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This Master Plugin defines the defaults for splines in the current scene. The settings are saved with the scene.
This is the colour used to draw the first knot in a spline (if Show Start/End Knots is enabled) and also to draw the main handle of the incoming control point of a knot.
This is the colour used to draw the last knot in a spline (if Show Start/End Knots is enabled) and also to draw the main handle of the outgoing control point of a knot.