Hi,i recently fought a old face texture of odell called face.vtf.
Maybe of the hyperborea era like 1999 or 2000.
and i asked myself
did odell or other characters used the goldSRC mouth movement or the Source mouth movement?
that's all.
(sorry my bad english)
Hey! No worries, your english is fine.
The source engine was branched off as soon as hl2 starte development. They took the goldsrc engine, unnamed at the time, and branched it in two, one being the 'src' branch. This was built upon with more features over time, becoming our modern Source engine, so it's a little bit off to call periods of hl2's engine 'goldsrc' or 'source', as it was based in goldsrc and updated from the start.
The old odell face was the face Odell used when his character was first created - think the odell low quality odell lines. According to Marc Laidlaw, the facial animation system used in Source was developed around the same time these lines were recorded - late 1999/early 2000. This is backed up by the presence of Phenomes imbedded in the sound file, which allows the character to lip sync. So, this Odell would have used the hl2 mouth movement system rather than HL1's. I hope this answers your question!