Rotate the bone using Quaternions until it is aligned with a Vector3 in Three.js

I am trying to align a bone with a specific Vector3 (directionToTarget) by rotating it. Here is the code snippet:

const directionToTarget = new THREE.Vector3(random, random, random); //random pseudocode values
directionToTarget.normalize();

var Hand2worldQ = new THREE.Quaternion();
this._anchor['LeftHandIndex1'].getWorldQuaternion(Hand2worldQ); // retrieves quaternion for LeftHand bone

this._mesh.skeleton.bones[ 0 ].quaternion.set( SomeFunctionThatMakesVecintoQuarternion(directionToTarget ); 
// applies rotation of LeftHand to _mesh skeleton bones

Currently, I am in search of a function called SomeFunctionThatMakesVec3intoQuarternion(directionToTarget )

javascriptthree.js

Answer №1

Object3D initially aligns with the 0, 0, 1 axis. You can utilize the Object3D.lookAt() method to adjust this object's orientation towards a specific target vector. Afterward, you can extract the resulting rotation for any further use:

// Create an abstract object facing the default direction
const obj = new THREE.Object3D();

// Rotate it to face the target coordinates
obj.lookAt(targetX, targetY, targetZ);

// Obtain the final rotation
const quaternion = obj.quaternion;
console.log(quaternion);

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