Hi,If i want to do a large LOD 17 photoreal through SBuilderX. For example, it's around 500 tiles wide by 300 tiles long.How should i divide it so it runs best on computers? should i do many .bgl's of 20x20 tiles? of 40x40?Anyone with experience who has found that balance?Thanks!Marc

Nobody?

Why are you equating the size of the file to it's performance in FSX? FSX loads what it needs to display, be it from one file or 20. In fact, the SDKs specifically cover performance issues with photo scenery where the is excessive "white space" in the file (my terminology). Paying attention to LOD boundaries when creating the BGL files will reduce the white space. Larger files inherently will have less chance of white space, unless you're compiling strictly along LOD boundary lines.

I think it was once said bigger is better, but I suppose there is some limit on that. You can use the .inf file to specify a LOD-based file tiling. You might experiment with LOD 12 or so and see what that does. scott s..