CZML, color, interval, rgba not working

I have tried to faithfully follow the examples offered in the forum & documentation.

Both https://github.com/AnalyticalGraphicsInc/czml-writer/wiki/RgbaValue and https://github.com/AnalyticalGraphicsInc/czml-writer/wiki/RgbafValue claim an ISO date-time string is accepted:

“If it has five or more elements, they are time-tagged samples arranged as [Time, Red, Green, Blue, Alpha, Time, Red, Green, Blue, Alpha, ...], where Time is an ISO 8601 date and time string or seconds since epoch”

polygon:material:solidColor:color:interval,rgba or rgbaf only works with RGBAF values
The following Sandcastle example shows a polygon that changes color every 4 months as you drag the timeline back & forth. The viewer zooms to the polygon when its added, but it is not rendered with RGBA values for 6 months of the year, only renders when RGBAF values are provided.

Please advise, is it a bug, or am I doing something wrong?

Thanks-

-Jon

var viewer = new Cesium.Viewer(‘cesiumContainer’);
var czml = [{
“name”: “test”,
“description”: “foo”,
“version”: “1.0”,
“id”: “document”,
“clock”: {
“currentTime”: “2017-01-01T08:00:00Z”,
“interval”: “2017-01-01T00:00Z/2017-12-31T24:00Z”,
“range”: “LOOP_STOP”,
“step”: “SYSTEM_CLOCK_MULTIPLIER”,
“multiplier”: 1
},
“properties”: null
}, {
“id” : “CutlerRiiverDrainage”,
“name”: “Dynamic Polygon with Intervals”,
//“availability”:“2017-01-01T00:00Z/2017-12-30T24:00Z”,
“polygon”: {
“material”: {
“solidColor”: {

“color”: [{
“interval” : “2017-01-01T00:00:00Z/2017-03-31T24:00:00Z”,
“rgbaf” : [0, 1, 1, 1]
},{
“interval” : “2017-04-01T00:00:00Z/2017-06-30T24:00:00Z”,
“rgba” : [128, 128, 128, 1]
},{
“interval” : “2017-07-01T00:00:00Z/2017-09-30T24:00:00Z”,
“rgbaf” : [0, 1, 0, 1]
}, {
“interval” : “2017-10-01T00:00:00Z/2017-12-31T24:00:00Z”,
“rgba” : [205, 28, 36, 1]
}]

