not the first but a good example is this one >
https://www.youtube.com/watch?v=nbGB8odsLJ0&feature=youtu.be&t=280
(the above is in a code tag because the forum drops the timestamps when changing it to media tag)
it has pixel morph between 2 3D states
and the glenz vector is pure 3D coordinate morphing
also do a search for ultraforce vector demo (PC) which has some interesting things like fast filled & stencil vectors, bobs and mixtures of all of it.
also on Amiga there were a lot of examples but I can't recall the demo names. (it's been a while
)