      THX
                                      This is just your typo
                                      Thank you for your answer


                                      0.png

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                                      • charly2008C Offline
                                        charly2008
                                        last edited by

                                        Hi,

                                        I love this curviloft.


                                        Armreif0.jpg


                                        Armreif1.jpg


                                        Armreif1.jpg

                                        He who makes no mistakes, makes nothing

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                                        • G Offline
                                          Gillman
                                          last edited by

                                          Thanks for putting together such a great tool. For the life of me, I couldn't generate a smooth curve to intergrate a jet engine intake into an aircraft fuselage. In a few seconds, your tool generated exactly the shape I wanted. I can't wait to experiment some more with it.

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                                          • jeff hammondJ Offline
                                            jeff hammond
                                            last edited by

                                            hi Fredo,

                                            so i had a chance to do some more experimenting and i've definitely found a way to accurately draw some of the things i've been trying for a couple of years now. 😄 (well, i haven't yet found the exact parameters etc. that will best work for my application but i have found a way to insure tangency throughout the blends.. what degree of continuity i'm not sure but i'll be taking some of this SU data into rhino for further info on that.. i do believe however that you could roll through these blends with some 55mm wheels and be just fine 😉 )

                                            the process involves a lot of manual drawing but i don't mind. my main concern has always been being able to draw it in the first place. i'll probably find some shortcuts as i further refine this method but there might be something of interest for you in your development of tangential control of splines or even your nurbs idea i've seen you mention a few times..

                                            i've made a 4x speed video showing the process i used for drawing the splines to generate the surface and then for editing the surface created by said splines. just in case it's not clear what i'm doing in the video, here's a quick rundown..

                                            basically, i create extensions from the surfaces i'd like to join then use those extensions to set the B-spline control points.. apparently, the Bspline is in fact tangent at the tip of the extension.

                                            i then create the surface with curviloft using these B-splines.. in the example, i then further extend my guides then edit the splines which changes curvature but maintains tangency.. this is very nurbs like behavior (well, at least to me it is 😄 ).. i couldn't figure out a way to edit multiple spline's control points at once but if that ability exists, please let me know..

                                            here's the skp from the video which still uses the same shape as the one i originally posted here -- though i have edited to curves to share the same amount of segments (loving the polyline segmentor for this !!)

                                            JH_curviloft3.skp

                                            [flash=660,405:35qw1lfi]http://www.youtube.com/v/8B0RXSW66no?fs=1&hl=en_US&rel=0&color1=0x2b405b&color2=0x6b8ab6&border=1[/flash:35qw1lfi]

                                            i also tried a similar technique on a 3 tube blend with surprising success.. the sides came out sweet and the tops (which i basically freehanded with F-splines) are almost there.. one more go at it and i'd have it.

                                            tubeblend_unfinished.jpg
                                            tubeblend.skp

                                            anyway, maybe there's something that might trigger a method in you but if not, don't sweat it.. i'm super hyped on these tools as is.. Thanks so much for writing these!

                                            dotdotdot

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