Entity orientation issue: ignore of the pitch angle


I want add an entity which contains a simple 3D-model on the scene:

    var position = Cesium.Cartesian3.fromDegrees(

    var orientation = Cesium.Transforms.headingPitchRollQuaternion(

but after adding, the model rotated only by heading and roll. The pitch angle ignored. If I put same values into Sandcastle example - everything work fine. I use Cesium 1.31. Please, help me.

Do you have a larger code snippet? This works fine for me in the 3D Models Sandcastle as you mention.