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A Viewport Tool is a tool that allows you to interact with the Viewport in a specific way. Often times a Viewport Tool will provide a manipulator within the viewport for quick/easy access to the intended functions. A Viewport Tool can also provide additional settings that control how the tool functions and/or how you interact with it. These settings are found in the Tool Settings pane.
Below is a list of interface elements that a Viewport Tool can exist within:
Below is a list of Viewport Tools: