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CloseA reference direction used to calculate contact angles.
Both Rigidbody2D.SlideMovement.surfaceSlideAngle and Rigidbody2D.SlideMovement.gravitySlipAngle use this to determine the surface angle.
NOTE: By default, this value is Vector2.up. The magnitude of this vector is unimportant however an exception will be thrown in the magnitude is zero.
Additional resources: Rigidbody2D.Slide and SlideResults.