Objects become visible over a sphere only when they are positioned behind it

I am currently working on a project to create a dynamic rotating globe with points of interest marked on it. The globe rotates, and I want the points of interest to be visible whenever they are in view.

However, I am facing an issue where the points of interest only appear when they are "behind" the globe during rotation, as shown in the image below (only a thin red line is visible on the right):

https://i.sstatic.net/4Vrzw.png

Below is the code snippet:

<script setup>
import * as THREE from 'three';

const points = [
  {
    name: 'Paris',
    latitude: 48.864716,
    longitude: 2.349014,
  },
  {
    name: 'New York',
    latitude: 40.73061,
    longitude: -73.935242,
  },
  {
    name: 'Beijing',
    latitude: 39.9042,
    longitude: 116.407396,
  },
];

// Remaining code snippet goes here...

If you want to see a live demonstration of the issue, you can visit this Stackblitz link: https://stackblitz.com/edit/nuxt-starter-ewsydq?file=app.vue. I have stripped down unnecessary elements to keep the reproduction as lightweight as possible.

Your assistance in resolving this issue would be greatly appreciated. How can I ensure that the points of interest are visible when they are on the side of the globe facing the viewer?

Answer №1

After some investigation, I finally figured out what was causing the issue. It turns out that I had only added the material to one side of my marker.

I realized that I needed to apply the material to both sides, so now the side of the marker that is displayed above the globe also has the material.

const marker = new THREE.Mesh(
    new THREE.RingGeometry(0.01, 0.02, 32),
    new THREE.MeshBasicMaterial({
        color: 0xFF0000,
        side: THREE.DoubleSide,
    })
)

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