1. Find a good 360 degree cube map of a sky online. A good source I found was cgtextures.com. There you can get a single image of a cube map which is six sides of the cube, but all in one long horizontal image.
2. Crop and save the individual sides of the cube map and replace the images that come with VBE. The file names tell VBE where each image goes so they all get stitched together correctly. Attached is a diagram of how I deciphered the faces of the VBE cube map.
The files are located in:
MAC: Applications:Graphisoft:Virtual Building Explorer 2:Data:Textures:Skybox
WIN: c:\Program Files\Graphisoft\virtual Building Explorer\Skybox
In windows they are .bmp files and on mac they are .tga files with names like XN.tga, YP.tga, etc.
It is important you save the original files before you alter them in case you screw up. You have been warned.
[NOTE: for some reason I had to flip each image of the cube map (flip vertical command) so they would stitch correctly. I'm not sure why because the original images that came with VBE are oriented with the sky up. Mine are sky down, but appear sky up in VBE...whatever.]
3. Save out your model from AC to VBE. Now it will use the new sky
4. If you find a few skies you will want to use, just make the cube map for VBE and save them somewhere on your computer and you can swap them out in VBE whenever you make a new VBE file.
Have fun
After
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