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I am mainly using Unity but I think that it's not related to this engine, and I am wondering what's the difference between using tex2D and Sample for sampling a texture.

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They represent the same operation, but Sample is what it's called in D3D10 and newer versions of HLSL, while tex2D is what it's called in D3D9 HLSL, and NVIDIA's (defunct) Cg language. By the way, the operation is also called texture in GLSL.

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  • $\begingroup$ Thanks Nathan ! Is this just a new call or does it also include some performance boost. I mean what does this call imply compared to the D3D9 version ? $\endgroup$ – MaT Dec 19 '16 at 7:13
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    $\begingroup$ @MaT It implies you're using D3D10+. ;) It's literally the same operation in hardware; they just redesigned the API and called it a different name. $\endgroup$ – Nathan Reed Dec 19 '16 at 14:51

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