itowns/lib/Core/Math/Sphere.js

A JS/WebGL framework for 3D geospatial data visualization

"use strict";

var _interopRequireWildcard = require("@babel/runtime/helpers/interopRequireWildcard");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;

var THREE = _interopRequireWildcard(require("three"));

function Sphere(center, radius) {
  this.center = center || new THREE.Vector3();
  this.radius = radius || 1.0;
}

Sphere.prototype.constructor = Sphere;

Sphere.prototype.setCenter = function (center) {
  this.center.copy(center);
};

Sphere.prototype.setRadius = function (radius) {
  this.radius = radius;
};

var vector = new THREE.Vector3();
var pc = new THREE.Vector3();

Sphere.prototype.intersectWithRayNoMiss = function (ray) {
  ray.closestPointToPoint(this.center, pc);
  var a = pc.length();
  var d;
  var b; // TODO: recompute mirror ray
  // If the ray miss sphere, we recompute the new ray with point symetric to tangent sphere

  if (a > this.radius) {
    // mirror point is symetric of pc
    // The mirror ray must pass through the point mirrorPoint
    var mirrorPoint = pc.clone().setLength(this.radius * 2 - a); // Compute the new direction

    d = ray.direction.subVectors(mirrorPoint, ray.origin).normalize(); // Classic intersection with the new ray

    ray.closestPointToPoint(this.center, pc);
    a = pc.length();
    b = Math.sqrt(this.radius * this.radius - a * a);
    d.setLength(b);
    return vector.addVectors(pc, d);
  } // TODO: check all intersections : if (ray.origin.length() > this.radius)


  d = ray.direction.clone();
  b = Math.sqrt(this.radius * this.radius - a * a);
  d.setLength(b);
  return vector.subVectors(pc, d);
};

Sphere.prototype.intersectWithRay = function (ray) {
  ray.closestPointToPoint(this.center, pc);
  var a = pc.length();

  if (a > this.radius) {
    return undefined;
  }

  var d = ray.direction.clone();
  var b = Math.sqrt(this.radius * this.radius - a * a);
  d.setLength(b);
  return vector.subVectors(pc, d);
};

var _default = Sphere;
exports["default"] = _default;