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direct3d perspective projection

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Hi, I need to know the exact size of the unit cube the frustum is transformed by a perspective transformation matrix of direct3d (after homogenisation). I am not quite sure if it's [1, 1, 1]. And also, if the center of the unit cube is placed in the origin or maybe aligned to the x/y-plane. like that
|       |
|---1---2-------- z
|       |

I searched the direct3d docs, but found no specification according this, but maybe I am blind :) Thanks, constantin

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