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I have a problem with the terrain "dissapearing" when i load a sprite/image onto the screen. please visit the link for a visual reference to the problem.


This does not happen from a higher camera angle just when the camera is near the terrain.

NOTE: The camera is NOT touching the terrain, this problem happens with fog on and fog off, it happens with the camera view distance at a very close range and at a very long range, it happens with Backdrop on or off and with skybox on.
ive tried to load sprites first, load sprites last, ive tried culling the terrain, ive tried not culling the terrain, ive tried it in 16 bit and 32 bit colour, ive tried changing the type/colour/size/position/transparency/alpha of the sprite. ive tried pasting an image to the screen instead of using a sprite. all of these yeild the same results. Your help will be much appreciated...
http://www.zombizzles.com/files/rich/terrainproblem.html

That would be the anti aliasing. For some really strange reason, when you render a sprite to the screen it disables anti-aliasing which is causing your problem

Neat. Well in some kind of vain attempt to fix it, ill trawl the DirectX documentation. Thanks for your help