threejs---第一人称控件 PointerLockControls

左手的ㄟ右手 2022-09-11 07:19 323阅读 0赞

## 先上效果图： ##

![在这里插入图片描述][7873aee0a23f4ebeb964da000c76e445.gif_pic_center]

## 1、引入插件 ##

...其他必要插件的引入...
    import {  PointerLockControls } from 'three/examples/jsm/controls/PointerLockControls'

## 2、定义相关变量 ##

data(){ 
    	return{ 
    	  selControls: null,
          moveForward: null,
          moveBackward: null,
          moveLeft: null,
          moveRight: null,
          canJump: null,
          prevTime: performance.now(),
          velocity: new THREE.Vector3(), // 移动速度
          direction: new THREE.Vector3(), // 移动方向
    	}
    }

## 3、初始化控件，并添加键盘监听事件 ##

methods：
    
    	selView () { 
          this.selControls = new PointerLockControls(this.camera, document.body)
          this.selControls.lock() // 锁定第一视角
          var onKeyDown = (event) => { 
            switch (event.keyCode) { 
              case 38: // up
              case 87: // w
                this.moveForward = true
                break
    
              case 37: // left
              case 65: // a
                this.moveLeft = true
                break
    
              case 40: // down
              case 83: // s
                this.moveBackward = true
                break
    
              case 39: // right
              case 68: // d
                this.moveRight = true
                break
    
              case 32: // space
                if (this.canJump === true) this.velocity.y += 350
                this.canJump = false
                break
            }
          }
    
          var onKeyUp = (event) => { 
            switch (event.keyCode) { 
              case 38: // up
              case 87: // w
                this.moveForward = false
                break
    
              case 37: // left
              case 65: // a
                this.moveLeft = false
                break
    
              case 40: // down
              case 83: // s
                this.moveBackward = false
                break
    
              case 39: // right
              case 68: // d
                this.moveRight = false
                break
            }
          }
    
          document.addEventListener('keydown', onKeyDown, false)
          document.addEventListener('keyup', onKeyUp, false)
        }

## 4、在循环渲染函数中，实现键盘控制移动 ##

methods：
    
    render(){ 
    		requestAnimationFrame(this.render)
    		// 实现第一人称视角
            const time = performance.now() //eslint-disable-line
            if (this.selControls) { 
              if (this.selControls.isLocked) { 
                var delta = (time - this.prevTime) / 1000
                this.velocity.x -= this.velocity.x * 10.0 * delta
                this.velocity.z -= this.velocity.z * 10.0 * delta
                this.velocity.y -= 9.8 * 200.0 * delta // 控制跳跃的高度
    
                this.direction.z = Number(this.moveForward) - Number(this.moveBackward)
                this.direction.x = Number(this.moveRight) - Number(this.moveLeft)
                this.direction.normalize() // 这确保了各个方向的一致运动
    
                if (this.moveForward || this.moveBackward) this.velocity.z -= this.direction.z * 200.0 * delta // 可控制移动的速度
                if (this.moveLeft || this.moveRight) this.velocity.x -= this.direction.x * 200.0 * delta // 可控制移动的速度
    
                this.selControls.moveRight(-this.velocity.x * delta)
                this.selControls.moveForward(-this.velocity.z * delta)
                this.selControls.getObject().position.y += (this.velocity.y * delta) // new behavior
    
                if (this.selControls.getObject().position.y < 5) { 
                  this.velocity.y = 0
                  this.selControls.getObject().position.y = 5 // 视角锁定时y轴的高度
                  this.controls.position0.set(0, 5, 10)
                  this.canJump = true
                }
              } else { 
                this.showBtn = true
              }
              this.prevTime = time
            }
    		this.renderer.render(this.scene, this.camera)
    }

[7873aee0a23f4ebeb964da000c76e445.gif_pic_center]: /images/20220828/a19c19fa4e534d979b3ba555d1932ab2.png