How to access cesium viewer instance

[monomoti]

Hello,

I'm customizing terriajs and it's a lot of fun.
Now I'm trying to control light and time (something like this ) of terria viewer, so I have to get the cesium viewer instance first.

Is there a way to do that?

Thanks in advance.

[monomoti]

UPDATE:

I managed to control lighting of terria viewer by in index.js. I know this is not a good way, though.

        setTimeout(()=>{
            const viewer = terria.currentViewer;
            const directionalLight = new Cesium.DirectionalLight({
                direction: new Cesium.Cartesian3(0.6289450511350295, -0.563156644510077, -0.5359876084359657),
            });
            viewer.scene.light = directionalLight;
        },3000);
        
        render(terria, [], viewState);

And I still don't know how to control clock. The viewer I got didn't have "clock" property.