Javascript object property not updating on variable set

Question

I am working with a Three.js Quaternion and I am having trouble saving my object's property for the Quaternion.

GLmol.prototype.initializeScene = function() {
   this.scene = new THREE.Scene();
   this.scene.fog = new THREE.Fog(this.bgColor, 100, 200);

   this.modelGroup = new THREE.Object3D();
   this.rotationGroup = new THREE.Object3D();
   this.rotationGroup.useQuaternion = true;

   this.rotationGroup.quaternion = new THREE.Quaternion(0.7235552851867599, -0.004228243257681183 , 0.004646778667168487, 0.6902378421133389);
   console.log(this.rotationGroup.quaternion)

   this.rotationGroup.add(this.modelGroup);

   this.scene.add(this.rotationGroup);
   this.setupLights(this.scene);
};

The problem I am getting is that when I set the this.rotationGroup.quaternion = new THREE.Quaternion(), it doesn't save the Quaternion object. When I look at the output I get

THREE.Quaternion (w:1 x:0 y:0 z:0)

Why do you think this is happening?

Yes, It is called because I get the output from console.log(this.rotationGroup.quaternion), however its not the value that was set in the line right before. — Kyle
– Kyle, Commented Apr 15, 2017 at 17:28
Also, If I make a variable called, var test = new THREE.Quaternion(3, 3, 3, 3), and console.log(test) it works properly. — Kyle
– Kyle, Commented Apr 15, 2017 at 17:29

Community · Accepted Answer · 2017-05-23 12:17:39Z

1

The Object3D.quaternion property is immutable, so this code is invalid:

rotationGroup.quaternion = new THREE.Quaternion( x, y, z, w );

Instead, use .quaternion.copy( q ) or .quaternion.set( x, y, z, w ).

Also see this answer.

three.js r.84

edited May 23, 2017 at 12:17

CommunityBot

11 silver badge

answered Apr 15, 2017 at 19:29

WestLangley

105k11 gold badges288 silver badges285 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Kyle Over a year ago

Thank you, I used set and everything works properly. I am modifying code and they tried the way I did, however, it was actually set earlier in code and the line I was copying did nothing. Thank you.

Collectives™ on Stack Overflow

Javascript object property not updating on variable set

1 Answer 1

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related