BVE: Even more on curved objects

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  • smace
    Senior Member
    • Apr 2003
    • 481
    • .

    #1

    BVE: Even more on curved objects

    The curvedf object creator grew out of a curved rail creator and as such it has certain assumptions, which are usually not true with other objects.
    First, Your fans are probably because the basic short object from which you make the curve is much longer than 2.5 meters. The curve is created by adding up 10 short sections to get a 25 meter ( nominal) long object. Make sure the basic object you start with is about 2.5 meters long.
    Second, The assumptions in the curve builder are that the object is fairly narrow and it has a center line length of 25 meters and that the center line is where you determine the radius. With the platfroms this is not true. If you use a base object that is +-4 meters from a 0 center line, your base object is an 8 meter by 2.5 meter rectangle. If the radius of your curve is 200 meters the radius of the platform will be 100 +4 (1/2 the platform) + 2 meters ( the off set from the track) or 106 meters. If you have a wide curve, this will give you a fairly smooth curved platform, but if the curve is narrow, shuch as here. The inside radius of the platform is 106-4 or 102 meters and the out side is 106 + 4 or 110 meters. The inside mist be shorter than 25 meters and the outside longer, each by about 4%. Make the sides of your base object longer and shorter so that you are putting togethere trapazoids rather than rectangles. If your object if futher out from the center of the curve, you will longer ( and shorter sides) remember that the length of the object is still only 25 meters, so you will need to lengthen the beginnign and end sections of the final object code to cover those gaps.
  • mfonda
    Senior Member
    • Jul 2004
    • 231
    • Ottawa, Ontario, Canada.

    #2
    RE: Even more on curved objects

    Thanks, I will try both suggestions and see. In the mean time, does anyone know how to modify Switch15 to make narrow-gauge switches, etc? Or is there a special program? Martin

    Comment

    • ferrovipathe
      Senior Member
      • Apr 2003
      • 169
      • Paris, France.

      #3
      RE: Even more on curved objects

      Hi !
      Sorry, there is no maner to modify Switch15 to make narrow-gauge curves and switches. It's a stand alone program builded for standard gauge.

      If you want something in narrow gauge, you must rewrite a lot by hand.
      For curve, it is simple: you just must change X coordonates into your gauge. For example, if your gauge is a metric one, each rail is placed to -0.5 and +0.5 and not -0.72 and +7.20. So you got a little difference of 0.22 beween standard and narrow gauge. Compute the new X coordonates for rails, ties, and ballast, that's all.

      For switches, crossing and double slip, it's more difficult, because you must compute each new coordinate for frog, small parts of rails... And it's a long work...

      I think it's possible to use Excel to build such curves and switches, but nobody create it yet.

      That's perhaps why there is nearly no Narrow gauge routes in BVE.

      All the best.

      Comment

      • tof63
        Senior Member
        • Apr 2003
        • 392
        • Turin, Italy.

        #4
        RE: Even more on curved objects

        >
        >I think it's possible to use Excel to build such curves and
        >switches, but nobody create it yet.
        >
        Other then my "Curve 10" Excel spreadsheet, there is also the Japanese standalone program "Curverail Editer" suitable to build narrow track elements (both are also available in English and with both the gauge can be easy defined).

        More informations here: http://bve.altervista.org/utilities.html

        Sorry for narrow switches: these are not covered, but using overlapped rail elements and a little rewrite by hand of X coordinates, I've obtained this result:



        Cheers.
        Luigi Cartello


        Luigi Cartello

        http://bve.altervista.org

        Comment

        • mfonda
          Senior Member
          • Jul 2004
          • 231
          • Ottawa, Ontario, Canada.

          #5
          RE: Even more on curved objects

          That doen't look bad at all, Luigi. There is hope yet. Another question: What seems to be the standard track distance? or is there one. Some seem to use 3.8 meter, like Mackoy, and many British modellers. I have used 4m because it is easier. But is there a preferred distance? Martin

          Comment

          • ferrovipathe
            Senior Member
            • Apr 2003
            • 169
            • Paris, France.

            #6
            RE: Even more on curved objects

            Hi!
            There is no standard track distance in reality.
            We use 3.8m or 4 m because it's nearly the most used distance in real railways.
            But, for example, Metro in Paris run on standard track, but with a smaller distance between tracks. Metro trains are smaller than Sncf trains.
            And, British trains are smaller than Continentals, which are smaller than US.
            And, if TGV (or ICE) can run on standard tracks, distance between tracks on higth speed lines can reach 5 or more meters (trains are crossing each over about 600 Km/h ...and perhaps 700 Km/h in few years...)

