자동차 속도계는 일반적으로 바퀴의 회전 속도를 측정하여 표시합니다. 간혹 자동차는 전진하지 않을 수도 있는데(옆으로 미끌어질 수도 있으므로), 이 경우 해당 운동 방향은 속도계가 측정할 수 없습니다. 오브젝트의 rigidbody.velocity 벡터의 크기는 전체 운동의 해당 방향에 대한 속도를 알려주므로 전진 속도만을 알고 싶은 경우 벡터 내적을 사용해야 합니다.
var fwdSpeed = Vector3.Dot(rigidbody.velocity, transform.forward);
물론 방향은 어떤 방향이든 무관하지만, 이 연산을 하려면 방향 벡터를 정규화해야 합니다. 결과가 속도 크기를 더 정확하게 측정할 수 있을 뿐만 아니라, 크기를 계산하는 동안 느린 제곱근 연산을 피할 수 있도록 하기 때문입니다.
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