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According to https://en.wikipedia.org/wiki/3Dconnexion, 3D mice are: human interface devices for manipulating and navigating computer-generated 3D imagery. These devices are often referred to as 3D motion controllers, 3D navigation devices, 6DOF devices (six degrees of freedom) or a 3D mouse. Applications that want to support 3D mice on Linux are expected to either use spacenavd and its library, or consume the HID output directly. This patch makes it possible for a number of applications that use 3D mice directly to work out of the box, such as PrusaSlicer and its derivatives.
Files in this directory specify a description of hardware devices, in the form of mappings from modalias-like keys (which identify specific hardware devices) to udev properties. Files in this directory are not read by udev directly. Instead, man:systemd-hwdb(8) compiles them into a binary database. See man:hwdb(7) for an overview of the configuration file format, and man:systemd-udevd.service(8) for a description of the udev daemon. Use 'systemd-analyze cat-config udev/hwdb.d' to display the effective config.