            So, there is no standard track distance in reality, but 3.8m or 4 m are not a bad choice for standard European railroads.

            All the best.

            Comment

            • PNCs
              Member
              • Jul 2004
              • 23
              • Hobart, Tasmania, AUSTRALIA.

              #7
              RE: Even more on curved objects

              Hi Martin,
              The distance between tracks caused me concern some time ago so I looked for a site on 'real' railways that would tell me the answer. As other have said, there seems to be NO fixed standard, but the following site has provided me with some guidelines. There are many other sites though

              Pete

              Comment

              • Robertj
                Member
                • Jul 2004
                • 42
                • Maassluis Centrum, The Netherlands.

                #8
                RE: Even more on curved objects

                Okee, i have been asking around on the Dutch MSTS Forum. These are figures for Dutch tracks wich has a width of 1435 mm

                On free tracks it is:
                until +/- 1965 = 4.00 m (Hartline to hartline)
                After +/- 1965 = 4.50 m
                And for the HSL/GLV/ICE = 5.00 m
                HSL=high speed lines, on normal Dutch tracks there is a limit of 140km/h (may vary, but never more than this), HSL is obviously faster than that.

                On stations and such it is:
                Until +/- 1965 = 4.50 m
                After +/- 1965 = 5.00 m
                HSL/GLV/ICE= 5.50 m

                All these figures may vary, effects of local soil, speeds of trains crossing and such may increase or decrease the distance between tracks.

                Comment

                • mfonda
                  Senior Member
                  • Jul 2004
                  • 231
                  • Ottawa, Ontario, Canada.

                  #9
                  RE: Even more on curved objects

                  I am not familiar with your system, although Mr Mackoy uses a similar idea. Please let us have the rw file. Dutch comments don't faze me at all; I am Dutch. Martin

                  Comment

                  • smace
                    Senior Member
                    • Apr 2003
                    • 481
                    • .

                    #10
                    RE: Even more on curved objects

                    Send me your files and let me look at them, the excel sheet and the base code
                    Sanford

                    Comment

                    • TomBoyRacer
                      Senior Member
                      • Apr 2003
                      • 273
                      • Grimsby, N.E Lincs.

                      #11
                      RE: Even more on curved objects

                      *Overdue screenshot time!*

                      I have been working on curved platforms at york. I did this by generating a peice of track in switch (600m radius) and then using that as a guide. I can't get the tops of the platforms to display more than 4 faces though, so i had to cheat slightly. Anyone with any answers please get in touch! I solved the problem of cracking by putting in an extra diagonal piece of platform edging.


                      Comment

                      • mfonda
                        Senior Member
                        • Jul 2004
                        • 231
                        • Ottawa, Ontario, Canada.

                        #12
                        RE: Even more on curved objects

                        That is a very attractive scene. I like your platform; the roof and pillars are something else, almost an Indian character. I seem to have my platforms unser control, thanks to smace and his utility. Martin

                        Comment

                        • TomBeevers2000
                          Senior Member
                          • Nov 1999
                          • 475
                          • Doncaster, I apologise that we, United Kingdom.

                          #13
                          RE: Even more on curved objects

                          Like the shot, Tom. York has to be my favourite NR station :-).
                          --
                          Tom Beevers

                          Comment

                          • TomBoyRacer
                            Senior Member
                            • Apr 2003
                            • 273
                            • Grimsby, N.E Lincs.

                            #14
                            RE: Even more on curved objects

                            That reminds me I have to curve the roof as well!
                            Thanks for the compliments. The unsightly gap in the wall is due to the fact i was in the middle of realigning it in order to bring the houses closer in, so at least curves aren't giving me problems there.

                            So Martin, Did you have problems when constructing curved formL and formR objects? If i try and add more than 4 faces horizontally then BVE tries to adhere them to the track and not how i've built them.

                            Comment

                            • mfonda
                              Senior Member
                              • Jul 2004
                              • 231
                              • Ottawa, Ontario, Canada.

                              #15
                              RE: Even more on curved objects

                              There don't seem to be any more problems making curved objects; I just made 2 curved wall objects, that turned out perfectly. I have not yet tried to attach other things to it. We shall see. Martin

                              Comment

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