Can anyone shed some light on this issue I'm having while attempting to set vertices of a geometry using a quaternion? The code snippet I've been using is:
geometry.attributes.position.array[x].applyQuaternion(quaternion)
However, it doesn't seem to be working as expected. I am aware that there have been changes in the implementation in the past and I suspect that the problem lies in the fact that
geometry.vertices[x]
is no longer accessible. Any insights on this?
The function .applyQuaternion() can only be used with a Vector3 object, not with a simple number. Trying to use 7.applyQuaternion() on a number is invalid because it doesn't make sense to apply a 3D rotation to a 1-dimensional value.
To solve this issue, ensure that you first create a Vector3 using the XYZ coordinates of the vertex you want to manipulate by utilizing the BufferAttribute.get... method:
// Create quaternion
const quat = new THREE.Quaternion();
quat.setFromAxisAngle( /* ... */ );
// Get position attribute
const posAttrib = geometry.getAttribute('position');
// Obtain the XYZ components of the 7th vertex in the geometry
const twistVec = new THREE.Vector3(
posAttrib.getX(7),
posAttrib.getY(7),
posAttrib.getZ(7)
);
// Now that you have a Vec3, you are able to apply a quaternion
twistVec.applyQuaternion(quat);
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