To view imagery or elevation data in a LuciadRIA hardware-accelerated map, the application client must be allowed to access server data. This is a restriction of WebGL.
Enable Cross-Origin Resource Sharing (CORS) on the server of the service. CORS allows you to configure what domains can have applications that access your data.
For example, Bing Maps allows the use of its tiles in applications hosted by any server.
Serve the tiles on the server that also serves the application. You can deploy them on the same application server, for example.