The instructions in this article are applicable only if you want to tinker with the LuciadRIA sample code yourself.

To start the LuciadRIA samples as they come in the release, without modification, start the sample server with the startSampleServer script, and go to Samples to select and launch samples.

Quick overview

  1. Make sure your system setup covers all prerequisites, as described in the Hardware and software requirements.

  2. Extract the LuciadRIA release correctly, following the installation instructions.

  3. Run npm install in the root of the LuciadRIA distribution.
    This command installs all sample dependencies. You must install these once for a release. See Installing dependencies.

  4. Start the sample server with the startSampleServer script in the root of the LuciadRIA distribution. See Running the sample server for more information.

  5. Run npm run dev in the directory of the sample you want to edit and run.
    A browser window opens automatically. It runs your sample and watches the files in that directory. If you edit and save a file in that directory, the running sample changes automatically, and the browser window refreshes. See Running a webpack dev-server for a sample.

Installing dependencies

Before you can deploy the samples in the samples/ directory, you must install all dependencies of the LuciadRIA distribution and its individual samples. To install the dependencies, you must execute npm install in the root of the LuciadRIA distribution. This command installs all development dependencies declared in the root package.json and the ones declared in the package.json of the workspaces that are defined. The NPM workspaces also take care of dependency hoisting: dependencies that are common to different samples are only installed once in a higher-level node_modules directory.

After installing the dependencies of all samples, you can set up your web application.

Running the sample server

Several samples don’t fetch their data locally, but request it from a server, or use other data services. The LuciadRIA distribution offers a sample server to host those services. You can run the sample server by executing the startSampleServer script. http://localhost:8072 hosts the server by default.

Running a webpack dev-server for a sample

When you’re developing an application, it’s useful to run a development server, or dev-server. A development server serves the application and watches the source files for changes. It serves those changes without a server restart. To start a webpack dev-server for a sample application in the LuciadRIA distribution:

  1. Make sure that you have bootstrapped the sample dependencies, as explained in Installing dependencies.

  2. Go to the samples/ directory and execute npm run dev.
    By default, a dev-server starts hosting the First Sample on http://localhost:3001/. It also watches the bundled files so that it can pick up and serve any changes in the source code or styling as long as it’s running.

You can also add arguments to npm run dev by adding -- and one or more argument tags at the end:


Specify the port on which the webpack dev-server must run.

--env isWebGL

Set this argument to run the sample using a WebGL map.

--env is3D

Set this argument to run the sample using a 3D WebGL map.

--env sampleServerUrl=<URL>

Specify the URL and port on which the sample server is running.

For example, if you want to run on port 3002, you run the following command:

npm run dev -- --port=3002

Make sure to insert the double dashes -- before the argument --. They tell npm to pass the next arguments down to the webpack dev-server.

The webpack configuration file of all samples extends from samples/common/config/webpack.config.js. See the webpack configuration web page for more information.

Building and running the sample

Building and running samples may require a significant amount of memory.To execute the build, you need to configure the amount of memory that Node.js can use.You can do so by setting the NODE_OPTIONS environment variable to --max-old-space-size=4096.

To build and run the application, take these steps:

  1. Run the npm run build command in the sample directory.
    The sample is packaged to packed-samples/ria/<sample>.

    The original sample in that directory will be overwritten, so it might be a good idea to back that up first.

  2. Start the sample server by running the startSampleServer script.

  3. Open your browser, and point it to http://localhost:8072/samples/<sample>. A new web page displays your application.

This uses the same webpack configuration file as discussed in Running a webpack dev-server for a sample.

When you’re deploying a real application, just running the provided webpack dev-server isn’t enough. You must take care of other steps, such as minification/uglification or chunk splitting as well, before you can serve the application.

Transpiling TypeScript samples to JavaScript

Some samples contain TypeScript code. To re-use sample code in a JavaScript project, you can automatically convert the TypeScript code to JavaScript. You can do this by running npm run transpile-to-js in the sample directory. This command generates a ./transpiled directory inside the sample. This folder contains a full copy of the sample source code, but with TypeScript transpiled down to JavaScript. Optionally, you can also generate TypeScript declaration files (.d.ts files) in the transpiled directory by running npm run transpile-declarations in the sample directory. Even when you’re not using TypeScript, these files give code completion hints to your IDE about the corresponding JavaScript files.

Use of React in LuciadRIA samples

The UI components in the LuciadRIA samples have been implemented with React. We use React in our sample code because it’s a very popular UI library.

Note that you don’t have to use React with LuciadRIA. You’re free to use any UI library you want. Even if you’re using a different UI library, such as Angular or Vue, you can still use the sample code as inspiration for your own UI components.

Finding React components in the sample structure

You can find the React UI components in the components directory of a sample. To find components that are re-used across samples, see the samples/common directory, also known as the @luciad/ria-sample-common NPM package.

Sample code highlights


This folder contains React UI elements that are used across LuciadRIA samples.


This folder contains configuration shared across LuciadRIA samples, like Typescript or Webpack configuration files.


This folder contains utility functions shared across LuciadRIA samples.


A container for a LuciadRIA Map. It renders a <div/> element and creates a Map instance with that element.


A sample based on a single map that covers the entire window. It has a SampleMap, overlay components, and a placeholder for UI below the map, such as the bottomBar property. Most LuciadRIA samples are based on this component.


A sample based on 2 maps that cover the entire window. It has 2 SampleMap components, each with its own overlay components.


This folder contains a bunch of overlay components, such as a layer tree UI, a mouse location components, a scale indicator, and navigation controls.


This file contains CSS variables and common styles that all LuciadRIA samples use.