These days we all know about computer generated imagery. In fact many of us think that the Star Wars prequels had way too much of it and suffered because of this. Star Trek has always been a pioneer of the art-form and as such has helped shape the technology behind it. These videos are from a 1987 Open University documentary on computer aided design, highlighting some early examples of CGI and how it was used in Star Trek.
Both are well worth your time. It’s a fascinating look back at effects that we take for granted today. The first video looks at Star Trek IV: The Voyage Home. The second video looks at some of the work done on the Genesis Device sequence from Star Trek II.