Opacity?

[Sai Asuka]

Is there such thing as opacity for geojson data source and/or entity/primitive styling?

I don't see anything related to it here:

http://cesiumjs.org/Cesium/Build/Documentation/GeoJsonDataSource.html

[Sai Asuka]

Say for example I have a cube with a poly line inside of it. So I want to adjust the fill opacity of the cube so I can see the polyline.

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[OHTSUKA Ko-hei]

Color attribute which is instance of Cesium.Color has an alpha channel.

2015/02/23 3:17、Sai Asuka <asuka...@gmail.com> のメッセージ:

[Hyper Sonic]

Ya, check out the Sandcastle here

http://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=Geometry%20and%20Appearances.html&label=Showcases

it makes 5 translucent boxes each with this code (line 129) alpha being the opacity

    entities.add({
        position : Cesium.Cartesian3.fromDegrees(-106.0, 45.0, height),
        box : {
            dimensions : new Cesium.Cartesian3(10000.0, 90000.0, 90000.0),
            outline : true,
            outlineColor : Cesium.Color.WHITE,
            outlineWidth : 2,
            material : Cesium.Color.fromRandom({alpha : 0.5})
        }
    });

[Matthew Amato]

This example should tell you everything you want to know: http://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=GeoJSON%20and%20TopoJSON.html&label=Showcases

There are two ways to do it. You can configure the default stroke and fill for all features at load time; or you can modify the color of specific features after loading is done (the above example does both). As already mentioned, colors in Cesium have an alpha channel. There's a lot of ways to specify a Color, so I would also check out the Color documentaiton: http://cesiumjs.org/Cesium/Build/Documentation/Color.html.  "withAlpha" is probably the easiest if you want a known color name (Cesium.Color.RED.withAlpha(0.5)

[Sai Asuka]

Thank you, this is very clear.