cione-comp-lib/es/node_modules/claygl/src/camera/Perspective.mjs

`$ yarn add cione-comp-lib` 或者 `$ npm i cione-comp-lib -S`

import Camera from "../Camera.mjs";
var Perspective = Camera.extend(
  {
    fov: 50,
    aspect: 1,
    near: 0.1,
    far: 2e3
  },
  {
    updateProjectionMatrix: function() {
      var rad = this.fov / 180 * Math.PI;
      this.projectionMatrix.perspective(rad, this.aspect, this.near, this.far);
    },
    decomposeProjectionMatrix: function() {
      var m = this.projectionMatrix.array;
      var rad = Math.atan(1 / m[5]) * 2;
      this.fov = rad / Math.PI * 180;
      this.aspect = m[5] / m[0];
      this.near = m[14] / (m[10] - 1);
      this.far = m[14] / (m[10] + 1);
    },
    clone: function() {
      var camera = Camera.prototype.clone.call(this);
      camera.fov = this.fov;
      camera.aspect = this.aspect;
      camera.near = this.near;
      camera.far = this.far;
      return camera;
    }
  }
);
var PerspectiveCamera = Perspective;
export { PerspectiveCamera as default };