Begin by generating lines and text that originate from the center of spherical objects in ThreeJS

Question

Begin by generating lines and text that originate from the center of spherical objects in ThreeJS

Currently, I am constructing a solar system simulation using ThreeJS. As part of the functionality, when I select a planet's name, the camera zooms in on that specific planet. My goal now is to create a visual element that consists of a 2D line originating from the center of the planet and extending towards some text displaying relevant information such as mass, speed, etc.

Could you provide guidance on how to implement this feature successfully?

javascript three.js

Answer 1

Answer №1

Typically, finding the center of a spherical mesh is achieved by accessing its position property. The label's position can be determined either through calculations (such as using the sphere's AABB) or by pre-defining it. In both scenarios, you will have at least two points that can be utilized to create a line setup like this:

const points = [ spherePosition, labelPosition ]; // instances of Vector3

const geometry = new THREE.BufferGeometry().setFromPoints( points );
const material = new THREE.LineBasicMaterial( { color: 0xff0000 } );

const line = new THREE.Line( geometry, material );
scene.add( line );

Answer 2

Typically, finding the center of a spherical mesh is achieved by accessing its position property. The label's position can be determined either through calculations (such as using the sphere's AABB) or by pre-defining it. In both scenarios, you will have at least two points that can be utilized to create a line setup like this:

const points = [ spherePosition, labelPosition ]; // instances of Vector3

const geometry = new THREE.BufferGeometry().setFromPoints( points );
const material = new THREE.LineBasicMaterial( { color: 0xff0000 } );

const line = new THREE.Line( geometry, material );
scene.add( line );

Begin by generating lines and text that originate from the center of spherical objects in ThreeJS

Answer №1

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