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                                       Using gimp on turnouts
     
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1st message | this message only posted: 15 Jan 2008 04:07
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from:
Adrian
 

 

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Following on from the post on Point rodding pics
http://www.templot.com/forum/view_topic.php?id=169
I have been trialing the use of gimp to work out the geometry, so far with mixed sucess but I think I started at the deep end! So just reporting on progress.
As a reminder the starting point!
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2nd message | this message only posted: 15 Jan 2008 04:13
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Adrian
 

 

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I then used the shear and perspective tools in gimp as detailed by Martyn.
It worked quite easily to get something that looked right. Unfortunately when loaded as a background shape in Templot it was difficult to get anything matching. I then realised that despite being careful on the use of the perspective tool I had mis-judged it slightly so I was getting gauge widening through the turnout. If I set the approach road to the right gauge then it'd be 8% to 10% out at the crossing.
So now I use the measure tool in gimp to check the gauge is constant through the turnout before loading it into Templot.
Looks are deceptive, in the photo it looks like the gauge is wider at the top than the bottom, but the gauge is in fact a constant width through the turnout.
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3rd message | this message only posted: 15 Jan 2008 04:29
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Adrian
 

 

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On my previous attempt I stretched the image too much in Templot so on Martyns suggestion tried something a little shorter.
So this attempt is a 12ft switch and a 1:6 crossing.
Looking reasonable I'd be happy to using at this standard but it's not quite right on the match. The curve on the rails on the turnout sides doesn't quite match between the switch and the crossing. Using a slightly shallower crossing might help but increases the overall length.

I'll still perservere because it's been quite instructive in the geometry of the turnouts and the interaction between the switch settings and crossing.

Adrian
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4th message | this message only posted: 17 Jan 2008 03:49
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Adrian
 

 

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Hopefully some one will correct me if I'm getting this wrong. I wasn't happy with the previous attempt as the centre crossing just didn't align correctly.
looking at the photo it seemd to me that for the left hand turnout in particular the section between the left-hand crossing and the centre crossing was virtually straight.
I had visions of mixing and matching all sorts of part templates to get the geometry but then I found the option "length of entry straight in front of fine point" in the "real > V crossing options...".
So a little further tweaking has got me this far which I'm happier with. I think I'll crack on with the rest of the design now and see how it fits in the overall scheme.

Adrian
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5th message | this message only posted: 17 Jan 2008 04:09
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Martin Wynne
West Of The Severn, United Kingdom



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Adrian wrote: looking at the photo it seemd to me that for the left hand turnout in particular the section between the left-hand crossing and the centre crossing was virtually straight.Hi Adrian,

Well spotted. That's quite unusual I think.

I had visions of mixing and matching all sorts of part templates to get the geometry but then I found the option "length of entry straight in front of fine point" in the "real > V crossing options...".That mouse action was introduced in 091. Previously you could do it by entering the figures, but having it as a mouse action is proving incredibly useful. One of those "why didn't I think of this before" moments. :)

Note that it works only if the V-crossing is the regular type. There is no entry straight for the generic and curviform types of V-crossing.

Thanks for uploading your gimping results -- it's looking very promising. :)

regards,

Martin.
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6th message | this message only posted: 17 Jan 2008 04:19
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Please do not send requests for help direct to me via email or PM.

Post your questions on the forum where everyone can see them and add helpful replies.
I wrote: That mouse action was introduced in 091. Previously you could do it by entering the figures, but having it as a mouse action is proving incredibly useful. One of those "why didn't I think of this before" moments. :)Hi Adrian,

Oops! I just re-read your message and realised that you did enter the figures! Sorry about that. If you are using version 091b you can make that adjustment by mouse action -- action > mouse actions: real > adjust V-crossing entry straight menu item. It's very handy.

regards,

Martin.

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7th message | this message only posted: 17 Jan 2008 04:49
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Adrian
 

 

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Martin Wynne wrote:

Oops! I just re-read your message and realised that you did enter the figures! Sorry about that. If you are using version 091b you can make that adjustment by mouse action -- action > mouse actions: real > adjust V-crossing entry straight menu item. It's very handy.


Thanks for pointing that out, I am using 0.91b but I keep forgetting to check the "action" menu.

Adrian
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