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Which is rotation equivalent to a quaternion rotation?


Asked by Alina Rodriguez on Dec 11, 2021 FAQ



Using quaternion as rotations. A visualization of a rotation represented by an Euler axis and angle. In 3-dimensional space, according to Euler's rotation theorem, any rotation or sequence of rotations of a rigid body or coordinate system about a fixed point is equivalent to a single rotation by a given angle. θ.
In this manner,
So essentially quaternions store a rotation axis and a rotation angle, in a way that makes combining rotations easy. This format is definitely less intuitive than Euler angles, but it’s still readable: the xyz components match roughly the rotation axis, and w is the acos of the rotation angle (divided by 2).
In respect to this, A quaternion is a set of 4 numbers, [x y z w], which represents rotations the following way: RotationAxis is, as its name implies, the axis around which you want to make your rotation. RotationAngle is the angle of rotation around this axis.
Accordingly,
Quaternions are often used instead of Euler angle rotation matrices because “compared to rotation matrices they are more compact, more numerically stable, and more efficient” (Source: Wikipedia ). Note that a quaternion describes just the rotation of a coordinate frame (i.e. some object in 3D space) about an arbitrary axis, ...
Similarly,
The quaternion that computes this rotation is You may want to confirm that q is a unit quaternion, since that will allow us to use the fact that the inverse of q is q' if q is a unit quaternion. Suppose we want to perform two rotations on an object.