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Direct3D vs. OpenGL Coordinate System OpenGL 3.2 and More

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Direct3D vs. OpenGL Coordinate System Conventions Window origin conventions Direct3D = upper-left origin OpenGL = lower-left origin Pixel center conventions Direct3D9 = pixel centers at integer locations OpenGL and Direct3D 10 = pixel centers at half-pixel locations Makes pixel centers for rasterization “match” texel centers for texturing Clip space conventions Direct3D = [-1,+1] for XY, [0,1] for Z OpenGL = [-1,+1] range for XYZ Affects How projection matrix is loaded Fragment shaders that access the window position Point sprites have upper-left texture coordinate origin OpenGL already lets application choose lower-left or upper-left

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