        }
    },
    "positions": {
        "cartographicDegrees": [ -71.292850344999977, 44.278876842000045, 0, -71.29256382799997, 44.278926193000075, 0, -71.292214586999933, 44.278858058000026, 0, -71.291236990999948, 44.27889385900005, 0, -71.290885743999979, 44.278870442000027, 0, -71.290560561999939, 44.278685148000079, 0, -71.290093912999964, 44.27875060100007, 0, -71.289230971999984, 44.278814744000044, 0, -71.288274033999983, 44.278995802000054, 0, -71.287060233999966, 44.279242989000068, 0, -71.286382585999945, 44.279491950000079, 0, -71.286217244999989, 44.279826352000043, 0, -71.285374022999974, 44.280443203000061, 0, -71.284953325999936, 44.280609275000074, 0, -71.284346892999963, 44.280657490000067, 0, -71.283950482999956, 44.280672910000078, 0, -71.283553092999966, 44.280839053000079, 0, -71.283061689999954, 44.281122114000027, 0, -71.28254620599995, 44.281522326000072, 0, -71.281915793999985, 44.281670932000054, 0, -71.28088896, 44.281834945000071, 0, -71.280002213999978, 44.281965928000034, 0, -71.279092479999974, 44.282046584000057, 0, -71.27841620099997, 44.282077782000044, 0, -71.277834052999935, 44.281975316000057, 0, -71.277360236999982, 44.281874552000033, 0, -71.277074771999935, 44.281439626000065, 0, -71.276591571999973, 44.281101698000043, 0, -71.275985619999972, 44.280975081000065, 0, -71.274179930999935, 44.280072149000034, 0, -71.27347305, 44.279484344000025, 0, -71.272945715999981, 44.279270796000048, 0, -71.272400215999937, 44.27918173200004, 0, -71.271394649999934, 44.279190712000059, 0, -71.270847258999936, 44.279094461000057, 0, -71.270288583999957, 44.278676234000045, 0, -71.269441564999966, 44.278312103000076, 0, -71.268306816999939, 44.278342699000063, 0, -71.266442495999968, 44.278301635000048, 0, -71.265402610999956, 44.278260623000051, 0, -71.263612122999973, 44.278554825000072, 0, -71.262186166999982, 44.278348917000073, 0, -71.260678479999967, 44.278268840000067, 0, -71.25804636099997, 44.27819216000006, 0, -71.256871266999951, 44.278430858000036, 0, -71.254230672999938, 44.278967194000074, 0, -71.253710057999967, 44.279034092000074, 0, -71.253192966999961, 44.278920604000064, 0, -71.253118547999975, 44.278455257000076, 0, -71.253246961999935, 44.278049262000025, 0, -71.253676122999934, 44.27648535000003, 0, -71.253242860999933, 44.275497821000044, 0, -71.253541489999975, 44.273526974000049, 0, -71.253288706999967, 44.272651716000041, 0, -71.25293011499997, 44.270458676000032, 0, -71.252894888999947, 44.266846302000033, 0, -71.253076893999946, 44.26593523400004, 0, -71.253546915999948, 44.265360238000028, 0, -71.25419618899997, 44.265064935000055, 0, -71.254638356999976, 44.264768881000066, 0, -71.254693379999935, 44.264304002000074, 0, -71.254334208999978, 44.263837628000033, 0, -71.253897644999938, 44.263333768000052, 0, -71.253721255999949, 44.262644815000044, 0, -71.252945964999981, 44.262455978000048, 0, -71.251967330999946, 44.262276005000047, 0, -71.251034302999983, 44.261890945000061, 0, -71.250491086999943, 44.261833159000048, 0, -71.249455246999958, 44.261885189000054, 0, -71.248602321999954, 44.261696039000071, 0, -71.24793152899997, 44.261377330000073, 0, -71.248943055999973, 44.261101987000075, 0, -71.24987770499996, 44.260714735000079, 0, -71.250736520999965, 44.260066756000072, 0, -71.252226354999948, 44.257510893000074, 0, -71.253453175999937, 44.255015077000053, 0, -71.260123297999939, 44.258265536000067, 0, -71.260753630999943, 44.258148718000029, 0, -71.261763182999971, 44.258295173000079, 0, -71.262191127999984, 44.258701493000046, 0, -71.262625705999938, 44.259158697000032, 0, -71.263313174999951, 44.259386534000043, 0, -71.26437359099998, 44.25936646100007, 0, -71.265947386999983, 44.259345749000033, 0, -71.267387558999985, 44.259543721000057, 0, -71.268769318999944, 44.259748511000055, 0, -71.270245183999975, 44.259539335000056, 0, -71.271694854999964, 44.259558695000067, 0,
