正交相机

const camera = new THREE.OrthographicCamera(
          -aspect,
          aspect,
          aspect,
          -aspect,
          0.1, //进平面
          1000 //远平面
        ); // 透视相机

创建相机辅助线

const cameraHelper = new THREE.CameraHelper(this.camera);

创建一个透视相机观察正交相机

 // 创建透视相机
        const watchCamera = new THREE.PerspectiveCamera(
          75,
          this.width / this.height
        );
        // 在正交投影后，距离人眼更近
        watchCamera.position.set(2, 2, 6);
        watchCamera.lookAt(this.scene.position);
        this.scene.add(watchCamera);
        this.camera = watchCamera;
        this.watchCamera = watchCamera;

上面的

GUI调试相机参数：dat.gui
可以配置设置对象的属性：可以是number和boolean类型和方法类型，点击gui插件方法名称时，会执行改方法
npm install --save dat.gui

import * as dat from 'dat.gui';
...,
const gui = new dat.GUI();
        let params = {
          wireframe: false,
          switchCamera: () => {
            if (this.camera.type === 'OrthographicCamera') {
              this.camera = this.watchCamera;
              // 鼠标控制拖动开启
              this.orbitControls.enabled = true;
            } else {
              this.camera = this.otherCamera;
              this.orbitControls.enabled = false;
            }
          },
        };
        gui.add(this.camera.position, 'x', 0.1, 10, 0.1);
        gui.add(this.camera, 'near', 0.01, 10, 0.01).onChange((val) => {
          this.camera.near = val;
          // 矩阵更新函数
          this.camera.updateProjectionMatrix();
        });
        gui.add(this.camera, 'far', 1, 100, 1).onChange((val) => {
          this.camera.far = val;
          // 矩阵更新函数
          this.camera.updateProjectionMatrix();
        });
        gui.add(this.camera, 'zoom', 0.1, 10, 0.1).onChange((val) => {
          this.camera.zoom = val;
          // 矩阵更新函数
          this.camera.updateProjectionMatrix();
        });
        gui.add(params, 'wireframe').onChange((val) => {
          this.mesh.material.wireframe = val;
        });
        gui.add(params, 'switchCamera');

透视相机