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For compatibility reasons, `vulkan` is kept as the technical default for the setting, but projects created in Godot 4.6 and later will set `d3d12` as the driver automatically. Users upgrading to 4.6 are recommended to adopt `d3d12` as a default if it fits their needs. Enable `d3d12=yes` by default in SCons so that custom Windows builds include Direct3D 12 support.