Function
Allows the user to quickly create a projection line, starting from a camera's position.
Requires at least 1 camera to be present in the scene.
Procedure
Make sure you have at least 1 camera present.
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If only 1 camera is present, this routine will auto-select said camera
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If 2 or more cameras are present, it will prompt you to select which camera to use
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Run the routine
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Select which camera to use (in the case of multiple cameras present)
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Select the end point of your projection line