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PIX: 1.#IO - what does it means

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Hi everybody. I saw few time strange value in PIX for Window in Debbuger. My vector had ( -0.000, -0.000, -0.000, 1.#IO ). What does last component means?

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If you're using vs_3_0/ps_3_0 or higher, than that probably means you've got a divide-by-zero. Earlier shader models returned 0 on a divide by 0, but SM3.0 and up return a NaN.

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