Difference between Cesium.Camera & Cesium.FrustumGeometry

Hello Cesium community.

I have an new Cesium.FrustumGeometry object with position and orientation, presented as Cesium.Quaternion.

My goal is to set the Camera oriented directly as FrustumGeometry.

The problems is when i convert Cesium.Quaternion to Cesium.HeadingPitchRoll, and use Cesium.Camera.setView() method, the camera does not set properly.

Here is Sandcastle representing my issue.

Thank in advance, appreciate any help.

P.S. I’ve already asked the same question in other thread, but did not got any answers, so duplicating it.