Set this matrix to a spherical billboard transformation that rotates the local +Z axis of a given object with position <code>objPos</code> towards
a target position at <code>targetPos</code> using a shortest arc rotation by not preserving any <i>up</i> vector of the object.
<p>
This method can be used to create the complete model transformation for a given object, including the translation of the object to
its position <code>objPos</code>.
<p>
In order to specify an <i>up</i> vector which needs to be maintained when rotating the +Z axis of the object,
use {@link #billboardSpherical(ref Vector3d, Vector3d, Vector3d)}.
@param objPos
the position of the object to rotate towards <code>targetPos</code>
@param targetPos
the position of the target (for example the camera) towards which to rotate the object
@return this
Set this matrix to a spherical billboard transformation that rotates the local +Z axis of a given object with position <code>objPos</code> towards a target position at <code>targetPos</code> using a shortest arc rotation by not preserving any <i>up</i> vector of the object. <p> This method can be used to create the complete model transformation for a given object, including the translation of the object to its position <code>objPos</code>. <p> In order to specify an <i>up</i> vector which needs to be maintained when rotating the +Z axis of the object, use {@link #billboardSpherical(ref Vector3d, Vector3d, Vector3d)}.
@see #billboardSpherical(ref Vector3d, Vector3d, Vector3d)
@param objPos the position of the object to rotate towards <code>targetPos</code> @param targetPos the position of the target (for example the camera) towards which to rotate the object @return this