I just wanted to comment on this… I have been playing around with creating a mapshot today and had thought that it requires a megatexture. I actually found out that a megatexture isn’t needed and that the mapshot command will still take a mapshot even if your map only includes brushwork.
I also found out that the mapshot images generated are .tga files that may look black, white, or transparent or a combination of them all. This happens when you open these .tga files in an image editor like paint.net or view the thumbnails through Windows Explorer. My program I made to stitch the images together somehow stitches these bad images together and fixes them so they are colored. I think this is the same issue that taking levelshots has. The thread “[Question] How to take a good screenshot of ET:QW?” hints at the same issue and individuals there thought it had something to do with the alpha channel of the tga. Whatever it is, the image data is in fact in the .tga files it just needs a bit of work being reformatted somehow.
I also found you can turn bots off with “bot_enable 0” and then kill all existing bots with “killBots”. This way they won’t appear in the mapshot.