writeRay method

void writeRay(Ray out, { required Vector3 origin, required Vector3 forward, required Vector3 screenRight, required Vector3 up, })

Writes the active controller ray, falling back to head gaze on release. A touch pad uses a head-relative frontal hemisphere; IMU/driver poses supply a world-space direction. The origin is a 3DoF estimate, not 6DoF.

Implementation

void writeRay(
  Ray out, {
  required Vector3 origin,
  required Vector3 forward,
  required Vector3 screenRight,
  required Vector3 up,
}) {
  out.origin.setFrom(origin);
  if (!_pointerActive) {
    out.direction.setFrom(forward);
  } else if (!_relativePointer) {
    out.direction.setFrom(_pointerForward);
  } else {
    final yaw = _laserX * math.pi / 2;
    final pitch = _laserY * 1.25;
    final f = math.cos(yaw) * math.cos(pitch);
    final r = math.sin(yaw) * math.cos(pitch);
    final u = math.sin(pitch);
    out.direction.setValues(
      forward.x * f + screenRight.x * r + up.x * u,
      forward.y * f + screenRight.y * r + up.y * u,
      forward.z * f + screenRight.z * r + up.z * u,
    );
  }
  if (_validDirection(out.direction)) out.direction.normalize();
}