Zero Length Strings

AKA the Killtarget bug. This one came up during Map Jam 7, and it’s a bug which affects classic Quake and Quoth alike (note to future readers, if Quoth is past version 2.2 then this is no longer the case…). It manifests itself when a rogue entity deletes everything on the map without a targetname – including the player! This is obviously a showstopper, but to understand why it happens we need to explore a subtle detail of the QuakeC language.
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Missing items and the restart command

Quake doesn’t give mappers direct control over the items a player starts with. If you want the player to have a nailgun from the moment the level starts, overlapping the weapon with the spawn point seems like a good idea. Most of the time the player picks up the weapon immediately and all is well, but a bug occurs if the player uses the restart command to load the level from the beginning – the item falls out of the level! This article takes a brief look at why, and then suggests how to modify the QuakeC code to work around it. Continue reading