The pig head has some rotational movement from position A to B as shown in my attached pic.

(Pivot point remains at {0,0,0} with no translation or rotation)




In order to the get the degrees for such rotation, I have the following:



// Method 1. Matrix only:
matrix3 offset = invert(A) * B;
vector Rot = cracktransform(0, 0, 1, 0, offset);


// Method 2. Convert to quaternions for calculation:
vector4 A = quaternion(A);
vector4 B = quaternion(B);
vector4 offsetQ = qmultiply(A, qinvert(B));
vector Rot = qconvert(offsetQ);



I was expecting the same result for Rot, unfortunately not.

There must be something somewhere I misunderstood. Someone explain to this noob, please?

qconvert() returns an angle/axis vector, where the vector's direction is the axis and the magnitude is the rotation around that axis

You might be looking for quaterniontoeuler() instead?

I am perplexed.