Calculate the position of an element inside a photosphere

Question

Im using an a-sky element to display a 360° photosphere.

My problem is that I have to place inside the photosphere some elements that must act like \'markers\'; but I do

Answer 1

Sorry for answering my own question but this time was really easy:

function sphericalCoordsToVector3(distance, latitude, longitude){
  return new THREE.Vector3(
    distance * -Math.cos(latitude) * Math.cos(longitude),
    distance * Math.sin(latitude),
    distance * -Math.cos(latitude) * Math.sin(longitude)
  );
}

Where distance is the distance from the centre (camera) where we want to put our element.

Just for the records, the opposite function is:

function vector3ToSphericalCoords(vector) {
  var phi = Math.acos(vector.y / Math.sqrt(vector.x * vector.x + vector.y * vector.y + vector.z * vector.z));
  var theta = Math.atan2(vector.x, vector.z);
  return {
    longitude: theta < 0 ? -theta : (Math.PI * 2.0) - theta,
    latitude: (Math.PI / 2.0) - phi
  };
};

The original functions can be found here: mistic100/Photo-Sphere-Viewer (there are also nice functions to get the position of the element inside the screen)