Thank you for posting the error - indeed, I am working on it currently! 
Posts by Marcel Kuhnt
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A good start for your purpose could be this tutorial: https://www.lotus-simulator.de…torial-create-a-building/
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Please set this option:
Otherwise, the light will be invisible as soon as the graphics option "detailed lights" is switched off.
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By the way, all of the splines are saved as parts of the terrain? Like fences and stuff? So eg. if I build a detailed fence near the train route (like a metal fence from wires) will it add way to many polygons to the terrain, like the developed tie models?
Currently yes.
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Please post screenshots of the properties of your light source.
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Did you set this?
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Do you use a light/night texture and/or a light effect and which of them is all the day active?
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The catenary poles should always be scenery objects - like street lights etc. Of course, I understand the problem placing all poles separately, but there is a function planned to place scenery objects autmatically. But you should not place such complex objects as splines.
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OK, that sounds good! (Not that it was painful, but that the map is now less big...
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I think the ties are the problem here. I'm not really happy with this "tie technology" yet... on the one hand side, "backing" all ties (like we do now) would increase the running speed in the simulation but need more memory, rendering each tie separately would be bad for performance... The best solution would be 2D ties... but they are just 2D...
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First of all the unusual matter:
I have maybe 14km of mostly unbuild map, and even now it takes up 4GB. Is that normal?
Like Florian said already, the terrain may lead to high demand of memory. But the whole Munich map container (without buildings but including all streets, pavements, curbstones, wire...) is smaller than 2 GB...
In this case, the packing needs some time just because of the high size of data.
So I believe that you use some kind of special tracks etc. using very many polygons. What types of rail track (or other splines of all other types) did you use on that map?
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Did you try my proposed action?
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OK, mysterious... are the "missing" tracks still clickable? The first action would be to open their properties and confirm them with "OK".
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Sometimes rails go through the road polygons as well.
Hmm? I cannot see any height problems on your screenshots?
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Hope, you've clicked here to show the LOD object...?
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Each leave should be only a rectangle with a "sharp" transparent alpha channel texture mapped on it. Not more.
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I've got an idea... how is your performance, if you are in the 3D view? It would be great, if you post the screenshot with the performance dialog again, that's very helpfull!
PS:
Doesn't really seem to happen, because there isn't any core going full power mode.
Please, thrust me, this says nothing since the CPU management sees to not using only one core. So "each" command will be done by a different core, so it looks like all cores are doing something at exactly the same time. But this does not happen.
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I understand that the leaves let the trees be less detailed?
I don't understand that sentence...
I saw it. I wanted to read how to work with him. I understand that you need to select an object and click on the button?
Didn't you just try it out? If I would be at your position, I just would press all buttons and check out what happens!
Yes, just select the object, press this button and you will get your LOD version.
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Of course it would be better, if a tree has less polygons than more polygones...
So just try how it looks like and if the performance is good enough for your purposes! Here you can find the LOD function:
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You can import a tree the same way you can import any other scenery object. If it fits and has enough performance, you have to test.
There is a special function in the Object&VehicleTool (very upper left) to create a LOD mesh automatically, which we have used for our trees.
