What is the best way to position and align an angle with the axis of a moving 3D figure?

My latest project involves a rotating planet, specifically Saturn with its iconic rings. To capture the best view of this celestial marvel, I configured the camera with precision:

  var camera = new THREE.PerspectiveCamera(45, width / height, 0.05, 1000);
  camera.position.z = 3;
  camera.position.y = 1;
  camera.position.x = 1;

Despite my efforts, the current setup only presents the planet from a fixed angle on a flat x-y-z axis.

You can see how it looks in action here: Saturn & Rings

I'm keen to incorporate a visual aid by drawing a dashed or dotted line outlining the true axis of the planet, set at an angle 'Ɵ' relative to the orthogonal solar plane (assuming the solar-plane is aligned with 'x-z'). Additionally, I am intrigued by tweaking the angle of the default axes (XYZ) assigned to the planet. How can I achieve this?

javascript3dthree.js

Answer №1

To spin your planetary form on a specific axis, employ a code snippet such as the one below:

planet = new THREE.Mesh( structure, surface );
space.add( planet );

planet.add( new THREE.AxisHelper( 10 ) ); // display the local coordinate system

planet.rotation.set( 0, 0, - Math.PI / 8 ); // establish initial positioning

Subsequently, within your animation loop,

planet.rotateY( 0.01 ); // rotate planet along its Y-axis

Based on three.js r.71

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