How come the rotation of my Three.js mesh gets thrown off when I adjust the scale?

I managed to achieve my goal of rotating a sphere around the x and y axes using the following code:

// Update ball rotation.
var tempMat = new THREE.Matrix4();
tempMat.makeRotationAxis(new THREE.Vector3(0,1,0), stepX/ballRadius);
tempMat.multiplySelf(ballMesh.matrix);
ballMesh.matrix = tempMat;
tempMat = new THREE.Matrix4();
tempMat.makeRotationAxis(new THREE.Vector3(1,0,0), -stepY/ballRadius);
tempMat.multiplySelf(ballMesh.matrix);
ballMesh.matrix = tempMat;
ballMesh.rotation.getRotationFromMatrix(ballMesh.matrix);

However, when I adjust the scale of the ballMesh to anything other than (1,1,1), the rotations become erratic in a way that is challenging to explain. You can see an example of this behavior in this jsfiddle:

http://jsfiddle.net/pxTTv/26/ (use the arrow keys to rotate)

Returning the scale (as shown in the jsfiddle code) to (1,1,1) resolves the issue and it rotates as expected.

I am curious to know what is causing this and how I can address it?

javascriptmatrixwebglthree.jsrotational-matrices

Answer №1

Don't forget to include the scale argument when calling 

vector.getRotationFromMatrix( matrix, scale )
.

It's important to avoid manipulating the object matrix directly unless you are confident in your actions. Instead, adjust the object's rotation, position, and scale and let the library handle the matrix update.

Although you were unintentionally overwriting the object's matrix, it was luckily being recalculated during the render call in your scenario.

For a corrected example, refer to this fiddle: http://jsfiddle.net/pxTTv/27/

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