demo-scene.yml

cameras:
    perspective:
        type: perspective
        vanishing_point: [0, -500]
lights:
    directional1:
        type: directional
        direction: [.1, .5, -1]
        diffuse: .7
        ambient: .5
styles:
    buildings:
        base: polygons
        animated: true
        shaders:
            blocks:
                color: |
                    color.rgb *= vec3(abs(sin(worldPosition().z + u_time)));

sources:
    mapzen:
        type: MVT
        url: https://abel.carto.com/api/v1/map/named/tpl_2c83b818_3ee4_11e7_9e4d_0e98b61680bf/1/{z}/{x}/{y}.mvt

layers:
    "3139ab79-d8ad-4d8e-ab46-21cc07e0faed":
        data: { source: mapzen }
        draw:
            polygons:
                order: |
                    function() {return Math.round(1000/feature.st_y);}
                style: buildings
                animated: true
                extrude: function () { return feature.height * 4; }
                color:  |
                    function () {
                        var h = feature.height * 8 || 20;
                        h = Math.min((h + 50)/ 250, .8);
                        h = Math.max(h, .4);
                        h = h + 0.2;
                        return [h, h, h];
                    }