Spherically interpolates between from and to by t.
Interpolate between fromQuaternion and toQuaternion by this amount. Value is clamped to 0-1 range. 0 = fromQuaternion; 1 = toQuaternion; 0.5 = half way between.
Store the result in this quaternion variable.
Repeat every frame. Useful if any of the values are changing. SHOULD BE ALWAYS TRUE