calculateTbRadius method

dynamic calculateTbRadius(
  1. Camera camera
)

Calculate the trackball radius so that gizmo's diamater will be 2/3 of the minimum side of the camera frustum @param {Camera} camera @returns {Number} The trackball radius

Implementation

calculateTbRadius(Camera camera) {
  var distance = camera.position.distanceTo(_gizmos.position);

  if (camera is PerspectiveCamera) {
    var halfFovV = MathUtils.deg2rad * camera.fov * 0.5; //vertical fov/2 in radians
    var halfFovH = Math.atan((camera.aspect) * Math.tan(halfFovV)); //horizontal fov/2 in radians
    return Math.tan(Math.min(halfFovV, halfFovH)) * distance * radiusFactor;
  } else if (camera is OrthographicCamera) {
    return Math.min(camera.top, camera.right) * radiusFactor;
  }
}