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?
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?
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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