Templot Club Archive 2007-2020
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posted: 18 Nov 2011 17:47 from: Paulr1949
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Hi Attached is a box file I have been working on for a future club layout together with a screen dump. I was working on the curve from the 7th track from the bottom of the group at top right of the picture and was playing with various transition curve options in order to allow it to meet the second track from the right at the bottom right of the picture. Suddenly this happened - an outline of two railheads running straight between the two. Any ideas on what I've done wrong? Paul 1913_181246_180000000.png  |
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| Attachment: attach_1245_1691_SJ_2011_11_18_1736_39_error.box 187 | |||
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posted: 18 Nov 2011 19:03 from: Paulr1949
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After a couple of hit on CTRL-U, I got the original back and it seems to have worked OK since! Paul |
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posted: 18 Nov 2011 20:19 from: Martin Wynne
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Hi Paul, Thanks for posting the file. It's a long-standing known issue, not related to TDV.  Essentially you created a transition curve which was too gentle for the maths processor in your computer. "Too gentle" means the radius was changing by too little in too long a transition zone: initial radius at the track centre-line = 1310.63 mm final radius at the track centre-line = 1322.31 mm length along transition section = 1333.58 mm So the radius was changing by only 12 mm in a length of 1333 mm. The problem will disappear as soon as you change one of the radii, or shorten the transition zone. Generally when this happens you can split the difference in the radii and replace the transition with a fixed radius curve. Often the screen is more alarming, and you can create some startling effects.  More about this here: topic 1391 regards, Martin. |
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posted: 18 Nov 2011 22:04 from: Paulr1949
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thanks Martin Paul |
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