Custom Sky Textures
A mission designer may pick a custom sky texture, fitting the scenario in question. Use the "Options -> Sky Texture.." menu item in the Mission Designer to pick a texture.
It is also possible to create completely new sky textures, the following things are important:
- The center of the texture orients south; west is at the left quarter, east is to the right of the center.
- The lowest line determines the color of the fogging that is applied to the scene, so it should be a nearly neutral grey, usually.
- Texture dimensions should be 2:1, e.g. 1024x512.
It seems that these textures need to the placed into the "eSim Games\SB Pro PE\textures\sky" subdirectory of your PRO PE installation folder.