@blueglass said:
My plan was to edit so that viewers would have the option of showing the names of the polyhedra (in the closed caption), but to have music rather than my voice for the sound track. Do you know how hard that would be with fraps?
Adding music is easy with a free software like 'Windows Live Movie Maker' or 'iMovie'. I know that fraps record internal sounds so playing a music while recording might be another way. Also a reason to use 'Windows Live Movie Maker' is to reduce the file size since the video 'Fraps' export is very high in size but doing this is very easy to do.
@blueglass said:
I would like to understand better why the quality goes down with what I'm doing,
Not so sure about this but let me point out that maybe it is the codec the video player use to display the animation. I for example used SimFonIA Animation Tools to export animations videos and while playing the exported video with 'VLC' video player I was getting significantly better resolution than playing the same video with 'Windows Media Player'. Regardless the animation looked way better inside SketchUp so using Fraps might be better, although if the machine can't handle real time playback because of the complexity then 'Fraps' is not an option.
Here is a video where I used 'Fraps' to record everything except when I show the animations because I used the export option from within Sketchup. Notice the diference in quality...Hope this shows that screen capturing might return better resolution.
You said you use 'Cam Studio' and that is fine if you are not recording real time animations because it might cause heavy video lag. That is why I recommended Fraps because it specifically designed to record CPU intensive playbacks as games and things like that. Note that 'Fraps' only records the view port window so it ignores anything else like the menus and stuff like that so it might be handy to keep 'Cam Studio' if capturing menus is necessary.
By the way it is really cool that a teacher is thinking outside the box to make learning fun! 