How can you effectively manage Click events within a three.js environment?

I'm working with a world map layer as a plane geometry and I need to handle click events on different parts, such as continents or countries. I want to show popup events on specific parts like information, videos, or image data with links. How can I achieve this?

Check out this fiddle that already has the scene set up.

var camera, scene, renderer;
var geometry, material, mesh;

window.addEventListener("click", onClick, false);

function onClick() {
    alert("Replace me with code to add an object!");
}

var init = function () {
    // initialization code here
}

var animate = function () {
    // animation code here
}

init();
animate();

The click event is currently applied to the whole scene, so when you click on any part, the same click event is triggered for all parts. You need to figure out how to handle click events on specific parts of the map.

Answer №1

The question posed is quite intricate, requiring a more simplified approach. The initial issue to tackle is identifying the specific object that is being clicked on.

There are two common methods for achieving this: raycasting and GPU picking. Given your novice status, I recommend starting with raycasting as it is more beginner-friendly.

Answer №2

To accurately determine the location on a map where a click occurred, there are several steps you can take (one method being the use of GPU-picking as an alternative approach):

  • Utilize the raycaster provided by three.js to obtain details about the object positioned under the cursor at the time of the click event. (docs/example)
  • From the raycaster output, extract the uv-coordinates indicating the intersection point (i.e., where the click happened on the map texture).
  • Subsequently, either represent your geographic elements based on these UV-coordinates or convert the UV-values into a geographical format (such as WGS84 or latitude/longitude) compatible with your map's projection method (likely a mercator-projection). Numerous conversion libraries are accessible for this purpose.

Now equipped with the knowledge of the click's location on your map, you can evaluate it against geographic features, such as continents. Define a polygon for each continent within the same coordinate system as the click's coordinates. Perform a 'point in polygon' test (implementation available here) to determine if the clicked position falls within the specific continent's boundaries.

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