when people make bgs and characters using 3d editing software or level editors how to they export the 3d images into AGS?
BFAQ (http://americangirlscouts.org/agswiki/index.php/Graphics%2C_Characters%2C_Text_%26_Rooms#Using_3D_characters_and_backgrounds)
If you don't know how to save the images in your 3D program ... That's not really AGS Technical.
are you asking to import any image as a background or just 3d-rendered images? if it's 3d ones i think you'll just select render in your 3d program and save the image, then import it as any other type of image!