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- Fix light direction (should be inverted). #1658

Job	Run time
Python SDist	0s
Build (Linux_GCC_9_Python37, ubuntu-20.04, gcc, 9, 3.7, -DMATERIALX_BUILD_SHARED_LIBS=ON)	13m 38s
Build (Linux_GCC_12_Python311, ubuntu-22.04, gcc, 12, 3.11, ON)	20m 17s
Build (Linux_GCC_13_Python312, ubuntu-22.04, gcc, 13, 3.12, ON, -DCMAKE_EXPORT_COMPILE_COMMANDS=ON)	14m 29s
Build (Linux_GCC_CoverageAnalysis, ubuntu-22.04, gcc, None, None, ON, -DMATERIALX_COVERAGE_ANALYS...	9m 21s
Build (Linux_Clang_10_Python37, ubuntu-20.04, clang, 10, 3.7, -DMATERIALX_BUILD_SHARED_LIBS=ON)	10m 46s
Build (Linux_Clang_15_Python312, ubuntu-22.04, clang, 15, 3.12, ON, ON)	14m 21s
Build (Linux_Clang_DynamicAnalysis, ubuntu-22.04, clang, 15, None, -DMATERIALX_DYNAMIC_ANALYSIS=O...	16m 53s
Build (MacOS_Xcode_11_Python37, macos-11, xcode, 11.7, -DMATERIALX_BUILD_SHARED_LIBS=ON, 3.7)	18m 26s
Build (MacOS_Xcode_14_Python311, macos-13, xcode, 14.3, 3.11)	14m 36s
Build (MacOS_Xcode_15_Python312, macos-13, xcode, 15.0, 3.12, ON)	16m 45s
Build (iOS_Xcode_15, macos-13, xcode, 15.0, None, -DMATERIALX_BUILD_IOS=ON -DCMAKE_OSX_SYSROOT=`x...	2m 39s
Build (Windows_VS2019_Win32_Python37, windows-2019, x86, 3.7, -G "Visual Studio 16 2019" -A "Win3...	13m 32s
Build (Windows_VS2022_x64_Python311, windows-2022, x64, 3.11, -G "Visual Studio 17 2022" -A "x64"...	12m 22s
Build (Windows_VS2022_x64_Python312, windows-2022, x64, 3.12, -G "Visual Studio 17 2022" -A "x64"...	10m 47s
Python Wheels	0s
	3h 8m 52s

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