        -71.273243089999937, 44.259644947000027, 0, -71.273720269999956, 44.260134735000065, 0, -71.274150448999933, 44.260219556000038, 0, -71.274482574999979, 44.260101637000048, 0, -71.274717117999955, 44.259709543000042, 0, -71.275148480999974, 44.259615775000043, 0, -71.275612266999985, 44.259629270000062, 0, -71.275746691999984, 44.259343985000044, 0, -71.275633882999955, 44.258867360000067, 0, -71.276317750999965, 44.258167244000049, 0, -71.277546000999962, 44.257814255000028, 0, -71.278706799999952, 44.257639614000027, 0, -71.279747638999936, 44.25680972300006, 0, -71.280449012999952, 44.255954864000046, 0, -71.280040101999987, 44.255155778000073, 0, -71.279927967999981, 44.254572005000057, 0, -71.280162063999967, 44.254239428000062, 0, -71.282067044999962, 44.254245858000047, 0, -71.28385452699996, 44.254489982000052, 0, -71.285566809999978, 44.253555133000077, 0, -71.287523147999934, 44.253299711000068, 0, -71.289095585999974, 44.253495415000032, 0, -71.290728514999955, 44.253298398000027, 0, -71.294119881999961, 44.252728546000071, 0, -71.295054779999987, 44.252860125000041, 0, -71.295640836999951, 44.253209736000031, 0, -71.295836470999973, 44.253710424000076, 0, -71.296461756999975, 44.254379189000076, 0, -71.296725305999985, 44.254618163000032, 0, -71.297121527999934, 44.25483375400006, 0, -71.297981879999952, 44.25500321800007, 0, -71.298609282999962, 44.255338610000081, 0, -71.299069404999955, 44.255935391000037, 0, -71.300226628999951, 44.256320102000075, 0, -71.301049894999949, 44.257132348000027, 0, -71.301976850999949, 44.257254371000045, 0, -71.303561173999981, 44.258235710000065, 0, -71.305408301999933, 44.259009580000054, 0, -71.306300853999971, 44.25934576700007, 0, -71.306597073999967, 44.259759631000065, 0, -71.306956402999958, 44.260514621000027, 0, -71.307267667999952, 44.260915925000063, 0, -71.307612844999937, 44.261540602000025, 0, -71.307706886999938, 44.262421941000071, 0, -71.307269170999973, 44.263563539000074, 0, -71.307343187999948, 44.264120153000079, 0, -71.308141475999946, 44.265265509000074, 0, -71.308476943999949, 44.266380475000062, 0, -71.308230528999957, 44.267175355000063, 0, -71.307803621999938, 44.267853936000051, 0, -71.30806094199994, 44.268578064000053, 0, -71.307937507999952, 44.269011669000065, 0, -71.307491508999988, 44.269516592000059, 0, -71.307026515999951, 44.269833390000031, 0, -71.306843026999957, 44.270208938000053, 0, -71.306558249999966, 44.27068543200005, 0, -71.30589297299997, 44.270827997000026, 0, -71.305673054999943, 44.270855191000066, 0, -71.30428836599998, 44.26983920300006, 0, -71.303700645999982, 44.269677985000044, 0, -71.302719970999988, 44.269515956000077, 0, -71.302044730999967, 44.269627289000027, 0, -71.301651773999936, 44.269700610000029, 0, -71.301441575999945, 44.269896163000055, 0, -71.301312270999972, 44.270185882000078, 0, -71.301134691999948, 44.270870326000079, 0, -71.300955949999945, 44.271741588000054, 0, -71.300882520999949, 44.272401456000068, 0, -71.301019197999949, 44.272776718000046, 0, -71.302136815999972, 44.274198953000052, 0, -71.302343521999944, 44.274411343000054, 0, -71.302428732999942, 44.274648256000035, 0, -71.302390293999963, 44.275258417000032, 0, -71.302249613999948, 44.275581792000025, 0, -71.301831417999949, 44.275929190000056, 0, -71.300944086999948, 44.276449453000055, 0, -71.300422871999956, 44.276634604000037, 0, -71.299755739999966, 44.27701660300005, 0, -71.298682851999956, 44.27760898400004, 0, -71.298086106999961, 44.27793846000003, 0, -71.297744440999963, 44.278033374000074, 0, -71.297345876999941, 44.278007177000063, 0, -71.296965117999946, 44.27790630700008, 0, -71.29665425099995, 44.277718479000043, 0, -71.29639601599996, 44.277431183000033, 0, -71.295963411999935, 44.27730523200006, 0, -71.295495668999934, 44.277253894000069, 0, -71.29499255099995, 44.277314532000048, 0, -71.294017595999946, 44.277971458000025, 0, -71.293146631999946, 44.278628715000025, 0, -71.292850344999977, 44.278876842000045, 0]
    },
    "outlineColor": {
        "rgba": [50, 50, 50, 255]
    },
    "outline": true
},

}];

var dataSource = Cesium.CzmlDataSource.load(czml);
viewer.dataSources.add(dataSource);
viewer.zoomTo(dataSource);

``

“rgba” : [128, 128, 128, 1]

The alpha you’re using here is 1 on a 0-255 scale which means the color is nearly transparent. You probably intended to use 255.

Thank you, Scott