Unity/3d/rigidbody

Rotation固定にscriptでチェックを入れる

Rigidbody rigidbody = obj.AddComponent<Rigidbody>();
rigidbody.constraints = RigidbodyConstraints.FreezeRotation;

x方向へ常に進んでいく

Rigidbody2D rigidbody;
rigidbody.velocity = new Vector2(1f, 0f);