How can I retrieve the rotation values of an Object3D based on world axes like:
roation.x, rotation.y, rotation.z
Currently, when I use
object.rotation.x
I receive the rotation value relative to the object's local axes.
Appreciate any help!
How can I retrieve the rotation values of an Object3D based on world axes like:
roation.x, rotation.y, rotation.z
Currently, when I use
object.rotation.x
I receive the rotation value relative to the object's local axes.
Appreciate any help!
Apologies for resurrecting an old thread.
I encountered the same issue and was struggling to find a solution until I came across some enlightening ThreeJS documentation on Euler angles. Suddenly, everything made sense.
When working with Three.js, remember that it utilizes intrinsic (Tait-Bryan) ordering, which consists of yaw, pitch, and roll. This means rotations are executed in relation to the local coordinate system. For example, with order 'XYZ', the rotation occurs around world-X first, followed by local-Y (which may differ from the world Y-axis), and then local-Z (which might not align with the world Z-axis).
Some implementations use extrinsic (proper) ordering, where rotations are carried out relative to the world coordinate system. In this case, for order 'XYZ', the rotations happen around world-X, world-Y, and world-Z.
To convert between these two types, simply reverse the order and the rotation. Therefore, an intrinsic (Three.js) Euler rotation with angles a, b, c about XYZ is equivalent to an extrinsic Euler rotation with angles c, b, a about ZYX.
If you need to obtain the world rotations in XYZ order, you can try the following approach :
var worldRot = new THREE.Euler();
obj.getWorldRotation().copy(worldRot);
worldRot.reorder("ZYX");
// access worldRot.x, worldRot.y, worldRot.z
If you want to rotate an object on the world axis, you can achieve this by using the following function:
let rotationWorldMatrix;
function rotateOnWorldAxis(item, axis, angle)
{
rotationWorldMatrix = new THREE.Matrix4();
rotationWorldMatrix.makeRotationAxis(axis.normalize(), angle);
rotationWorldMatrix.multiplySelf(item.matrix);
item.matrix = rotationWorldMatrix;
item.rotation.getRotationFromMatrix(item.matrix, item.scale);
}
Simply call rotateOnWorldAxis(objectToRotate, new THREE.Vector3(1,0,0), 90 * Math.PI/180);
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