Unity笔记 Project01 Basic
coconutnut
 2020-11-30 20:55:58      

https://www.youtube.com/watch?v=pwZpJzpE2lQ&t=4178s&ab_channel=Imphenzia

实现

  1. 人物跳跃，左右移动

    • 跳跃速度与重量无关 -> ForceMode.VelocityChange

    • 跳跃时保持左右速度 -> rigidbodyComponent.velocity

    • 不可在空中跳跃 -> 检查Physics.OverlapSphere()

    • 左右移动同时检查←→AD -> Input.GetAxis(“Horizontal”)

    • 碰到墙壁不会因为长按D贴在墙上 -> 添加物理材质，摩擦力为0

  2. 摄像头跟随角色 -> 层级放在角色下即可

  3. 收集硬币

    • 不发生碰撞 -> 勾选是触发器
    • 检测碰撞 -> OnTriggerEnter()
    • 碰到后消除 -> Destroy(other.gameObject);

注意

  1. 在Update()中获取输入，在FixedUpdate()中apply physics
  2. 用[SerializeField] private，不要用public
  3. 减少不必要的Collider，提高效率
  4. 多用Prefab，善用Layer

代码

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using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Player : MonoBehaviour
{
    [SerializeField] private Transform groundCheckTransform = null;
    [SerializeField] private LayerMask playerMask;
    private bool jumpKeyPressed;
    private float horizontalInput;
    private Rigidbody rigidbodyComponent;

    // Start is called before the first frame update
    void Start() {
        rigidbodyComponent = GetComponent<Rigidbody>();
    }

    // Update is called once per frame
    void Update() {
        horizontalInput = Input.GetAxis("Horizontal");

        // Avoid jumping in the air (always colliding with the capsule collider)
        if(Physics.OverlapSphere(groundCheckTransform.position, 0.1f, playerMask).Length == 0){
            return;
        }

        if(Input.GetKeyDown(KeyCode.Space)){
            jumpKeyPressed = true;
        }
    }
    
    // FixedUpdate is called once every physic update (Default 100/s)
    private void FixedUpdate() {
        if(jumpKeyPressed){
            rigidbodyComponent.AddForce(Vector3.up * 5,ForceMode.VelocityChange);
            jumpKeyPressed = false;
        }

        rigidbodyComponent.velocity = new Vector3(horizontalInput * 2, rigidbodyComponent.velocity.y, 0);
    }

    private void OnTriggerEnter(Collider other) {
        // Collide with 9.Coin layer
        if(other.gameObject.layer == 9){
            Destroy(other.gameObject);
        }
    }

}