movement.cs

Vector3 movingDirecion;
public float speedMagnification; //調整必要　例10
public RigidBody rb;
public Vector3 movingVelocity;

void Start(){
	rb = Getcomponent<RigidBody>();
}

void Update() {
	float x = Input.GetAxisRaw("Horizontal");
	float z = Input.GetAxisRaw("Vertical");
	movingDirecion = new Vector3(x, 0, z);
	movingDirecion.Normalize();//斜めの距離が長くなるのを防ぎます
	movingVelocity = movingDirecion * speedMagnification;
}

void FixedUpdate() {
	if (jumpNow == true) return;
	rb.velocity = new Vector3(movingVelocity.x, rb.velocity.y, movingVelocity.z);
}