by _o_OOOO_oo-Kanawha » Thu Nov 12, 2015 1:17 pm
I don't think much can be done about the Moire in certain track.
Contrary to MSTS and Open Rails where track and switches come in pieces, much like a model train set, Railworks' track is constructed dynamically.
It is a 3D roadbed/ties "base" and separate rails floating slightly above the base. When you lay track in Railworks, it is a continuous ribbon. In switches tracks have to be cut and welded together and the switch appears as by magic.
In switches, the tangent (straight) and diverging (curved) track "bases" get overlaid on top of each other, meaning the rendering engine has to make choices as what to show and what to hide. At shallow viewing angles, like from your locomotive cab, this lead to the ugly Moire effect. Some 3D track is more prone to Moire than other. Press 2 and when in outside view, raise your viewpoint and the Moire goes away.
Overall, there seems to be a "Moire horizon" at a certain distance from the viewer, where close together overlaid/parallel planes/surfaces of 3D objects, be it track, roads or signs, get indistinguishable by the rendering engine (z-buffering). When you zoom in, you'll get lots more of z-buffering errors, even in distant scenery, because at the greater distance from your viewpoint, objects appear closer together due to perspective distortion (I think).
Like the Old Prof said, changing your viewing angle means the close together planes get rendered differently, with less or more Moire depending on how they overlap.
There are said to be bugs in the Railworks rendering engine, and design flaws in many layered objects, compounding the effect in some cases. You'll notice for instance in many signs and billboards, the creator used a blank base, and glued the actual sign on top of that. Zoom in and out and you can see the rendering engine fighting with what to display.
Reducing the "sharpness" of your view helps a bit, you can try to play with the anti-aliasing options in the Settings\Graphics\Advanced menus.
Perhaps with the promised new Unreal 4 game engine come new renderers, more powerful and less prone to z-buffering and other display errors. We'll have to wait and see.
Edwin "Kanawha"
The Chessie, the train that never was ... (6000 hp Baldwin-Westinghouse steam turbine electric)