To export to a .x is a export to direct x mesh, export terrain as bitmap will give you a 8 bit or 24 bit grayscale texture.
Quote: "I tried exporting the mesh but it didn't have an extension"
You might not have the latest version go to help/about check for latest version button 1.2.0.16 is the latest but you could export any mesh blitz,3ds,mdl5 the type wouldn't matter since you don't use the model file i only suggest optimizing to reduce the terrains poly count before saving your 8 bit that your terrain is built from.
Quote: "Also, if I do that, export the texture and the mesh, will it keep our wacky texturing? It's an entire planet, so the ground is made up of a lot of different colours and whatnot."
Don't really understand that but, yes if you export a mesh the texture is exported same as you see it in the editor or you can use export texture but i choose to optimize the terrain first because if you are saving a 8bit the grayscale it is blurred depending on the polys in the editor a very smooth level will create a very high poly terrain i usually use around 3000 to 5000 poly optimized terrains, i would suggest using edit/settings and setting your texture output size up from 256 to at least 1024 if it is a big terrain to keep the image quality up. You can also increase the size of the terrain by changing the edit/resize hight map size but 256 is usually large enough, 512 is a massive terrain.
someone else asked about terrains awhile ago and i posted a simple example of how any why i would use the optimize before exporting the 8 bit using a default texture.
http://forum.thegamecreators.com/?m=forum_view&t=49618&b=1
just in case that last reponse made no sense.
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