[quake3] feature: advanced demo navigation

[Neil Toronto]

These are called "Multi-View Demos" and (IIRC) OSP mod was the first to 
do them. (CPMA and Ultra Freeze Tag (mine) did it, along with probably a 
few more.) It consists of three parts:

1) Send *every* entity to the player taking the MVD, not just those in 
the PVS (potentially visible set)
2) Mark the demo as an MVD by setting a configstring
3) Enable the cgame keycatcher when playing demos back if playing an 
MVD, interpret keystrokes

This can be as easily done in a mod as in the engine. If the engine did 
it, it would do basically the same thing. One good argument for doing it 
in a mod is that the mod can better control who is allowed to make an 
MVD. Recording an MVD is a great way to maximize the effectiveness of a 
wall hack.

Neil

Jorge Pena wrote:
> Sweet. I don't know if this is possible, or realistic, but what Monk 
> said about being able to view a demo and move the camera around in the 
> world (Is this what you meant?) would be extremely crazy ( As in, 
> cool). Or is this already possible? Heh. I mean like, instead of 
> having to stage the cameras at record time, make it so that the camera 
> could be moved around in view-time, this way I think it'd make for 
> some really neat videos and it'd be really useful. Imagine moving the 
> camera around to see if someone's around the corner, etc., instead of 
> just being stuck to the recorder's perspective. Again, I don't know if 
> this is possible or realistic ( Or already implemented, haha), just 
> thought it'd be cool.