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If you don't like to idea of keeping the player always inside a building and never allowing him to look outside, then you need a skybox. A skybox will give the player a good illusion that there is an outside to your level. A skybox is a huge box with textures that shows what is outside. However, creating these textures is a bit tricky, otherwise, it might just look like the inside of a textured cube.
But there is good news, because there is a free tool that is great for making these textures. It is called Terragen.
Please consult the terragen documentation about how to create a world, as I will only explain, how to export the map file to Crystal Space.
When you are done creating your world peform the following steps:
Open the "Rendering Controls" panel.
Now create six images and store them. Use the following settings for these images:
Texture Name Suffix Camera Head Camera Pitch Camera Bank _f
0 0 0 _r
90 0 0 _b
180 0 0 _l
270 0 0 _u
0 90 0 _d
0 270 0
Convert the generated bitmaps to a format readable by `map2cs' (TGA, JPG, JPEG, BMP, WAL).
Then you need to add a setting "skybox" with the value of your basename in the general world properties. (For example, if your textures are called `sample_f.bmp', `sample_r.bmp', you will set "skybox" to "sample"). Now every brush you assign the classname "cs_sky" will look like your skybox. Just try this out. It is a really amazing effect.
This screenshot doesn't really do justice to the skybox effect, but it looks quite nice, never-the-less. To really appreciate the effect you will need to move around a world in Crystal Space using a map enclosed within a skybox.
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