Converting rotation into a directional vector

I have a Three.js object and I am able to read its rotation. However, I am looking for a way to extract a vec3 that indicates the direction in which the object is currently rotated. Can someone provide guidance on how to achieve this?

Answer №1

In THREEJS, quaternions are used instead of rotating around X, Y, Z in a specific order. One can break down quaternion axis like so:

function extractQuaternion(q: THREE.Quaternion) {
if (q.w > 1) {
    q.normalize(); 
}

const angle = 2 * Math.acos(q.w);
const s = Math.sqrt(1 - q.w * q.w); 
const axis = new THREE.Vector3();
if (s < 0.001) { 
    axis.set(q.x, q.y, q.z); 
} else { 
    axis.set(q.x / s, q.y / s, q.z / s)
}

return {
    axis,
    angle
};
}

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