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How can draw partial area with Direct3D?

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Hi. When use render-to-texutre, I want to get image of partial area. For example, size of hole rendering image is 400 * 400. I want to get partial area image(begin 100,100; width 100; height 100). I refer to this article. http://www.mvps.org/directx/articles/tilerender/index.htm But, this method is't robust in rotation. How can i get?

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