trip.three/lib/util/toWorldPosition.js

Three.js addon for Trip

'use strict';

var THREE = require('three');

var decimalAdjust = require('./decimalAdjust');

module.exports = function (width, height, camera, position) {
  var mouseX = position.x / width * 2 - 1;
  var mouseY = -(position.y / height) * 2 + 1;

  if (camera instanceof THREE.PerspectiveCamera) {
    var vector = new THREE.Vector3(mouseX, mouseY, 0.5);
    return vector.unproject(camera);
  } else if (camera instanceof THREE.OrthographicCamera) {
    var _vector = new THREE.Vector3(mouseX, mouseY, -1);
    var worldPos = _vector.unproject(camera);

    var q = camera.quaternion;

    var x = decimalAdjust(q.x, -3);
    var y = decimalAdjust(q.y, -3);
    var z = decimalAdjust(q.z, -3);
    var w = decimalAdjust(q.w, -3);

    var xPos = x === 0.5 && y === 0.5 && z === 0.5 && w === 0.5;
    var xNeg = x === -0.5 && y === 0.5 && z === 0.5 && w === -0.5;
    var yPos = x === 0 && y === 0.707 && z === 0.707 && w === 0;
    var yNeg = x === 0.707 && y === 0 && z === 0 && w === 0.707;
    var zPos = x === 0 && y === 0 && z === 0 && w === 1;
    var zNeg = x === 0 && y === 1 && z === 0 && w === 0;

    if (xPos || xNeg) {
      worldPos.x = 0;
    } else if (yPos || yNeg) {
      worldPos.y = 0;
    } else if (zPos || zNeg) {
      worldPos.z = 0;
    } else {
      console.warn('unsupported ortho camera for snapping');
    }

    return worldPos;
  }
};