The -0.5 pixel offset is needed in DirectX 9 to correctly match the texture coordinates:
http://msdn.microsoft.com/en-us/library/windows/desktop/bb219690(v=vs.85).aspx
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Namespace: DeltaEngine.GraphicsAssembly: DeltaEngine.Graphics (in DeltaEngine.Graphics.dll) Version: 1.1.1.0 (1.1.1)
Syntax
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Type: StringSee Also