[Test]
public void TrackRotationOfEmitterVisually()
{
    var emitterData = CreateTrackingParticleData();
    emitterData.SpawnInterval = 0;
    emitterData.BillboardMode = BillboardMode.Ground;
    emitterData.LifeTime = 1.0f;
    var emitter = new ParticleEmitter(emitterData, Vector3D.Zero);
    new Command(Command.Click, 
        () => emitter.Rotation *= Quaternion.FromAxisAngle(Vector3D.UnitY, 30.0f)); //ncrunch: no coverage 
    new Command(Command.MiddleClick, () => emitter.Spawn(1));
}

[Test]
public void TrackRotationOfEmitterVisually()
{
    var emitterData = CreateTrackingParticleData();
    emitterData.SpawnInterval = 0;
    emitterData.BillboardMode = BillboardMode.Ground;
    emitterData.LifeTime = 1.0f;
    var emitter = new ParticleEmitter(emitterData, Vector3D.Zero);
    new Command(Command.Click, 
        () => emitter.Rotation *= Quaternion.FromAxisAngle(Vector3D.UnitY, 30.0f)); //ncrunch: no coverage 
    new Command(Command.MiddleClick, () => emitter.Spawn(1));
}