Question

请帮忙把unity的update函数的每行代码都注释一下

public float movementSpeed = 6.0f;//小球运动的速率
private Vector3 horizontalMovement;//小球水平运动
//这里理解为小球前后运动
private Vector3 verticalMovement;
void Update()
{
horizontalMovement = Input.GetAxis("Horizontal") * Vector3.right * movementSpeed;
verticalMovement = Input.GetAxis("Vertical") * Vector3.forward * movementSpeed;
Vector3 movement = horizontalMovement + verticalMovement;
rigidbody.AddForce(movement, ForceMode.Force);
}

Answer 1

horizontalMovement = Input.GetAxis("Horizontal") * Vector3.right * movementSpeed;
verticalMovement = Input.GetAxis("Vertical") * Vector3.forward * movementSpeed;
分别获取横竖轴上的移动量×右或者前×速度；（就是你的输入对小球的影响）
Vector3 movement = horizontalMovement + verticalMovement;
把2个分量相加，算出总的
rigidbody.AddForce(movement, ForceMode.Force);
然后小球受到一个大小方向为movement的力