How to tile Mars themis raster for Cesium

[semper]

Hi Omar,

Thank you so much for getting back to me. We wish to utilize the Ion offering further down the road once we have a working prototype.

I have now projected the original raster to EPSG4326 and applied --profile mercator while tiling. Based on your suggestions, I now instantiate the Cesium.Viewer as follows:

var ellipsoid = new Cesium.Ellipsoid(3396190,3396190,3396190);

Cesium.Ellipsoid.WGS84 = ellipsoid;
var mapProjection = new Cesium.GeographicProjection(ellipsoid);

var globe = new Cesium.Globe(ellipsoid);
globe.showGroundAtmosphere = false; // necessary for tiles to show in non-earth ellipsoid
globe.depthTestAgainstTerrain = true;

var opts = {
    mapProjection: mapProjection,
    globe: globe,
    skyAtmosphere: false,
 
    imageryProvider: new Cesium.createTileMapServiceImageryProvider({
       url : 'http://localhost:8080/epsg4326',
       fileExtension : 'png',
       ellipsoid: ellipsoid
    }),
};

Cesium now recognizes the tiles, however, there are holes at the poles, which is not unexpected. Is there a way to extend the coverage further toward the poles? I also see a blue streak – likely at 0 longitude – that I am not too sure how to get rid of.
Any tips to resolve these issues would be fantastic and thank you so much again for your help.

Cheers,
Rakib