glTF lighting change in 1.36

[hpinkos]

The CesiumMilkTruck-kmc model is completely black when not lit by the sun in 1.36. This was not the case in 1.36. Was this change intentional? @lilleyse

1.35:

1.36:

Load this example and move the timeline so it's night.

var viewer = new Cesium.Viewer('cesiumContainer');

var position = Cesium.Cartesian3.fromDegrees(-123.0744619, 44.0503706, 0);
var heading = Cesium.Math.toRadians(135);
var pitch = 0;
var roll = 0;
var hpr = new Cesium.HeadingPitchRoll(heading, pitch, roll);
var orientation = Cesium.Transforms.headingPitchRollQuaternion(position, hpr);

var entity = viewer.entities.add({
    position : position,
    orientation : orientation,
    model : {
        uri : '../../SampleData/models/CesiumMilkTruck/CesiumMilkTruck-kmc.glb',
        minimumPixelSize : 128,
        maximumScale : 20000
    }
});
viewer.trackedEntity = entity;

[lilleyse]

Should be better now - fixed here: CesiumGS/gltf-pipeline#313

[pjcozzi]

OK to close?

[lilleyse]

Yeah