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Viewport Z for background

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I want to render a sky in background of all my geometry. So I tried to set viewport MinZ and MaxZ to 1 (like it says in DirectX SDK documentation) but I still have geometry behind like if z was not to 1.

If I change my vertex shader by changing z position to w it works.

Any idea why it does works with the viewport ?

Thanks Edited by Eric Cannet

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